Mr. Burnham - Driving the Tachometer - How to turn on and off 12 with 5 volt Arduino or Raspberry Pi IO

Saul, this link may be a way to drive the tachometer and Speed gauges.  You want to protect the 5 volt Arduino / Pi system, but be able to have a 12 volt current switch on and off... see this link

• https://www.baldengineer.com/pwm-3-pin-pc-fan-arduino.html
• https://electronics.stackexchange.com/questions/230802/12-volt-switched-by-5-volt

It's for PWM control of a 12 volt fan.  We could maybe also use a standard motor controller like https://sites.google.com/view/steam-clowns-closet/motor-controller-l298n-dual-h-bridge-motor-controller

Talk to me next time we do Robot Club... You will need to learn how to run the Oscilloscope... so you also will want to try this tutorial...

• Oscilloscopes Made Easy #1 - Introduction to Oscilloscopes (Rigol DS1104Z)
• Oscilloscopes Made Easy #2 - Simple Triggering (Rigol DS1104Z)
• Rigol - BASICS OF OSCILLOSCOPES
• How to Use an Oscilloscope - General overview for a different scope... but still good