I'm trying to control a USB-powered turntable with an Arduino Uno and a relay module. I have it connected like so with a USB cable I tore apart:
The turntable's power requirement is 5V 500MA. But it does not turn on when it should.
I tore apart the other end of the USB cable to test it and sure enough, the required power is running through the cable.
What might I be missing? I know that the Arduino's ability to power other devices is limited, but it seems like the turntable should run if Arduino is sending the required power through the circuit.
What am I missing?
How do you power the Uno?
If it's USB, there is a fuse on the Uno that limits the current to 500 mA. Your turntable plus Arduino plus relay will draw more than that.
If it over the barrel or Vin (e.g. 9V), the max current that you can draw is lower because the voltage regulator that converts the 9V to 5V can not dissipate much heat.
And that is about how far I can help.
That’s good, what is the supply capability of the UNO ?
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Does the relay module close the circuit when commanded to by the Uno?
What is the current requirement of the relay coil?
Do you have a program to turn it on?
You are relying on the Uno to supply power to both the turntable and relay module?
