RPI Cooling fan control

[affinite]

Updated flow to incorporate basic PWM fan speed control
Just change values in the "PWM Fan control" function node to configure temperature thresholds

Code:

[{"id":"d3940991.1a2ef8","type":"inject","z":"2b47cf3c.1f345","name":"","topic":"","payload":"","payloadType":"date","repeat":"10","crontab":"","once":false,"x":110,"y":180,"wires":[["1b8455a0.d1cbfa"]]},{"id":"1b8455a0.d1cbfa","type":"exec","z":"2b47cf3c.1f345","command":"vcgencmd measure_temp","addpay":false,"append":"","useSpawn":"","timer":"","oldrc":false,"name":"Read RPi Temp.","x":300,"y":180,"wires":[["c9389a57.3c92b8"],[],[]]},{"id":"c9389a57.3c92b8","type":"function","z":"2b47cf3c.1f345","name":"Convert to Number","func":"str = msg.payload\nmsg.payload = str.substring(5,9);\nmsg.payload = Number(msg.payload);\nreturn msg;","outputs":1,"noerr":0,"x":510,"y":180,"wires":[["dca36c2e.25785","d44efe8e.eccc7","e2829e61.1dca8"]]},{"id":"dca36c2e.25785","type":"ui_gauge","z":"2b47cf3c.1f345","name":"","group":"3067d01a.af5d4","order":2,"width":0,"height":0,"gtype":"gage","title":"CPU Temperature","label":"C","format":"{{value}}","min":0,"max":"100","colors":["#00b500","#e6e600","#ca3838"],"seg1":"60","seg2":"65","x":770,"y":60,"wires":[]},{"id":"d44efe8e.eccc7","type":"ui_chart","z":"2b47cf3c.1f345","name":"","group":"2381998f.63b6d6","order":0,"width":0,"height":0,"label":"chart","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","ymin":"","ymax":"","removeOlder":"3","removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"x":730,"y":120,"wires":[[],[]]},{"id":"e2829e61.1dca8","type":"function","z":"2b47cf3c.1f345","name":"PWM Fan Control","func":"if(msg.payload <=45) msg.payload = 0;\nelse if(msg.payload >45 && msg.payload <=55) msg.payload = 30;\nelse if(msg.payload >55 && msg.payload <=60) msg.payload = 50;\nelse if(msg.payload >60 && msg.payload <=65) msg.payload = 75;\nelse if(msg.payload >65) msg.payload = 100;\nreturn msg;","outputs":1,"noerr":0,"x":770,"y":180,"wires":[["84179128.fd722"]]},{"id":"84179128.fd722","type":"rpi-gpio out","z":"2b47cf3c.1f345","name":"Fan Control","pin":"12","set":false,"level":"1","freq":"","out":"pwm","x":990,"y":180,"wires":[]},{"id":"3ae31bf5.f57c24","type":"ui_switch","z":"2b47cf3c.1f345","name":"Fan Override","label":"Fan Override","group":"693e1549.6d363c","order":0,"width":"3","height":"1","passthru":true,"decouple":"false","topic":"","style":"","onvalue":"100","onvalueType":"num","onicon":"","oncolor":"","offvalue":"0","offvalueType":"num","officon":"","offcolor":"","x":750,"y":240,"wires":[["84179128.fd722"]]},{"id":"3067d01a.af5d4","type":"ui_group","z":"","name":"Col1","tab":"7ae3bc3.4c07544","order":1,"disp":false,"width":"3"},{"id":"2381998f.63b6d6","type":"ui_group","z":"","name":"Temp Chart","tab":"8b537ae0.9e5938","disp":true,"width":"10"},{"id":"693e1549.6d363c","type":"ui_group","z":"","name":"Col3","tab":"7ae3bc3.4c07544","order":3,"disp":false,"width":"3"},{"id":"7ae3bc3.4c07544","type":"ui_tab","z":"","name":"RPi Control","icon":"dashboard","order":4},{"id":"8b537ae0.9e5938","type":"ui_tab","z":"","name":"CPU Temp","icon":"dashboard","order":5}]