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I am running a BLDC motor with Rasberry Pi PICO using DShot ESCs. Everything is good well when I run 1 or 2 motors. However when I try to run 4 motors at the same time. It fries my PICO. It seems motors or ESC is producing a reverse voltage which flows back and fries my PICO. I tried a number of Diodes but some are distorting the frequency and some don't work at all. The Diodes I used

  1. FR302 : passes signal but distorts it makes motors to vibrate and make noise
  2. IN4148: doesnt work
  3. 1N5819: Schottky : just bought going to test them
  4. UF4003: just bought going to test them DSHOT are very high frequency ESCs and I am passing signal in KHz. So I need a Diode that stops voltage from one side but let the signal go undistorted and without any delay. or any other solution. see the image, battery powers up both RPI4 and ESC. then RPI is used to powerup PICO and PICO sends speeds to ESC. PICO and ESC is connected through 5 wires, a ground and 4 motor speed signals. ESC controls the motors. Thanks

enter image description here

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    If you only connect to the ESC control inputs there should be nothing coming back to the pico from the motors.
    – joan
    Jul 10 at 8:22
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    I am saying we don't know if you have done anything wrong or not. We need more information.
    – joan
    Jul 10 at 11:23
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    @tlfong01 (1) I didn't show in the diagram but each motor is connected to ESC using 3 wires. so they are BLDC (2) It can be a reason however it works sometimes, which makes things worse to solve the problem (4) Make sense, however it will keep the ESC safe from motors but not sure if PICO is affected by ESC leaking and not directly from motors. Like if ESC decides to stop / reduce the voltage to reduce the speed then the riffle effect of the voltage goes to the PICO ? T
    – ZAK
    Jul 11 at 2:28
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    @tlfong01 no sorry, there are 3 wires to each motor from ESC to a motor. links for ESC and motors are hobbywing.com/goods.php?id=653 or aliexpress.com/item/… and motors aliexpress.com/item/…
    – ZAK
    Jul 11 at 2:38
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    and I am using a 4 cell Lipo battery with upto 16v .
    – ZAK
    Jul 11 at 2:39

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