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    Good news! Less hot & more power, nice. Just...

    Good news! Less hot & more power, nice.
    Just checking: so you connected a 47uF (or 100uF) cap from motor+ pin to the source pin of the FET [GND]?
    And your 2 photo's above are measured over the...
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    Yeah, I had the same thought. Why would a...

    Yeah, I had the same thought. Why would a receiver module have 8 channels but only 1 RX...?
    Anyway, glad it's working!

    Paul
  3. Impressive & great job!

    Impressive & great job!
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    Do I understand correctly that the receiver only...

    Do I understand correctly that the receiver only has a single pin for RX, being pin CH 7?

    27187

    It may be interesting to see how you actually hooked up the receiver and the TXS0108E part....
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    I googled for "crossfire RC receiver" and got...

    I googled for "crossfire RC receiver" and got many hits.
    Do you happen to have a datasheet of the exact part you are using?

    Paul
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    That seems to be on the low side - I expected a...

    That seems to be on the low side - I expected a higher value for an unpowered board.
    Unfortunately I don't have a T3.6 here, but I measured on a T4.1: ~11K5 between 3V3 and GND.
    Perhaps someone...
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    No, not going to start a holy war here :-) I...

    No, not going to start a holy war here :-)
    I just know that the FDD3706 works fine without a driver, see my message #56.
    Bought 10pcs here. Still on stock.

    Paul
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    With respect to the AP4410 MOSFET: I assume you...

    With respect to the AP4410 MOSFET: I assume you are going to use a driver?

    Paul
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    Well, that sounds like that one FET is broken....

    Well, that sounds like that one FET is broken. Perhaps killed by static when touching the pins? Who knows... I assume you swapped the motors to rule out the motor and its wiring?

    What totally...
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    Hmm, doesn't sound encouraging. With the bare...

    Hmm, doesn't sound encouraging.
    With the bare Teensy not connected to power or USB, can you measure the resistance between pin 3V3 and GND?

    Paul
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    Not necessarily. It sounds more like the onboard...

    Not necessarily. It sounds more like the onboard 3V3 regulator is overloaded.
    Can you see any metal/solder pieces on the board that don't belong there and that could cause a short on the 3V3 line?...
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    I think we have to take into account the...

    I think we have to take into account the electromotive force (EMF) that is generated by the motor when the current through the motor is halted. This EMF voltage will be seen at the drain of the FET....
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    I just measured the drain to GND voltage on my...

    I just measured the drain to GND voltage on my setup and it is ~25mV during the ON time. So the FET is fully driven open.
    If you want I can mail you 2pcs FDD3706 for experimenting.

    Paul
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    If I'm not mistaken, it looks like the FET is not...

    If I'm not mistaken, it looks like the FET is not fully driven open. I would expect the negative pulse to be near GND. Now I see, especially on the righthand image, that the drain is at 1V. 1V x 1.5A...
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    Ah, you're using a propeller as load... that...

    Ah, you're using a propeller as load... that probably explains the 10x higher current figure on your powersupply.

    Paul
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    The big difference between your and my...

    The big difference between your and my measurements is that you measured across the motor and I measured the voltage on the gate of the FET.
    I did so because I expect the FET to not be driven...
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    Scope screen when the external motor voltage is...

    Scope screen when the external motor voltage is switched off:

    26982.

    So the ringing of the falling edge is indirectly caused by the motor current. I suspect the GNDs are not great at my setup...
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    OK, made a setup with a 8520 dronemotor on a...

    OK, made a setup with a 8520 dronemotor on a Teensy 4.0 using an FFD3706 FET.

    26979

    Uploaded this code:

    void setup() {
    pinMode(6, OUTPUT);
    analogWriteFrequency(6, 20000);
    ...
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    Danke recht herzlich Frank but I'm happy with my...

    Danke recht herzlich Frank but I'm happy with my benchtop scope.

    Paul
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    From the user manual, the software doesn't look...

    From the user manual, the software doesn't look that bad...
    Did you see this software? https://github.com/OpenHantek/openhantek

    Paul
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    If you want to go low-budget, you could consider...

    If you want to go low-budget, you could consider this one: https://de.aliexpress.com/item/32826931942.html.
    You need to use your PC but you get much more scope for that money.

    Paul
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    Interesting...the biggest setback is probably the...

    Interesting...the biggest setback is probably the analog bandwith of only 200kHz, which makes this scope of limited use [to say it nicely].

    Paul
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    Just curious, what oscilloscope did you purchase...

    Just curious, what oscilloscope did you purchase for €50?

    Paul
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    If you can wait for a few days, I will do a test...

    If you can wait for a few days, I will do a test with an 8520 dronemotor on a Teensy 4.0 using the FFD3706 FET here as well.

    Paul
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    Personally I have used an ONsemi FDD3706...

    Personally I have used an ONsemi FDD3706 FET several times. No driver, just connected the Teensy pin directly to the gate.
    If my calculations were right, the gate current was only 7mA with a rise...
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    Yes, that could lead to the heat. A FET stays...

    Yes, that could lead to the heat. A FET stays only cool if you switch the gate fast - hence the use of a driver to take care of that gate current. Simply said, a FET gate is a capacitor that you need...
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    If the driver isn't driving the FET gate with...

    If the driver isn't driving the FET gate with nice fast edges due to the too low power supply voltage, I can imagine that the FET gets warm.

    Paul
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    Seems that most DAW software can do this. See for...

    Seems that most DAW software can do this. See for example https://sonicbloom.net/en/ableton-live-tutorial-computer-keyboard-as-midi-controller/

    Paul
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    My bet would be the driver. You are formally...

    My bet would be the driver. You are formally operating the chip outside its voltage supply range and thus:
    Notice: The device is not guaranteed to function outside its operating ratings.


    Did...
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    Hallo Rolf, are you sure you measured 5.3Vpp?...

    Hallo Rolf, are you sure you measured 5.3Vpp? That seems strange given a powersupply voltage of 3V3.
    Also the datasheet states 2.1Vrms (typ) for output voltage.

    Paul

    edited: I stand corrected,...
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    You won't actually get a Teensy 4.1, instead you...

    You won't actually get a Teensy 4.1, instead you get memory expansion chips...
    See the review of this buyer:


    Paul
  32. Hello Frank, this statement is worrying. I...

    Hello Frank, this statement is worrying.

    I would look into this first as it looks like the onboard regulator is giving up due to too much current.

    Also, this line in setup():
    ...
  33. The encoder library is, by design, operating in...

    The encoder library is, by design, operating in 4x counting mode: "The library updates its count at each change, which is often called 4X counting". It's not a mode you can select.
    I just divide by...
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    Probably obvious, but did you open the Arduino...

    Probably obvious, but did you open the Arduino serial monitor?

    while (!Serial) {
    yield();
    }

    Paul
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    Great! Happy to hear that it is finally working. ...

    Great! Happy to hear that it is finally working.
    Now on to your custom board...
    Noticing your experience with the cheapo boards, I'll stick with Waveshare boards for mission-critical applications...
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    That seems OK. I'm out of ideas for now. Can...

    That seems OK.
    I'm out of ideas for now.
    Can you perhaps send a photo of your setup? Are you still using your custom board or did you perhaps make a basic breadboard setup like I did?

    Going...
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    Hmm, the plot thickens... When the CAN bus is...

    Hmm, the plot thickens...
    When the CAN bus is idle [Teensy and analyzer not sending data] I measure 2.5Vdc between GND & CANL and between GND & CANH on the 3-pin analyzer connector.
    Do you see the...
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    And did you connect the GND pin of the analyzer...

    And did you connect the GND pin of the analyzer to the Teensy GND as well?

    Paul
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    It looks like you set everything correctly in the...

    It looks like you set everything correctly in the analyzer.
    However the bottom windows does not show the reception of any frame.
    That green LED flash may not necessarily mean that a correct frame...
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    Some more info with respect to the screen dump...

    Some more info with respect to the screen dump from message #23:
    - The Teensy runs your program. It sends out frame ID 740, data 06 04 00 00 00 00 00 00. The analyzer shows this in the bottom window...
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    See my message #23. There you can see the CAN...

    See my message #23. There you can see the CAN analyzer screen with the settings I used.
    For the CAN analyzer to "Auto-answer" you have to tell the anayzer what exactly to return when a certain CAN...
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    Hi Jimmie, you need to click the "Set and Start"...

    Hi Jimmie, you need to click the "Set and Start" button to start receiving CAN frames:

    26660

    Paul
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    Here is the code that worked succesfully for me...

    Here is the code that worked succesfully for me with that particular CAN board:

    // https://en.wikipedia.org/wiki/CAN_bus
    // library needed: https://github.com/autowp/arduino-mcp2515

    // Signal ...
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    V8 is here:...

    V8 is here: https://github.com/SeeedDocument/USB-CAN-Analyzer/tree/master/res/Program.

    Paul
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    Yep, that's the analyzer I'm using. It has saved...

    Yep, that's the analyzer I'm using. It has saved me a lot of time in different projects.

    Paul
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    Hello Jimmie, Did some further testing on an...

    Hello Jimmie,
    Did some further testing on an actual Teensy 4.1 with a Waveshare and a cheapo CAN module. Using your exact code from message #9.

    2658426585

    Both seem to work OK when connected...
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    Hello Jimmie, Did you notice that the silkscreen...

    Hello Jimmie,
    Did you notice that the silkscreen text on the backside of the module is wrong? [at least, on the 5 cheapo modules I have here].

    26576

    Could it be that you hooked them up...
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    Your remark about knockoff ICs triggered me to...

    Your remark about knockoff ICs triggered me to have a closer look at both boards and especially the chip on it.
    I did notice the font used for the chip marking on the Waveshare board is slightly...
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    Good to hear that you found the culprit. Well,...

    Good to hear that you found the culprit.
    Well, guess I was lucky then since I've used 5+ of those cheapo boards without a problem...
    And yes, I have 2 Waveshare boards too and they perform indeed...
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    Things to check: - visual inspection of all the...

    Things to check:
    - visual inspection of all the solder joints/connectors/pins/wiring,
    - check for power supply voltages present on all the parts,
    - check signal waveforms with an oscilloscope,
    -...
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