okay I am quite shocked (literally )
I am following this tutorial bildr High-Power Control: Arduino + N-Channel MOSFET - bildr
I uploaded the fade example and let the arduino run of the USB power
I connected the MOSFET to pin 9 (the fade pin)
I am using this motor with the PWM https://www.sparkfun.com/products/10455
I used a lead acid battery for the power source. The batteries voltage is 11.1
Once I tied the grounds together I got zapped. I was extremely surprised as my hands are not wet or anything and it was less than 12 volts. I thought.
I measured the voltage across the terminals of the battery when the motors was fading. it was anywhere from 12-36 volts. When I plug in the motor directly to the battery it goes to about 14-16 volts.
What is going on here. I am very confused. please help