3:03 AM
(1) Just a quick reply to cheap and small stepping motors. You might like to look into "28Byj48". See Ref 3 of the Reference below.
2 hours later…
5:19 AM
2 hours later…
8:18 AM
Now I am testing my Pico MicroPython Program controlling 4 I2C PCF8574 8-bit IOx modules each of which moves 2 tmc2160 stepper motor controller each moving 1 stepper motor.
2 hours later…
10:35 AM
Now I am making a plan to measure motor current, which is what the OP is asking for. I am doing it in two steps: (1) Using a resistor, perhaps 0.5 ohm, in series with the motor coil to ground. I can use a scope to display the current waveform. (2) use a current mirror/amplification chip to do the job.
Reference: Current mirror: real-life examples? - EESE Q&A, 2021jan24
https://electronics.stackexchange.com/questions/544378/current-mirror-real-life-examples
https://electronics.stackexchange.com/questions/544378/current-mirror-real-life-examples
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Discussion between tlfong01 and Sandro
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