I am trying to monitor voltage to a small motor with an ADC. I am using a 5k pot. One leg is at 3V and the other is on ground. The wiper is hooked to 3 things:
-The ADC
-The Motor
-A 3V LED
My goal was to have control of the motor speed with the pot. This works.
I also wanted to monitor the voltage the motor sees with the ADC and use the LED as a visual indicator. This is actually working great....but as soon as I attach the 3V motor, there are problems.
The motor is making some crazy interference while running. The LED flickers and the ADC doesnt get anything. With the motor removed, everything is great.
I heard these small motors can be decoupled with a 01uF ceramic cap. That doesnt seem to matter. I also tried a 22uF electrolytic.
Any ideas? Schematic is attached.
-The ADC
-The Motor
-A 3V LED
My goal was to have control of the motor speed with the pot. This works.
I also wanted to monitor the voltage the motor sees with the ADC and use the LED as a visual indicator. This is actually working great....but as soon as I attach the 3V motor, there are problems.
The motor is making some crazy interference while running. The LED flickers and the ADC doesnt get anything. With the motor removed, everything is great.
I heard these small motors can be decoupled with a 01uF ceramic cap. That doesnt seem to matter. I also tried a 22uF electrolytic.
Any ideas? Schematic is attached.