Motorcycle Rally Roadbook Controller

I needed something to controll my DMD2 tablet on my bike but the regular rally controllers out there cost a fortune.

This would fit a 22mm handlebar and its about 22.5mm wide!

you will need:

• 3x PBS 33B M12 buttons
• 1x mts-123 2 way rocker
• 4x m3 x 6mm screws
• 2x m4 x 15mm screws
• 2x m4 nuts
• ~50cm 6 core cable (as thin as possible)
• 1 small ziptie
• esp32 controller with bluetooth (BLE) support

Assembly:

• put the m4 nuts into the backplate. they are pressfit. if they are to loose, secure them with some glue.
• Add the buttons and use the included nuts to secure them. start with the top one, then add the 2 way rocker. Follow with the rest. make sure the terminals face the outer walls so sodlering is easier.
• use locktight or superglue to secure the nuts
• get a piece of wire, strip it and solder up ground to one of each button terminal. basicly providing a GND backbone. this way you wont have to solder that much 
• pull through the cable and solder up the rest.
• secure the end of the cable with a ziptie inside the case (just around the 6 core cable ). so it cant be easily pulled through.
• put on backplate
• use the M3x6 screws and secure the backplate
• get a waterproof case and put your microntroller in there, i used an outdoor junction box and sotred that somewhere inside my bike,

Software:

• you'll find the barebone sourcecode here https://github.com/achmed20/rally-controller
• if you have a regular esp32 dev board, solder the wires according to the pin layout (all pins must support interal pullups)
  or
  change use or own layout and change the pins accordingly
• compile and flash the firmware (platformIO works best for me)
• Pair the controller to your device, if it doesnt work, you may need to reboot the controller after flashing
• it will appear as “Rally Controller” and will simulate a gamepad.
• the top button will support multi press and offer more button mapping.
  - 1x = x
  - 2x = y
  - 3x = lb
  - long press = rb

Note:  

• mounting the Buttons is a bit of a pain. You cant turn the Nut so you have to turn the button itself. once its fastened, you probably should glue it own so it doesnt rattle loose