When the button is pressed the Arduino board will put pin 2 in HIGH state, meaning 5V on pin 2. This voltage is used to drive the transistor that will switch ON the relay and the load (in our case the ...

He decided to use an SSR to switch the coil, and after making lots of transistor-based designs on paper, grabbed a nearby Arduino. [Ed] took off the PTC and soldered in two wires to its pads for ...

To solve the problem without sourcing a new switch, [Jean-Noel] built his own Arduino based Dahlander switch. This consists of three relays that select the wiring configuration for each speed mode.

My suspicion is that the MOSFET would be easier as I could just connect the "remote power" wire (which supplies ~12v when I switch to a certain mode in the radio) to the MOSFET's Gate, connect the ...