So recently I have started a project, I'm using an Arduino nano, 2 digital servos, and a senso, which has a built-in battery and and two output wires, SIGN and GND.
So I connected the the servos communication wires to D5 and D8 and the SIGN wire from my sensor to the A4.
This sensor give DC signals between 0-3.4 and the plan was that these signals would turn my two servos like when you do it with a potentiometer.
Instead of it, it does nothing and after I unplug the Arduino from its battery and the servos from their battery (the sensor, the Arduino nano and the servos are powered from separated sources), the sensor powers it with low voltage and it still does nothing.
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The sensor is from the spider, and I printed a Bionic arm, and I wanted to control the servos using the spider's motherboard as a sensor.