From 17c4afebfc808f984b15766f29b9e9b0a1d3eefd Mon Sep 17 00:00:00 2001
From: Jim Nicholson <thejimnicholson@gmail.com>
Date: Thu, 14 May 2026 12:56:01 -0700
Subject: [PATCH] Fan driver for waveshare board

---
 autofan.py | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 autofan.py

diff --git a/autofan.py b/autofan.py
new file mode 100755
index 0000000..4c6915d
--- /dev/null
+++ b/autofan.py
@@ -0,0 +1,39 @@
+#!/usr/bin/python3
+
+import RPi.GPIO as GPIO
+import time
+import subprocess
+
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(14, GPIO.OUT)
+
+pwm = GPIO.PWM(14, 100)
+
+# print("\nPress Ctrl+C to quit \n")
+
+dc = 0
+
+pwm.start(dc)
+
+try:
+    while True:
+        temp = subprocess.getoutput("vcgencmd measure_temp|sed 's/[^0-9.]//g'")
+        print("CPU Temp: ",float(temp))
+        if round(float(temp)) >= 45:
+            dc = 100
+            pwm.ChangeDutyCycle(dc)
+            time.sleep(180)
+
+        if round(float(temp)) >= 40:
+            dc = 85
+            pwm.ChangeDutyCycle(dc)
+            time.sleep(120)
+        else:
+            dc = 70
+            pwm.ChangeDutyCycle(dc)
+            time.sleep(60)
+
+except KeyboardInterrupt:
+    pwm.stop()
+    GPIO.cleanup()
+