adjuster fan script

scripts/fan_control_rpi.sh

@@ -1,40 +1,43 @@
-#PWM1
-#pin35 on the header
+#!/bin/bash
+#set -x
+#===========================================
 
-#Add to boot/consfig.txt:
-#dtoverlay=pwm-2chan,pin2=19,func2=2
+# PWM Output is at PIN35 on the header (PWM1)
 
-#Run:
-#./fan_control_rpi.sh
+# Add to boot/config.txt:
+# dtoverlay=pwm-2chan,pin2=19,func2=2
 
-#install as service:
-#./fan_control_rpi.sh install
+# Run:
+# ./fan_control_rpi.sh
 
-#Also:
-#./fan_control_rpi.sh status
-#./fan_control_rpi.sh start
-#./fan_control_rpi.sh stop
-#./fan_control_rpi.sh unistall
+# Install as service:
+# ./fan_control_rpi.sh install
+
+# Also:
+# ./fan_control_rpi.sh status
+# ./fan_control_rpi.sh start
+# ./fan_control_rpi.sh stop
+# ./fan_control_rpi.sh uninstall
 
 #===========================================
-#!/bin/bash
 
 # Duty cycles specified in percentages
-DUTY_MIN_PERCENT=40   # 40%
+DUTY_MIN_PERCENT=20   # 20%
 DUTY_MAX_PERCENT=100  # 100%
 
 # Temperature thresholds in degrees Celsius
 TEMP_MIN_C=68    # Minimum temperature (degrees Celsius) for the fan to start
 TEMP_MAX_C=78    # Maximum temperature (degrees Celsius) for maximum fan speed
 
 # PWM Frequency in Hz
-PWM_FREQUENCY=25  # 25Hz
-#PWM_FREQUENCY=30000  # 30KHz
+PWM_FREQUENCY=30000  # 30KHz
 
 SERVICE_NAME="fan_control_rpi"
 SERVICE_PATH="/etc/systemd/system/$SERVICE_NAME.service"
 SCRIPT_PATH="/usr/local/bin/$SERVICE_NAME.sh"
 
+#===========================================
+
 install_service() {
     echo "Installing $SERVICE_NAME service..."
 
@@ -55,21 +58,23 @@ Description=Fan Control Service
 After=multi-user.target
 
 [Service]
-Type=simple
-ExecStart=/bin/bash $SCRIPT_PATH
+StandardOutput=file:/var/log/fan_control_rpi.log
+StandardError=file:/var/log/fan_control_rpi_error.log
+Type=simple 
+ExecStart=/bin/bash $SCRIPT_PATH run
 Restart=always
 User=root
 
 [Install]
 WantedBy=multi-user.target
 EOF
 
-    # Reload systemd, enable, and restart the service
+    # Reload systemd, enable, and start the service
     sudo systemctl daemon-reload
     sudo systemctl enable "$SERVICE_NAME"
-    sudo systemctl restart "$SERVICE_NAME"
+    sudo systemctl start "$SERVICE_NAME"
 
-    echo "$SERVICE_NAME service installed and restarted successfully!"
+    echo "$SERVICE_NAME service installed and started successfully!"
 }
 
 uninstall_service() {
@@ -120,91 +125,97 @@ stop_service() {
     sudo systemctl stop "$SERVICE_NAME"
 }
 
-# Check if the script is run with the "install", "uninstall", "status", "start", or "stop" parameter
+run_service() {
+    # Device paths
+    DEV_TEMP="/sys/class/thermal/thermal_zone0/temp"
+    DEV_PWM="/sys/class/pwm/pwmchip0/pwm1"
+    DEV_ENABLE="$DEV_PWM/enable"
+    DEV_DUTY="$DEV_PWM/duty_cycle"
+    DEV_PERIOD="$DEV_PWM/period"
+
+    # Export pwm1 if not already available
+    if [ ! -e $DEV_PWM ]; then
+        sudo sh -c "echo 1 > /sys/class/pwm/pwmchip0/export"
+        sleep 1
+    fi
+
+    # Calculate PWM period in nanoseconds based on frequency
+    PERIOD=$((1000000000 / PWM_FREQUENCY))  # Period in ns
+    sudo sh -c "echo $PERIOD > $DEV_PERIOD"
+
+    # Convert temperature thresholds to millidegrees
+    TEMP_MIN=$((TEMP_MIN_C * 1000))
+    TEMP_MAX=$((TEMP_MAX_C * 1000))
+
+    # Convert duty cycle percentages to actual values
+    DUTY_MIN=$((PERIOD * DUTY_MIN_PERCENT / 100))
+    DUTY_MAX=$((PERIOD * DUTY_MAX_PERCENT / 100))
+    DUTY_OFF=0  # Fan off
+
+    # Enable PWM
+    sudo sh -c "echo 1 > $DEV_ENABLE"
+
+    # Initialize the previous duty value to detect changes
+    PREV_DUTY=-1
+
+    while true; do
+        # Read the current CPU temperature in millidegrees
+        TEMP=$(cat $DEV_TEMP)
+
+        # Ensure TEMP is not empty
+        if [ -z "$TEMP" ]; then
+            echo "Error: Unable to read temperature."
+            sleep 5
+            continue
+        fi
+
+        # Determine the appropriate duty cycle based on temperature
+        if [ $TEMP -lt $TEMP_MIN ]; then
+            DUTY=$DUTY_OFF
+        elif [ $TEMP -ge $TEMP_MAX ]; then
+            DUTY=$DUTY_MAX
+        else
+            DUTY=$((DUTY_MIN + (TEMP - TEMP_MIN) * (DUTY_MAX - DUTY_MIN) / (TEMP_MAX - TEMP_MIN)))
+        fi
+
+        # Ensure duty cycle is within valid range
+        if [ $DUTY -lt 0 ]; then
+            DUTY=0
+        elif [ $DUTY -gt $PERIOD ]; then
+            DUTY=$PERIOD
+        fi
+
+        # If the duty cycle has changed, update and print the values
+        if [ "$DUTY" -ne "$PREV_DUTY" ]; then
+            sudo sh -c "echo $DUTY > $DEV_DUTY"
+            PREV_DUTY=$DUTY
+        fi
+
+        echo "Temperature: $(($TEMP / 1000))°C, Duty Cycle: $((DUTY * 100 / PERIOD))%"
+
+        # Wait before checking the temperature again
+        sleep 5
+    done
+}
+
+#===========================================
+
+# Check if the script is run with the "install", "uninstall", "status", "start", "stop", or "run" parameter
 if [ "$1" == "install" ]; then
     install_service
-    exit 0
 elif [ "$1" == "uninstall" ]; then
     uninstall_service
-    exit 0
 elif [ "$1" == "status" ]; then
     check_service_status
-    exit 0
 elif [ "$1" == "start" ]; then
     start_service
-    exit 0
 elif [ "$1" == "stop" ]; then
     stop_service
-    exit 0
-fi
-
-# Device paths
-DEV_TEMP="/sys/class/thermal/thermal_zone0/temp"
-DEV_PWM="/sys/class/pwm/pwmchip0/pwm1"
-DEV_ENABLE="$DEV_PWM/enable"
-DEV_DUTY="$DEV_PWM/duty_cycle"
-DEV_PERIOD="$DEV_PWM/period"
-
-# Export pwm1 if not already available
-if [ ! -e $DEV_PWM ]; then
-    sudo sh -c "echo 1 > /sys/class/pwm/pwmchip0/export"
-    sleep 1
+elif [ "$1" == "run" ]; then
+    run_service "$2"
+else
+    echo "Usage: $0 {install|uninstall|status|start|stop|run}"
+    exit 1
 fi
 
-# Calculate PWM period in nanoseconds based on frequency
-PERIOD=$((1000000000 / PWM_FREQUENCY))  # Period in ns
-sudo sh -c "echo $PERIOD > $DEV_PERIOD"
-
-# Convert temperature thresholds to millidegrees
-TEMP_MIN=$((TEMP_MIN_C * 1000))
-TEMP_MAX=$((TEMP_MAX_C * 1000))
-
-# Convert duty cycle percentages to actual values
-DUTY_MIN=$((PERIOD * DUTY_MIN_PERCENT / 100))
-DUTY_MAX=$((PERIOD * DUTY_MAX_PERCENT / 100))
-DUTY_OFF=0  # Fan off
-
-# Enable PWM
-sudo sh -c "echo 1 > $DEV_ENABLE"
-
-# Initialize the previous duty value to detect changes
-PREV_DUTY=-1
-
-while true; do
-    # Read the current CPU temperature in millidegrees
-    TEMP=$(cat $DEV_TEMP)
-
-    # Ensure TEMP is not empty
-    if [ -z "$TEMP" ]; then
-        echo "Error: Unable to read temperature."
-        sleep 5
-        continue
-    fi
-
-    # Determine the appropriate duty cycle based on temperature
-    if [ $TEMP -lt $TEMP_MIN ]; then
-        DUTY=$DUTY_OFF
-    elif [ $TEMP -ge $TEMP_MAX ]; then
-        DUTY=$DUTY_MAX
-    else
-        DUTY=$((DUTY_MIN + (TEMP - TEMP_MIN) * (DUTY_MAX - DUTY_MIN) / (TEMP_MAX - TEMP_MIN)))
-    fi
-
-    # Ensure duty cycle is within valid range
-    if [ $DUTY -lt 0 ]; then
-        DUTY=0
-    elif [ $DUTY -gt $PERIOD ]; then
-        DUTY=$PERIOD
-    fi
-
-    # If the duty cycle has changed, update and print the values
-    if [ "$DUTY" -ne "$PREV_DUTY" ]; then
-        sudo sh -c "echo $DUTY > $DEV_DUTY"
-        PREV_DUTY=$DUTY
-    fi
-
-    echo "Temperature: $(($TEMP / 1000))°C, Duty Cycle: $((DUTY * 100 / PERIOD))%"
-
-    # Wait before checking the temperature again
-    sleep 5
-done
+exit 0