I have 2 brewpi Spark 2 units. Both are configured exactly the same, both controlling identical 7 gallon SS Brewtech fermenters. The heat on one is consistently failing to meet target. On my last brew, it was missing by about a degree. At first I thought it might be the heating pad but its able to maintain higher temps, it just never actually meets target. The one thing I noticed is that the Duty Cycle on Heater 1 is 0 on the “good” one and 36.something on the bad, but there’s no setting for this. Any suggestions on troubleshooting?
Here’s a beer I’m brewing right now. Very tightly controlled. Not sure what caused that drop, but it might have been because I reused an old profile and moved some dates around. Also, yes, I did some manual edits to the html to put labels on the log probes. And yes, my basement gets that cold.
And this is just 5 gallons of Starsan I’m playing with. As you can see its obviously able to hit higher temps than it was maintaining before the ramp.
This is the good control algorithm
{
"kind": "Control",
"pids": [
{
"kind": "Pid",
"name": "heater1pid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorFallback",
"onBackupSensor": true,
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 16.75,
"connected": true,
"address": "28D1FB030900003D",
"settings.calibrationOffset": 0
}
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "fridgeset",
"value": 16.668
}
},
"output": {
"kind": "ActuatorPwm",
"dutySetting": 0,
"period": 4,
"minVal": 0,
"maxVal": 100,
"target": {
"kind": "ActuatorMutexDriver",
"mutexGroup": {
"kind": "ActuatorMutexGroup",
"deadTime": 1800000,
"waitTime": 1016134
},
"target": {
"kind": "ActuatorDigitalDelegate",
"name": "heater1",
"delegate": {
"state": 0,
"kind": "ActuatorPin",
"pin": 25,
"invert": false
}
}
}
},
"inputError": 0.0508,
"Kp": 60,
"Ti": 3600,
"Td": 120,
"p": -3.0469,
"i": 0,
"d": -0.2344,
"actuatorIsNegative": false
},
{
"kind": "Pid",
"name": "heater2pid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer2",
"delegate": {
"kind": "TempSensorDisconnected",
"value": null,
"connected": false
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "beer2set",
"value": null
}
},
"output": {
"kind": "ActuatorPwm",
"dutySetting": 0,
"period": 4,
"minVal": 0,
"maxVal": 100,
"target": {
"kind": "ActuatorMutexDriver",
"mutexGroup": {
"kind": "ActuatorMutexGroup",
"deadTime": 1800000,
"waitTime": 1016131
},
"target": {
"kind": "ActuatorDigitalDelegate",
"name": "heater2",
"delegate": {
"kind": "ActuatorNop",
"state": 0
}
}
}
},
"inputError": null,
"Kp": 10,
"Ti": 600,
"Td": 60,
"p": 0,
"i": 0,
"d": 0,
"actuatorIsNegative": false
},
{
"kind": "Pid",
"name": "coolerpid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorFallback",
"onBackupSensor": true,
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 16.75,
"connected": true,
"address": "28D1FB030900003D",
"settings.calibrationOffset": 0
}
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "fridgeset",
"value": 16.668
}
},
"output": {
"kind": "ActuatorPwm",
"dutySetting": 1.1641,
"period": 120,
"minVal": 0,
"maxVal": 100,
"target": {
"kind": "ActuatorMutexDriver",
"mutexGroup": {
"kind": "ActuatorMutexGroup",
"deadTime": 1800000,
"waitTime": 1016127
},
"target": {
"kind": "ActuatorTimeLimited",
"minOnTime": 10,
"minOffTime": 0,
"maxOnTime": 65535,
"state": 0,
"target": {
"kind": "ActuatorDigitalDelegate",
"name": "cooler",
"delegate": {
"state": 0,
"kind": "ActuatorPin",
"pin": 24,
"invert": false
}
}
}
}
},
"inputError": 0.0508,
"Kp": 10,
"Ti": 3600,
"Td": 120,
"p": -0.5078,
"i": -0.6172,
"d": -0.0391,
"actuatorIsNegative": true
},
{
"kind": "Pid",
"name": "beer2fridgepid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 16.75,
"connected": true,
"address": "28D1FB030900003D",
"settings.calibrationOffset": 0
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "beer1set",
"value": 16.668
}
},
"output": {
"kind": "ActuatorOffset",
"target": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorFallback",
"onBackupSensor": true,
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 16.75,
"connected": true,
"address": "28D1FB030900003D",
"settings.calibrationOffset": 0
}
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "fridgeset",
"value": 16.668
}
},
"reference": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 16.75,
"connected": true,
"address": "28D1FB030900003D",
"settings.calibrationOffset": 0
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "beer1set",
"value": 16.668
}
},
"useReferenceValue": false,
"setting": 0,
"achieved": 0.082,
"minimum": 0,
"maximum": 0
},
"inputError": 0.0508,
"Kp": 0,
"Ti": 0,
"Td": 0,
"p": 0,
"i": 0,
"d": 0,
"actuatorIsNegative": false
}
]
}and the “bad”
{
"kind": "Control",
"pids": [
{
"kind": "Pid",
"name": "heater1pid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorFallback",
"onBackupSensor": true,
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 17.75,
"connected": true,
"address": "283836030900004C",
"calibrationOffset": 0
}
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "fridgeset",
"value": 18.332
}
},
"output": {
"kind": "ActuatorPwm",
"dutySetting": 36.1094,
"period": 4,
"minVal": 0,
"maxVal": 100,
"target": {
"kind": "ActuatorMutexDriver",
"mutexGroup": {
"kind": "ActuatorMutexGroup",
"deadTime": 1800000,
"waitTime": 1754748
},
"target": {
"kind": "ActuatorDigitalDelegate",
"name": "heater1",
"delegate": {
"kind": "ActuatorPin",
"state": false,
"pin": 25,
"invert": false
}
}
}
},
"inputError": -0.5664,
"Kp": 60,
"Ti": 3600,
"Td": 120,
"p": 33.9844,
"i": 4,
"d": -1.875,
"actuatorIsNegative": false
},
{
"kind": "Pid",
"name": "heater2pid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer2",
"delegate": {
"kind": "TempSensorDisconnected",
"value": null,
"connected": false
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "beer2set",
"value": null
}
},
"output": {
"kind": "ActuatorPwm",
"dutySetting": 0,
"period": 4,
"minVal": 0,
"maxVal": 100,
"target": {
"kind": "ActuatorMutexDriver",
"mutexGroup": {
"kind": "ActuatorMutexGroup",
"deadTime": 1800000,
"waitTime": 1754745
},
"target": {
"kind": "ActuatorDigitalDelegate",
"name": "heater2",
"delegate": {
"kind": "ActuatorNop",
"state": false
}
}
}
},
"inputError": null,
"Kp": 10,
"Ti": 600,
"Td": 0,
"p": 0,
"i": 0,
"d": 0,
"actuatorIsNegative": false
},
{
"kind": "Pid",
"name": "coolerpid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorFallback",
"onBackupSensor": true,
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 17.75,
"connected": true,
"address": "283836030900004C",
"calibrationOffset": 0
}
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "fridgeset",
"value": 18.332
}
},
"output": {
"kind": "ActuatorPwm",
"dutySetting": 0,
"period": 120,
"minVal": 0,
"maxVal": 100,
"target": {
"kind": "ActuatorMutexDriver",
"mutexGroup": {
"kind": "ActuatorMutexGroup",
"deadTime": 1800000,
"waitTime": 1754742
},
"target": {
"kind": "ActuatorTimeLimited",
"minOnTime": 10,
"minOffTime": 0,
"maxOnTime": 65535,
"state": false,
"target": {
"kind": "ActuatorDigitalDelegate",
"name": "cooler",
"delegate": {
"kind": "ActuatorPin",
"state": false,
"pin": 24,
"invert": false
}
}
}
}
},
"inputError": -0.5664,
"Kp": 10,
"Ti": 3600,
"Td": 120,
"p": 5.6641,
"i": 0,
"d": -0.3125,
"actuatorIsNegative": true
},
{
"kind": "Pid",
"name": "beer2fridgepid",
"enabled": true,
"input": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 17.75,
"connected": true,
"address": "283836030900004C",
"calibrationOffset": 0
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "beer1set",
"value": 18.332
}
},
"output": {
"kind": "ActuatorOffset",
"target": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorFallback",
"onBackupSensor": true,
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 17.75,
"connected": true,
"address": "283836030900004C",
"calibrationOffset": 0
}
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "fridgeset",
"value": 18.332
}
},
"reference": {
"kind": "SensorSetPointPair",
"sensor": {
"kind": "TempSensorDelegate",
"name": "beer1",
"delegate": {
"kind": "OneWireTempSensor",
"value": 17.75,
"connected": true,
"address": "283836030900004C",
"calibrationOffset": 0
}
},
"setPoint": {
"kind": "SetPointSimple",
"name": "beer1set",
"value": 18.332
}
},
"useReferenceValue": false,
"setting": 0,
"achieved": -0.582,
"minimum": 0,
"maximum": 0
},
"inputError": -0.5664,
"Kp": 0,
"Ti": 0,
"Td": 0,
"p": 0,
"i": 0,
"d": 0,
"actuatorIsNegative": false
}
]
}