simple fan service for gpio controlled fan

adafruit_fanservice.sh

@@ -0,0 +1,95 @@
+#!/bin/bash
+
+if [ $(id -u) -ne 0 ]; then
+	echo "Installer must be run as root."
+	echo "Try 'sudo bash $0'"
+	exit 1
+fi
+
+clear
+echo "This script will install Adafruit"
+echo "fan service, which will turn on an"
+echo "external fan controlled by a given pin"
+echo
+echo "Operations performed include:"
+echo "- In /boot/config.txt, enable camera"
+echo "- apt-get update"
+echo "- Install Python libraries:"
+echo "  picamera, pygame, PIL"
+echo "- Downgrade SDL library for pygame"
+echo "  touch compatibility"
+echo "- Download Dropbox Updater and"
+echo "  Adafruit Pi Cam software"
+echo
+echo "Run time 1+ minutes. Reboot not required."
+echo
+
+group=ADAFRUIT
+function info() {
+    system="$1"
+    group="${system}"
+    shift
+    FG="1;32m"
+    BG="40m"
+    echo -e "[\033[${FG}\033[${BG}${system}\033[0m] $*"
+}
+
+
+function bail() {
+    FG="1;31m"
+    BG="40m"
+    echo -en "[\033[${FG}\033[${BG}${group}\033[0m] "
+    if [ -z "$1" ]; then
+        echo "Exiting due to error"
+    else
+        echo "Exiting due to error: $*"
+    fi
+    exit 1
+}
+
+if [ "$1" != '-y' ]; then
+	echo -n "CONTINUE? [y/N]"
+	read
+	if [[ ! "$REPLY" =~ ^(yes|y|Y)$ ]]; then
+		echo "Canceled."
+		exit 0
+	fi
+fi
+
+echo "Continuing..."
+# check init system (technique borrowed from raspi-config):
+info FAN 'Checking init system...'
+if command -v systemctl > /dev/null && systemctl | grep -q '\-\.mount'; then
+  echo "Found systemd, OK!"
+elif [ -f /etc/init.d/cron ] && [ ! -h /etc/init.d/cron ]; then
+  bail "Found sysvinit, but we require systemd"
+else
+  bail "Unrecognised init system"
+fi
+
+info FAN 'Adding adafruit_fan.service'
+cat > /etc/systemd/system/adafruit_fan.service <<EOF
+[Unit]
+Description=Fan service for some Adafruit boards
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStartPre=-/bin/bash -c 'echo 4 >/sys/class/gpio/export'
+ExecStartPre=/bin/bash -c 'echo out >/sys/class/gpio/gpio4/direction'
+ExecStart=/bin/bash -c 'echo 1 >/sys/class/gpio/gpio4/value'
+
+RemainAfterExit=true
+ExecStop=/bin/bash -c 'echo 0 >/sys/class/gpio/gpio4/value'
+StandardOutput=journal
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+info FAN 'Enabling adafruit_fan.service'
+sudo systemctl enable adafruit_fan.service
+sudo systemctl start adafruit_fan.service
+info FAN 'Done!'
+echo "You can stop the fan service with 'sudo systemctl stop adafruit_fan.service'"
+echo "You can start the fan service with 'sudo systemctl start adafruit_fan.service'"