Intial working version

1 files changed, 60 insertions, 0 deletions

diff --git a/rpi-temp-control.py b/rpi-temp-control.py
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+++ b/rpi-temp-control.py
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+#!/usr/bin/env python3
+
+##
+# rpi-temp-control
+#
+#
+#
+# Matt Kohls
+
+import subprocess
+from gpiozero import Motor
+from pid import PID
+from time import sleep
+
+# Defaults
+TEMP_TARGET = float(47.0)
+FAN_PIN = 17   # Pin the fan control is tied to
+DUMMY_PIN = 18 # Any unused pin. Used to setup Motor from gpiozero
+MIN_FAN_SPEED = 80 / 100
+
+## Grabs Temperature of GPU/CPU
+#
+# @return temperature of GPU/CPU
+def grab_temp():
+    try:
+        file = open("/sys/class/thermal/thermal_zone0/temp", "r")
+        val = int(file.readline()) / 1000
+        file.close()
+        return val
+    except:
+        print("Error reading from thermal zone")
+        return 0
+
+# Initial loop setup
+ploop = PID(1, 1, .02, Integrator_max=100, Integrator_min=0, Set_Point=TEMP_TARGET)
+cycle = 1
+fan = Motor(FAN_PIN, DUMMY_PIN)
+fan.forward(cycle)
+last_duty_cycle = 0
+last_temp = 0
+
+while True:
+    sleep(1)
+    temp = grab_temp()
+    print(temp)
+    cycle_change = (ploop.update(temp)) * -1
+    cycle = (100 + int(cycle_change)) / 100 # Since fan.forward() wants a number between 0 and 1
+
+    if cycle <= .2:
+        cycle = 0
+    elif cycle > 1:
+        cycle = 1
+    elif cycle < MIN_FAN_SPEED:
+        cycle = MIN_FAN_SPEED
+
+    if cycle == 0:
+        fan.stop()
+    elif last_duty_cycle != cycle:
+        fan.forward(cycle)
+    last_duty_cycle = cycle
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