i’m going crazy with a power problem for an electronic toy i’m building as a christmas present for my cousins…
i just made a circuit for controlling a stepper motor (taken from an old epson printer) using an L293D. I’m using the Arduino Nano 5v pin as a power source for the L293D and it works perfect when i Arduino is powered from the USB.
But when i use an external power supply the motor behaves correctly just for few seconds, and then starts moving erratically, affecting all other parts of the circuit (leds start to “strobe” synchronized with the “bad” steps of the motor).
This external power supply is 12v 2amp, as i want to power a tiny portion of a monochrome led strip by using the vin pin on the Arduino Nano… but anyway, if i just remove the led strip from the circuit, the behavior of the motor is still incorrect, so it doesn’t look like the problem is related with the leds at all…
I’ve read on the forums that maybe this is related with some thermal switching of the l293d?
any clues on this?
and merry christmas!!!