Here’s a video by Thebishopgame describing how his Guitarduino works, an Arduino/MaxMSP guitar mounted midi control system:
There are 6 arcade buttons on the bridge, three force sensitive resistor squares on the body, and a long FSR strip on the back of the neck. The arduino just takes sensor readings and spits them out the serial port as ASCII, which I take into MaxMSP and assign midi values. The buttons and body FSRs all either generate midi notes or control values and the neck strip function as an “alt” key so I can two different function out of the same button. The midi then goes either into Ableton Live (looper control, drums) or into my AxeFX II (guitar FX), which is also generating the guitar tone. To get that sound, I’m mixing the guitar signal with the AxeFX’s synth block and then slamming that into a drive block and an amp.