Control system
The control system can be used to control a value like the temperature in a case. In this example it will cool a case containing e.g a Raspberry Pi or a 3D-Printer.
It isn't an on/off neither a PID-control, it uses the fuzzy logic idea with the goal to simplify the setup and the fine-tuning.
The setpoint (target) is defined by the value hot = 28 and cool = 26, the actual setpoint is the average value = 27.
The input is the temperature from a ds1820 sensor and the output controls a fan [0-100].
{
"currentState": "running",
"states": {
"stopped": {
"on": "running"
},
"running": {
"off": "stopped"
}
},
"data": {
"hot": 28,
"cool": 26,
"min": 0,
"max": 100
},
"methods": {
"on": [
"sm.fill = 'green';",
"sm.text = 'on';",
"output = false;"
],
"off": [
"sm.fill = 'grey';",
"sm.text = 'off';",
"output = false;"
],
"setHot": [
"sm.data.hot = msg.payload;",
"sm.fill = 'grey';",
"sm.text = 'hot = '+sm.data.hot;"
],
"setCool": [
"sm.data.cool = msg.payload;",
"sm.fill = 'grey';",
"sm.text = 'cool = '+sm.data.hot;"
],
"default": [
"if(sm.currentState === 'running') {",
" sm.temp = Math.round(msg.payload*10)/10;",
" if(msg.payload > sm.data.hot) {",
" msg.payload = sm.data.max;",
" sm.fill = 'yellow';",
" } else if (msg.payload < sm.data.cool) {",
" msg.payload = sm.data.min;",
" sm.fill = 'blue';",
" } else {",
" sm.inr = sm.data.hot - sm.data.cool;",
" sm.outr = sm.data.max - sm.data.min;",
" sm.rel = msg.payload - sm.data.cool;",
" msg.payload = Math.round(sm.rel * sm.outr / sm.inr);",
" sm.fill = 'green';",
" }",
" sm.text = 'temp '+sm.temp+' [ '+sm.data.cool+'-'+sm.data.hot+' ] pwm '+msg.payload;",
" output = true;",
"} else {",
" sm.fill = 'grey';",
" sm.text = 'off';",
" output = false",
"}"
],
"status": {
"fill": {
"get": "sm.fill"
},
"shape": "dot",
"text": {
"get": "sm.text;"
}
}
}
}
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