I have a Logitech G27 I don't use much. I wondered if I could use it for anything else. I could.
+ +The first thing I had to do was figure out what each pin did on the DE-9 connector, and which +ones I should care about. +This was done easily after I took off the top plastic casing thing by poking the three 100k Ohm +potentiometers and the connector in the right places at the right times: +
+ + +
+| pin | function |
|---|---|
| 1,4 | ground |
| 6 | clutch pedal |
| 7 | brake pedal |
| 8 | accelerator pedal |
| 9 | voltage in |
void setup() {
+ Serial.begin(9600);
+}
+
+void loop() {
+ Serial.println(analogRead(A2));
+ delay(20);
+}
+// sensor pins
+int sa = A0;
+int sb = A1;
+int sc = A2;
+
+// minimum values detected by the sensors
+int mina = 1025;
+int minb = 1025;
+int minc = 1025;
+
+// maximum values detected by the sensors
+int maxa = 512;
+int maxb = 512;
+int maxc = 512;
+
+// raw values of the sensors
+int rva, rvb, rvc;
+
+// calculated values of the sensors (between 0 and 1, this is the value sent to computer)
+float cva, cvb, cvc;
+
+void setup() {
+ Serial.begin(9600);
+}
+
+void loop() {
+ rva = analogRead(sa);
+ rvb = analogRead(sb);
+ rvc = analogRead(sc);
+
+ if (rva < mina) mina = rva;
+ if (rvb < minb) minb = rvb;
+ if (rvc < minc) minc = rvc;
+
+ if (rva > maxa) maxa = rva;
+ if (rvb > maxb) maxb = rvb;
+ if (rvc > maxc) maxc = rvc;
+
+ cva = (float)(rva-mina)/(float)(maxa-mina);
+ cvb = (float)(rvb-minb)/(float)(maxb-minb);
+ cvc = (float)(rvc-minc)/(float)(maxc-minc);
+
+ Serial.print('[');
+ Serial.print(cva); Serial.print(',');
+ Serial.print(cvb); Serial.print(',');
+ Serial.print(cvc);
+ Serial.print(']');
+ Serial.println();
+ delay(20);
+}
+ #!/usr/bin/env python3
+
+import sys
+import json
+import time
+from enum import Enum
+
+import keyboard
+import serial
+
+class KeyState(Enum):
+ UP = 0
+ DOWN = 1
+
+STATES = [KeyState.UP] * 3
+THRESHOLD = 0.8
+MACROS = ['ctrl+shift+alt+1', 'ctrl+shift+alt+2', 'ctrl+shift+alt+3']
+
+def get_args():
+ """ Get command line arguments """
+
+ import argparse
+ parser = argparse.ArgumentParser()
+ parser.add_argument('device')
+ return parser.parse_args()
+
+
+def main(args):
+ """ Entry point for script """
+ while True:
+ try:
+ kb = serial.Serial(port=args.device, baudrate=9600)
+ while True:
+ handle(json.loads(kb.readline()))
+ except serial.serialutil.SerialException as e:
+ print(e)
+ print("Failed to connect to device... trying again")
+ time.sleep(1)
+ except Exception as e:
+ print(e)
+ return 0
+
+def handle(data):
+ global STATES
+
+ states = [KeyState.DOWN if value > THRESHOLD else KeyState.UP for value in data]
+ r = [handle_state_change(i, states[i]) if states[i] != STATES[i] else None for i in range(len(STATES))]
+ STATES = states
+ return r
+
+def handle_state_change(key, newstate):
+ print(f"{key} {newstate}")
+ return keyboard.press(MACROS[key]) if newstate == KeyState.DOWN else keyboard.release(MACROS[key])
+
+
+if __name__ == '__main__':
+ try:
+ sys.exit(main(get_args()))
+ except KeyboardInterrupt:
+ sys.exit(0)
+