From ce04f5dd5752a1e336f3ea1dc8a492395c7c31b8 Mon Sep 17 00:00:00 2001 From: Akbar Rahman Date: Sat, 13 Apr 2024 20:44:27 +0100 Subject: [PATCH] add old posts --- blog/first_post.md | 11 +++ blog/g27_pedals.md | 182 ++++++++++++++++++++++++++++++++++++ blog/lastfm_bookmarklets.md | 2 +- 3 files changed, 194 insertions(+), 1 deletion(-) create mode 100755 blog/first_post.md create mode 100755 blog/g27_pedals.md diff --git a/blog/first_post.md b/blog/first_post.md new file mode 100755 index 0000000..c38e547 --- /dev/null +++ b/blog/first_post.md @@ -0,0 +1,11 @@ +--- +author: Akbar Rahman +date: Fri, 31 Jul 2020 19:52:52 +0100 +title: first post +tags: [] +uuid: fd338dc9-ae5f-48f4-9fc6-e02e88ab4ce5 +--- + +# first post + +this is my first post diff --git a/blog/g27_pedals.md b/blog/g27_pedals.md new file mode 100755 index 0000000..40e5207 --- /dev/null +++ b/blog/g27_pedals.md @@ -0,0 +1,182 @@ +--- +author: Akbar Rahman +date: Tue, 04 Aug 2020 15:20:13 +0100 +title: Repurposing Racing Wheel Pedals +tags: [ g27, sim_racing ] +uuid: 0f09200e-fd50-451b-aae1-1117a8a704db +--- + +

Repurposing Racing Wheel Pedals

+

I have a Logitech G27 I don't use much. I wondered if I could use it for anything else. I could.

+ +

The Pinout of the Connector

+ +

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
+ +

Reading the Values of the Pots

+ +I'm using an Arduino to read the pots and then do something with the values. +I very dirtily wired pin 4 on the pedals to GND on a Arduino Uno, pin 9 to 5V, and +pins 6,7,8 to A0, A1, and A2. +I used a basic sketch to check that everything is good: + +
+ Show/hide test_sketch.ino +
 void setup() {
+	Serial.begin(9600);
+}
+
+void loop() {
+	Serial.println(analogRead(A2));
+	delay(20);
+}
+
+
+ +I noticed that the minimum and maximum values read by the Uno were quite far off 0 and 1024, like +they should be, and voltage was being lost on the way to and from the potentiometers. +Since the pedals have to be calibrated every time you plug them in, I assume this is normal and +spat out this code: + +
+ Show/hide sketch_aug02a.ino +
// 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); 
+}
+
+
+ +

Actually Making the Numbers Do Something

+ +This is where you can make the pedals do fun things. +I reworked another piece of code I wrote to do a similar thing to quickly create a script that +reads the values sent by the Arduino, and then simulate pressing a key combination. +The only thing I've done with this is set push-to-talk to ctrl-shift-alt-1. +I don't know what else I could use this for, maybe temporarily muting particular things, like music. + +
+ Show/hide pedalboard.py +
 #!/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)
+
+
diff --git a/blog/lastfm_bookmarklets.md b/blog/lastfm_bookmarklets.md index b26273a..b61b395 100755 --- a/blog/lastfm_bookmarklets.md +++ b/blog/lastfm_bookmarklets.md @@ -1,6 +1,6 @@ --- author: Akbar Rahman -pub_date: Sat, 13 Apr 2024 20:00:31 +0100 +pub_date: Mon, 18 Sep 2023 16:25:48 +0100 title: last.fm bookmarklets tags: [ last.fm, scripts ] uuid: e54ebf58-4033-4dae-81db-91db344f1311