Nice clear explanation of what could be a fairly common problem when using peripherals of "unknown" provenance. Honest too, so thank you for that too. One of my first lessons, delivered fairly but VERY firmly by my then-boss at an IBM mainframe site, was "never assume", and "always be completely honest in what you did do / didn't do". Both of these attitudes served me well, particularly the latter which saved me from the chop on two occasions when, later in my working life, I was a contractor.
@orhanyor
2 жыл бұрын
I suggest you use a proper hi-speed level shifter which is meant to be used with neopixels. chip is called 74AHCT1G, costs only few cents and it works like a charm
@lerymisandari4015
2 жыл бұрын
about that 2 stage level shifter: when I connect 5v through a 480ohm resistor to pwm pin of my motor driver the voltage drops to 3v. This means that in order to have a reliable signal I have to put a ~300ohm pull up resistor. would you change the resistor only on the side of the driver or they have to be in a symmetry? seems to me i can get away with only replacing one, but i'm not an engineer. anyway, it's already been a great help to me. thank you! I appreciate it.
@PenguinTutor
2 жыл бұрын
In the example it's designed for a high-impedence next stage, typically something pulling only one or 2 milliamps maximum. To need a 300ohm resistor then that suggests the driver needs around 7mA which is surprising, but not unfeasible. If that is the case then you only need to change RL2 (the last one before the output). RL1 is used to drive Q2, so 2k2 should be fine for that resistor.
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