In this article, we’ll explore the fundamentals of Electronic Speed Controllers (ESCs) and their role in FPV drones. This comprehensive guide aims to provide valuable information such as voltage ratings, current ratings, benefits of different ESC types, and the anatomy of an ESC. Let’s get started!
Table of Contents
What is an ESC?
An ESC, or Electronic Speed Controller, is responsible for controlling the speed of motors in an FPV drone. The ESC receives throttle signals from the flight controller and drives the brushless motor at the desired speed. Utilizing high-quality ESCs leads to a reliable and smooth flight experience, although many other factors also play a role in the overall performance.
ESCs are a crucial part of drone performance, as they are responsible for controlling the variable speed of motors. They’re powered by direct current (DC) from your LiPo battery and take motor signals from the flight controller, providing three-phase alternating current to power the motor.
ESC Recommendations
Opting for a complete FC/ESC stack can simplify the building process, as it’s plug-and-play. This approach minimizes the need to worry about wiring compatibility between different manufacturers. Check out my recommended flight controller stacks here: https://oscarliang.com/top-5-best-fc-mini-quad/
For those who prefer to purchase ESCs separately, consider the following recommendations.
When using a 4-in-1 ESC and flight controller from different brands, it’s crucial to verify the pinout before connecting them to prevent potential damage to the components. Always inspect and adjust the wires in the harness as needed prior to connecting.
Top of the Line
Holybro Tekko32 F4 65A
You can get the Tekko32 F4 ESC from these vendors:
- GetFPV: https://oscarliang.com/product-2lkt
- AliExpress: https://s.click.aliexpress.com/e/_DeSQDZX
- RDQ: https://oscarliang.com/product-onoj
- Amazon: https://amzn.to/346eCJh
The Holybro Tekko32 F4 65A is possibly the most robust and lowest noise ESC available, thanks to its impressive onboard noise filtering. You’ll be amazed by the clean power this ESC delivers. Utilizing one of the most powerful F4 processors in ESC, the Tekko32 is rated for 65A with an 85A burst current. It’s an absolute powerhouse for both 4S and 6S freestyle and racing builds. For more details, check out my review: https://oscarliang.com/holybro-kakute-h7-bt-fc-tekko32-f4-50a-65a-esc/
Mid-Tier ESC
XRotor Micro 60A
You can find the XRotor G2 65A ESC from these vendors:
- AliExpress: https://s.click.aliexpress.com/e/_DlMl6hJ
- RDQ: https://oscarliang.com/product-eczg
- Amazon: https://amzn.to/3TR72b1
- GetFPV: https://oscarliang.com/product-09w6
Purchase the XRotor G2 45A ESC here:
- AliExpress: https://s.click.aliexpress.com/e/_DB9wUEv
The Hobbywing XRotor G2 45A/65A are one of the most recognizable 4in1 ESCs in the industry, endorsed by numerous top pilots. This feature-rich ESC offers DShot and dynamic 120kHz PWM frequency support, robust FETs, direct pins for a low ESR capacitor, and the option to use either a connector for a plug-and-play setup or direct soldering to the flight controller. If budget isn’t a concern, this ESC is a strong contender to consider. Read more here: https://oscarliang.com/hobbywing-xrotor-g2-4in1-esc-45a-65a/
Cheapest Worth Having
SpeedyBee BLHeli_S 50A
You can get the SpeedyBee 50A ESC from these vendors:
- AliExpress: https://s.click.aliexpress.com/e/_DlAHDLb
- Amazon: https://amzn.to/3KieBEn
- GetFPV: https://oscarliang.com/product-hdll
- RDQ: https://oscarliang.com/product-j8vu
- Speedybee: https://oscarliang.com/product-clau
At just over $40, the SpeedyBee BLHeli_S 50A 4in1 is one of the most affordable 4in1 ESCs on the market, offering reliable and decent performance. I’ve personally tested this ESC and have been flying it for over a year. It’s still going strong and performing well. You should seriously consider purchasing this ESC with the SpeedyBee F4 V3 FC as a stack. Together, they cost under $70, making it one of the best value stacks available in 2023. For more details, see my review: https://oscarliang.com/speedybee-f405-v3/
The Best 20x20mm ESC
20x20mm ESCs are smaller and lighter but not as reliable as 30x30mm ESCs due to the larger MOSFETs on the latter. Additionally, soldering is easier on 30x30mm ESCs thanks to larger solder pads. Choose 30x30mm ESCs whenever possible; however, for lightweight racing drones or smaller drones, 20x20mm is a popular option.
Aikon AK32PRO 50A V2
You can get the Aikon AK32PRO 4in1 ESC from these vendors:
- AliExpress: https://s.click.aliexpress.com/e/_DeDfP5P
- RDQ: https://oscarliang.com/product-id38
- GetFPV: https://oscarliang.com/product-o7t9
Despite their compact form factor (20x20mm mounting holes), these ESCs offer performance similar to some 30x30mm boards, with a 50A current rating per motor output and support for up to 6S. They’re small enough to fit in 3″ builds. If you ever need a 20x20mm 4in1 ESC for even a lightweight 5″ build, this is an excellent choice also.
The Best Single ESC
Aikon AK32 35A ESC
You can find the Aikon AK32 35A ESC from these vendors:
- AliExpress: https://s.click.aliexpress.com/e/_DDvLwrJ
- GetFPV: http://bit.ly/2F8TLqh
- Amazon: https://amzn.to/32nKnKK
While I personally prefer 4in1 ESCs due to their ease of use, you may have reasons to choose individual ESCs. In that case, I recommend the AK32 35A ESC by Aikon. I’ve used these ESCs on a build for a couple of years without any issues, and they offer excellent reliability and performance. These are straightforward BLHeli_32 ESCs without fancy RGB LEDs, rated for 2S to 6S voltage, with a burst current rating of up to 45A.
The Types of ESC
There are two main types of ESCs: 4-in-1 ESC and single ESC.
4in1 ESC
A 4-in-1 ESC integrates four individual ESCs onto a single circuit board, each controlling a separate motor.
Typically, 4in1 ESCs are the same size as the flight controller, which allows for easy stacking and streamlined installation. With fewer solder joints, they require less soldering and wiring. The 4in1 ESC usually sits beneath the flight controller and connects via a single wire harness. However, if one ESC is damaged, you’ll need to replace the entire board—a trade-off between risk and convenience. However, 4in1 ESC these days are very reliable so it’s generally not something to be concerned about.
Additionally, 4-in-1 ESCs offer better weight distribution due to their centralized mass, which can enhance the drone’s responsiveness.
Three 4in1 ESC sizes are available based on mounting patterns for different drone sizes: 30x30mm, 20x20mm, and 16x16mm. Larger ESCs are typically more durable and powerful, thanks to their larger FETs. For 5″ and larger FPV drones, 30x30mm is the most common.
Single ESC
Single ESCs control only one motor and were more popular in the past but have become less common in recent years.
The primary benefit of single ESCs is their ease-of-use and cost-effectiveness when it comes to replacement, as they can be swapped individually if damaged. Since they’re usually mounted on the arms, they receive more airflow and have better cooling capabilities.
When using individual ESCs, they typically need to be connected to a single power distribution board (PDB) or an “AIO flight controller” (a type of flight controller with integrated PDB) for power supply.
However, individual ESCs do have some drawbacks, such as more soldering and wiring, which can also result in a heavier drone due to the added weight of wires and power distribution board.
Determining ESC Requirements
To select the appropriate ESC for your FPV drone, ensure that the ESC is compatible with your battery’s voltage and can handle the current draw of your chosen motor and propeller.
Voltage Ratings
Verify that your ESCs support the voltage of your battery. Using a battery voltage that’s too high for your ESC can cause damage. Some ESCs support input voltages up to 6S, while others only support up to 4S or lower. The terms 6S and 4S refer to the cell count in your LiPo battery. If you’re unfamiliar with these terms, please refer to my LiPo battery beginner guide: https://oscarliang.com/lipo-battery-guide/#Cell-Count
Current Ratings
ESC current rating is measured in Amps and is sometimes called “amp rating.” It indicates the maximum current an ESC can handle without damage. Keep in mind that this is not the amount of current pushed to the motors, so don’t worry about it being “too large.” An amp rating can never be too high, only too low.
For the typical FPV drone pilot, the amp rating on most ESCs is more than sufficient. If you are building a specialized racing drone that requires extreme performance or high-speed runs, you will need to pay close attention to the ESC amp rating, along with other factors. However, under normal use, most pilots do not push their batteries hard enough to exceed the current rating of their ESCs.
There are two current ratings for an ESC: continuous and burst. The continuous current rating signifies the constant current the ESC can safely manage, while the burst current rating represents the maximum current the ESC can handle for short periods, typically less than 10 seconds.
Understanding Battery Limitations
If you have a 50A 4in1 ESC (continuous current rating), it should be able to handle 200A of total current for four motors, assuming each motor draws equal amps. If you’re only pulling 100A in total, each motor is drawing around 25A, well within the amp limit of 50A. Pulling 100A is a significant load for a 5″ FPV drone, and it’s close to the limit of LiPo batteries, which means they won’t maintain such high current draw long enough to actually damage your ESC. Additionally, the ESC’s burst limit is typically higher than its continuous current limit, allowing a 50A-rated ESC to handle bursts of 70A or even 80A for a few seconds. Therefore, choosing one of the recommended ESCs on our page should suffice for most 5″ FPV drones without much concern.
Durability and Weight Considerations
Modern ESCs are often marketed with higher amp ratings to indicate increased durability and resistance to voltage spikes. Although your drone may not require 50 or 60 amps during normal use, a higher-rated ESC may still be desirable for its increased robustness. Lower-rated ESCs, such as 30-amp models, may be more susceptible to damage during crashes, despite being adequate for typical use. But beware of the increased weight, if you are building a light weight drone you probably want to avoid going overboard.
Sizing Your ESC
When sizing your ESC, consider the following factors:
- Look for recommendations from experienced pilots who have built similar drones.
- Use higher-rated ESCs if you can afford them, as they tend to be more robust and durable.
- If you are designing a unique drone setup or using an uncommon motor, obtain thrust test data or consult the manufacturer to determine the appropriate ESC amp rating.
ESC Firmware
In this section, I will provide an overview of the most important and popular ESC firmware. For a complete and up-to-date list of ESC firmware, visit: https://oscarliang.com/esc-firmware-protocols/
SimonK and BLHeli
Two of the oldest open-source ESC firmware for multirotors are SimonK and BLHeli. These are now obsolete and no longer used in modern ESCs, but they deserve an honorable mention for laying the foundation of the FPV drones.
BLHeli_S
BLHeli_S firmware is the second generation of the BLHeli firmware, developed specifically for ESCs with faster 8-bit “Busybee” processors. This post explains how to connect, flash, and configure BLHeli_S ESCs: https://oscarliang.com/connect-flash-blheli-s-esc/
While the official BLHeli_S firmware is no longer updated (as development shifted to BLHeli_32), custom firmware has emerged to support hardware that comes with BLHeli_S, offering cutting-edge features and performance comparable to the latest and more expensive BLHeli_32 ESCs. A notable example is Bluejay. For a comprehensive tutorial on flashing Bluejay firmware to your BLHeli_S ESC, visit: https://oscarliang.com/bluejay-blheli-s/
BLHeli_32
BLHeli_32 ESC firmware is the third and most recent generation of BLHeli. Designed specifically for 32-bit hardware, it has become closed-source in this iteration. The more powerful processors allow for smoother, more precise, and reliable performance than previous ESCs. This post explains how to connect, flash, and configure BLHeli_32 ESCs: https://oscarliang.com/connect-flash-blheli-32-esc/
BLHeli_32 has many settings that can be confusing, which I explain here: https://oscarliang.com/best-blheli-32-settings/
AM32
AM32 is a relatively new open source firmware that could be the tried-and-true BLHeli_32 alternative. Some latest ESC are already shipped with AM32 firmware. Learn more about AM32 here: https://oscarliang.com/am32-esc-firmware-an-open-source-alternative-to-blheli32/
Which ESC Firmware Should You Choose?
The performance difference between BLHeli_S and BLHeli_32 is minimal, so you can’t go wrong with either option. Both firmware now support Bi-directional DShot, which means you can enable RPM filtering in Betaflight with either type of ESC. Although BLHeli_S ESCs are cheaper, enabling RPM filtering requires flashing third-party firmware (e.g., Bluejay), which involves slightly more work. Meanwhile, BLHeli_32 works out-of-the-box.
BLHeli_32, as the newer generation, offers advanced features that BLHeli_S lacks, such as ESC telemetry and RGB LED support. However, these features do not impact flight performance and are thus not essential. Choose BLHeli_32 if you want a more future-proof ESC, or go for BLHeli_S if you’re on a tight budget.
ESC Protocols
Oneshot protocol
ESC protocols determine the speed of the motor signal between the FC (flight controller) and the ESC. Here is a list of ESC protocols commonly used in FPV drones, arranged from the oldest to the most recent:
- Standard PWM
- Oneshot125
- Oneshot42
- Multishot
- DShot (DShot150, DShot300, DShot600)
- ProShot
Without delving too deep into technicalities, just know that DShot is currently the standard ESC protocol in FPV drones. You should use DShot in Betaflight for optimal performance. DShot has various speeds, indicated by the number at the end of the names. The speed you choose depends on the PID Loop Frequency set in Betaflight. For 2KHz, use DShot150; for 4KHz, use DShot300; and for 8KHz, use DShot600.
How to Connect ESC?
The ESC is powered directly by a LiPo battery, and the motor speed is controlled by a signal from the flight controller. The motors are connected to the ESC through three wires.
In which order you connect the motor wires to the ESC doesn’t matter, because by swapping any two of the three wires, it will simply reverse the motor direction. You can also reverse motor rotation by configuring the ESC in software. I have a step-by-step guide on how to do that: https://oscarliang.com/change-motor-spin-direction-quadcopter/
Single ESC Wiring:
4in1 ESC Wiring:
Regardless of the amount of filtration available on the ESC, you should always solder an additional capacitor to the power pads of your ESC. This will reduce the chance of getting a noisy FPV feed and improve flight performance. Take a look at this tutorial where I explain why and which capacitors you should use: https://oscarliang.com/capacitors-mini-quad/
ESC Anatomy
Now that we’ve covered ESC types, software, and requirements, let’s discuss the anatomy and components of an ESC. The essential components on an ESC are:
- Microcontroller unit (MCU)
- Gate driver
- MOSFET
- Low dropout voltage regulator (LDO)
- Current sensor
- Filtering capacitors
These components work together to control the speed of the motor and ensure efficient operation. I will explain what these components do in more detail below.
A 4in1 ESC basically has four ESCs integrated on the same piece of PCB. These ESCs might share the same components (such as the processor, filtering capacitors, voltage regulators, etc.), making the 4in1 ESC smaller, lighter, and overall more cost-efficient.
LDO
A low dropout voltage regulator, or LDO, is a voltage regulator used for converting battery voltage down to an acceptable level to power the microcontroller and other components.
Micro Controller
The microcontroller, MCU, or processor is the brain of an ESC, and it’s also where the ESC firmware is stored.
Gate Driver
Gate drivers are used to drive the MOSFETs in our ESC. They’re connected to the gate of a MOSFET, hence the name “gate driver.” Older ESCs use simple transistors to drive the MOSFETs. Using dedicated gate drivers improves active braking effectiveness. Instead of having separate gate drivers for the three motor phases, modern BLHeli_32 ESCs use the FD6288 IC chip by Fortior. One of these chips contains three independent MOSFET gate drivers in a single chip.
MOSFET
MOSFETs are like switches; they switch the power on and off thousands of times per second, which is how the motors are driven. Bigger MOSFETs usually mean the ESC can handle higher voltage and current, making the ESC more robust and capable of withstanding abuse. MOSFET size is especially important for high voltage rigs, such as 6S, due to the higher voltage spikes.
I have a tutorial explaining how MOSFET work: https://oscarliang.com/how-to-use-mosfet-beginner-tutorial/
Current Sensor
The current sensor measures the current that goes through the ESC and sends that information to the flight controller. This is helpful as you can display the drone’s current draw on screen in real time and see how much battery capacity has been consumed.
ESC Processor
Multirotor ESCs on the market primarily use microcontroller from ATMEL, Silabs, and ARM Cortex. Each type of MCU has unique specifications, features, and firmware support:
- ATMEL 8-bit: Compatible with both SimonK and BLHeli ESC firmware
- SILABS 8-bit: Supported by BLHeli or BLHeli_S
- ARM Cortex 32-bit (e.g., STM32 F0, F3, L4): Can run BLHeli_32
ATMEL 8-bit ESCs running SimonK were more common until Silabs-based ESCs gained popularity due to the rise of BLHeli_S. In 2016, 32-bit ARM Core MCUs were introduced to ESCs, running BLHeli_32 firmware.
BLHeli_32 ESC Processors
BLHeli_32 ESCs use STM32 processors, similar to those found in flight controllers. The common processors used in ESCs are F0, F3, and F4.
Manufacturers started using more powerful F3 and F4 MCUs on BLHeli_32 ESCs since 2021, primarily due to the global chip shortage, not for their processing power. These more powerful ESCs don’t offer significant benefits over the original BLHeli_32 ESCs based on the F0 processor or older BLHeli_S ESCs (non-STM32 MCUs). The high PWM frequency (e.g., 128kHz) offered by these faster processors is mainly useful for certain aircraft, like cinematic flying and micro drones, where smoother motors and better efficiency are desired. This high PWM frequency doesn’t provide optimal acceleration and torque at low RPM for powerful and fast FPV drones.
To take full advantage of “variable PWM frequency by RPM” feature in BLHeli_32, smaller aircraft can benefit from the higher PWM frequency of the faster F4 processor (up to 128KHz) because they typically have much higher RPM and higher-frequency harmonics. For larger drones, such as 5″, the RPM is lower, and 96KHz or even 48KHz should suffice, making higher PWM frequency less important.
SILABS F330 and F39X Processors
DYS XM20A – F390
These processors are used in BLHeli_S ESCs.
SiLabs-based ESCs feature various processors with different performance levels, such as the F330 and F39X (F390/F396).
The F330 has a lower clock speed than the F39X and may struggle with high KV motors. The F39X doesn’t have these issues and supports Multishot ESC protocol and Oneshot42 seamlessly. Well-known examples include the Littlebee 20A (F330) and DYS XM20A (F39X).
Busybee (EFM8BB) Processors
Aikon SEFM 20A – BusyBee
These are BLHeli_S ESC Processors.
Busybee MCUs are an upgrade to the F330 and F39X. If you currently have a BLHeli_S ESC, it probably uses a BusyBee chip. There are two BusyBee chips:
- BusyBee1 – EFM8BB10F8 (aka BB1)
- BusyBee2 – EFM8BB21F16 (aka BB2)
Rather than using software PWM (pulse width modulation), Busybee MCUs have dedicated hardware for generating a PWM signal synced with the processor’s duty cycle, resulting in smoother throttle response. They also support DShot ESC Protocol, making them a cost-effective and efficient solution for today’s standards
Examples of ESCs that use these MCUs include the Aikon SEFM 30A and DYS XS30A.
The overall performance ratings within 8-bit processors are (from the best to the worst): BB2 > BB1 > F39X > F330 > Atmel-8-bit.
Conclusion
Armed with the essential information about ESC types, electrical ratings, protocols, and anatomy, you’re well-prepared to select the perfect ESC for your FPV drone build. Keep in mind that the majority of the latest ESCs on the market perform at a similar level, making it challenging to go wrong with any of the options mentioned in this tutorial. Focus on understanding your specific needs and preferences to find the best match for your build.
Edit History
- Jul 2016 – Article created
- Aug 2017 – updated article with info about BLHeli_32 and 32-bit processors
- Feb 2020 – Updated info, added ESC anatomy and connection diagrams
- Apr 2022 – Added info about BLHeli_32 ESC processor
- Mar 2023 – Tutorial revised, updated ESC recommendations
32 comments
Great article Oscar! Just a quick potential note for your next update: I’ve been seeing the the Busy Bee 5 Family of MCUs showing up on some of the newer whoop/toothpick AIOs [specifically the EFMBB51F16 (AKA BB5)]. Side note, I haven’t had time to compare their data sheets and have absolutely no idea if there’s an actuAl benefit to using them over the BB2. I figured I’d drop a note here just in case someone has some more details or resources to share.
Thank you for everything you’ve done and continue doing! Your site is such a great resource and huge benefit to the community!
thanks so much! I will look into that when I am doing my next update :)
I enjoyed the highest recommended here Tekko32 F4 metal 65A ESC until this afternoon when I simply plugged in the same battery as usual and it exploded, releasing magic smoke and brief fire tongues. Last flight was uneventful, perfect landing, no changes to wiring. I checked and all wiring was OK, no idea what the reason was. Thankfully the FC and motors didn’t get damaged. I saw now too that similar has happened to other owners, see race day quads reviews for example. Oh well, onto a forced “upgrade” :)
Hi Oscar, Another great article, but unfortunately still some of your readers (ahem) are dense enough to be a little confused.
As I understand/read it the ESC protocol is a comms protocol between the FC and ESC. Then the ESC _generates a PWM signal_ that is used to switch the battery voltage using MOSFETs, and drive the motor. As the ESC protocol can itself be encoded as PWM (e.g. for Powershot), or by some other method you have 2 sequences of modulation; FC to ESC then ESC to motor. The value going from the FC to ESC does not include the PWM encoding for the motor; the latter is calculated in the ESC. The FC just sends (“throttle is 8 out of 10 and also here’s some other relevant info”).
My questions
1. Will a motor “see” the same PWM signal arriving irrespective of ESC protocol in use? (For a constant motor speed – understood that some ESC protocols can communicate changes with less latency). If the PWM signal to the motor does vary then that means the ESC Protocol is not just a comms protocol to the FC but also a different way of generating the motor PWM?
2. Same as (1) but for Firmware – will different firmwares generate different PWMs to the motor for the same inbound FC signal? Or is the “competition” between firmwares more about additional features and compatibility etc rather than their PWM motor output.
3. If neither the ESC protocol nor the firmware make any difference to the PWM experienced by the motor (except in terms of latency from a change in input), does any thing else do so? Or is there a fixed/optimal PWM pattern to drive a motor with a given speed requirement coming from the FC.
Cheers!
Hi Oscar, Thank you for the article, and keep it updated.
I have the FC AIO hakrc f4126 but cannot connect the BLHeliSuite32.
Although I have upgraded it to the latest Betaflight version.
I tried different USB ports (with Lipo connected) and computers with the same result.
“ESC#1 Bootloader d #100 seems not valid for BLHeli_32”
This is a new FC, Is that an issue with the FC?
Thank you and very much.
No mention of AM32 and the Skystars KM55A?
In the complete list of ESC firmware article I linked to, I mentioned AM32. But it’s worth noting that this firmware is more advanced and typically not necessary for beginners to focus on.
Can u plse recomend a ecs for my bugs mini plse thank u
Hi Oscar, can’t seem to get help elsewhere. I use a 60A 6s stack and run 4s. I read your article on motor output limit and decided to use my 6s batteries. My quad capacitor and FC burns after hovering for a few seconds. I thought maybe it wasn’t truly rated for 6s. I got another FC (xilo stax) and it worked fine on 4s. As soon as I pug in a 6s battery FC goes dark. Burned up again. Using a 1000uf 50v capacitor. Why is my ESC having this issue on 6s?
Hi does anyone know what is capacitance of ceramic capacitors on mamba esc Mamba f405 stack MK2, the ESC which is rated 40A. they are brown small ceramic capacitors just need to replace some but I do not know what is capacitenc woltage should be 35 or 50 v thanks
Can someone tell me if my ESC (Mamba F40HV ESC) is compatible with BLHeli_32? Cannot find any information regarding the MCU that is built in.
No they are not compatible with BLHeli_32, only BLHeli_S.
Hi Oscar,
I have 1404 4533KV tiny trainer motors and it suggest to use 3S batteries. It also suggest a specific Betafpv AIO FC+ESC with 20A.
If the website of Betafpv now shows a similar AIO FC+ESC with 35A, would it be dangerous intall that one and try to do the build with 4S batteries? How does the choice of FC, ESC and Batteries reflect on the motors? Do the motors anyway decide how much current to withdraw? Or is that something that comes from the FC (hence me giving input to the sticks) and consequently the motors rotate faster and could even burn-out?
How do you tell if your 4n1 ESC has an integrated PDB? Can I assume that all 4n1 ESC has integrated PDB or is there some spec to look for. I’m building my first quad.. don’t know very much.
This is the one I have: rotorvillage.ca/aikon-ak32pin-25a-6s-4-in-1-blheli_32-esc-20×20
All 4in1 ESC acts like PDB.
There is one mistake in MCU names, it is not Atmel ARM 32bit MCU (these are called SAM), but only ARM 32bit Cortex MCU. ARM is vendor of core and other companies, like ST Microelectronics, NXP, Microchip (they bought Atmel) etc, add some pheripheries and build MCUs
hello, thanks for the great info. The latest HW30A esc has a 20-pin SSOP processor chip on it with the markings scratched out. These are like $4 from china now. I am trying to figure out what processor chip it is. Does anyone have an idea? It looks like it has 4 pads to load firmware to it.
Appreciate any info!
I built a large quad intending to use two 2s batteries in parallel as I was getting a good 20+minutes of run time on old generic 30A pwm ESC’s and 2210 1000kv motors on an old CC3d FC. Now I went and upgraded to an F4 with integrated VTX, which I like overall, but I also “upgraded” ESC’s to 50A (which is overkill but it was affordable and I wanted that 8mm wide form factor).
I’ve yet to solve the mystery of why but I can now only fly if I run this setup with batteries in series for 4s (which is causes the motors to eventually overheat). I guess that’s ok if I’m going to replace the motors but things were all rated starting at 2s- it still tries to fly but lacks the power. (but I know it CAN fly this way because it did so on the original generic FC/ESC’s). I wonder if this is a variable I can limit in betaflight or Blheli32? (or on the Taranis somewhere- using an X8R Rx). Anyway thanks for any insights. I will probably change motors if I can’t figure this out. Here are the ESC’s, btw: amazon.com/iFlight-SucceX-50A-Slick-2-6S/dp/B07PBMQM6K
Hello! Is there any difference between f. e. 2306 2600kV with 5″ props (20Amps @ 4s) and 5010 300kV with 18″ props (20a @6s), when I chose the ESC, f. e. 30A 3-6S blheli?
No, as long as the ESC meets the current requirement.
Hello my friend, nice post…
I have a question, when you find a 4×1 esc that says it is 20 amp… is it means that is 4 x 20 amp or 4 x 5 amp that the total is 20 amp ?
Thank you!
the amp rating is normally referring to each individual ESC… so it should be 4x20A
HI,
I am building 5″ quad and would like to have a decent freestyle quad. So I ordered my FC (HGLRC F440, 4in1 esc 40amp rated) and my 1300mah 90c 4s tattu r-line batts but I couldn’t order the motors I wanted (3B 2207 2650kv motors) because they were out of stock. So while I have being waiting for them to come into stock I was researching other motors and found results that opened up another whole range of motors I could choose and now I’m lost again to which motors I should pick.
Wanted to know if you assist me picking them.
(sitting on a budget of around $130 AUD any lower for good quality would be awesome)
Thanks
Daniel.
Check out the Brotherhobby R6 2207 or 2306 :) I tried them and they are awesome!
You should do a write up, how to make a small raspberry pi, with beta flight on it with touch screen for a in the field pocket computer you can keep in you backpack.
There’s speedy bee for Android! Just need a OTG USB cable ;)
Don’t do that. Buy a speedybee adapter for ~$35 and use that with your quads instead. You can ro all the same stuff that you would with actual betaflight, but on your phone.
KDE esc’s are also there used for bigger multi copters..
I built a quad using those emax bullet 30A esc’s and even though I was not overloading them (roughly 108A total peak) I had 4 of them catch fire. They were arm mounted (thankfully), and one even caught fire upon plug in, still in my hand. Needless to say the unburnt ones I have will remain in the drawer….
On another note I have become such a huge fan of 4-in-1’s now. I wasn’t expecting as much but they have all been super hardy (one of mine even went in the Pacific!) and fly great. I am slowly transitioning the flock over.
Hello I have Racestar BR2212 1000kv motor, 4 of them . I’m confused which esc to buy.Can anyone pls recommend? It would be a great help if you do so.
Hello I am a beginner builder of a zmr250. First time build. I have ordered an open flight cc3d fc. My question is, can i power my cc3d with my cc3d pbd via jumping through a 5v bec off my pdb directly? Or should I just power fc via 20amp esc with built in 5v bec. I’m trying to avoid the esc route due to weight and money saving.
On that fob there should be a 5v output that you can use to power the cc3d. I have the mini cc3d on my one and that is how I power mine. My other quad has the skyline acro and I have to run a hot wire from the pdb up under it to a 5v in on that bc it don’t have pins like most do, kinda makes it like the tower ones. Hope that helps