There was a recent discussion on Discord about getting a fully integrated board as cheap and small as possible. Got some time over my lunch break and cooked up Hot Dog! 20mm x 20mm, fully integrated, 26v / 10A. Cost to fab is $10/board. Mosfets driven directly by the MCU. Absolutely no protection. …

[image] mshamber: I’ve been looking into the gan fets which are more power efficient than silicon mosfets. There some new fets from epc that could be used to build a small powerful high efficiency motor driver. Probably the They certainly look nice, although a PCB layout example in the data …

[image] Andrey_Sabadash: To improve efficiency vertical and horizontal flight, need fast control pitch blades of propeller group. Nice application! I get it. And while I can’t say whether it would work out in the end, I think it is definitely possible to significantly outperform standard RC-s…

[image] runger: wind up with a lot of wires coming out of the little boa rd Agree. I do not understand the fixation on ultra small boards, when ultimately the wires coming out weigh more that the little saved on space and weight, and dramatic restriction on functionality, just to save 2mm an…

[image] Valentine: Designing an ultra small board is more like playing sudoku. I agree, its an interesting puzzle/challenge… I think there is a need for smallish boards - to make smallish robots/devices. But there comes a cut-off point where the size impacts the usability to such a degree th…

[image] Andrey_Sabadash: can or pwm control. Can you instead control the servo via an analog pin, say, center around 1.65v and split 3.3v for 90 or 180 degrees left or right? Can is very bulky (requires transciever) or pwm control requires very large timeouts especially if you use the RC PWM.…

Hey, back to the topic of the Hot Dog… I’ve been playing around with tiny design ideas, inspired by the Hot Dog, and trying to see how small a board can be… [image] Valentine: Mosfets driven directly by the MCU. I’m just not understanding how this works - I know I have just the picture and …

Here’s my attempt so far: It’s a 12.5 x 17.5mm BLDC controller with on-board MCU and sensor, for mounting on a motor. [image] [image] Should work for 4.5-18V, max 1-2A STM32G431 MCU MA782 sensor Current sensing via MCU’s built-in opamps USB/Serial, CAN, I2C, SWD (all TTL, just the MCU pins, tr…

[image] runger: don’t you need a charge-pump Not sure. Specs say i dont. Thats why I want to make only the power stage, else its hard to test. But you are correct I need to overcome the high side voltage. This is just a toy right now.

[image] runger: 12.5 x 17.5mm looks amazing О_о I even took a ruler to understand how small the board is :slight_smile: Do I understand correctly that a separate solution with power transistors and a power measurement circuit in comparison with a ready-made driver in the form of a single m…

[image] runger: Feedback is welcome Great, very interesting and educational. Do you have a schematics? Can’t really tell much from the layout.

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Hot Dog! Scary new BLDC board, are you brave enough?

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