MySensors sketch to Monitor an oil fired boiler & Tune boiler water temperature based on External temperature provided by Mysensors controller
Fuel Sensor V2.0 - Diving91 - 2016
Mysensors Library used : 2.0.0-beta
Repeater Mode : NO
Power Supply : From Mains, No Battery
HW type : Arduino Pro Mini 3.3V 8MHz
Node Name : Fuel Sensor
Purpose : Monitoring of an oil fired boiler & Tune boiler water temperature based on External temperature provided by the controller
Description
When boiler starts, Fuel Valve ON info is sent to the controller and time counter is started. A LED_PIN is set to HIGH
When Boiler stops,
- LED_PIN is set to LOW
- Fuel Valve OFF info is sent to the controller
- Fuel volume is computed, stored to EEPROM (in milli liters) in a circular buffer and sent to the controller (in liters)
- Sketch requests External temperature value to the controller, and compare it to HighTemp, LowTemp threshold values, and set RELAY_PIN based on this comparison
The controller can perform 3 actions
- Reset Fuel volume: The sketch will set volume to 0, request UTC time and send back LOCALE (GMT+1 Europe DST) time to the controller
- Set HighTemp threshold: The sketch stores it in EEPROM and send it back to controller
- Set LowTemp threshold: The sketch stores it in EEPROM and send it back to controller
The RELAY_PIN is used to set boiler water temperature to 2 predetermined values (depends on your boiler characteritics)
Eg: When External temperature > 5.0°C, boiler water temperature of 65°C is enough
Eg: When External temperature < -1.0°C, boiler water temperature of 70°C or 72°C is better
Usage
- When starting the node, take care the boiler is OFF as this is what the sketch assumes
- Fuel Boiler valve is ON when VALVE_PIN is LOW
- Boiler Temperature HIGH when RELAY_PIN is LOW
- Before first usage, erase EEPROM with 0xFF
- At first usage Reset Fuel volume Counter and Send HighTemp & LowTemp Values
- At power on or after reset, Relay is set for LowTemp mode ie Summer conditions
- At power on or after reset, the sketch sends to controller stored values for Fuel Volume, HighTemp, LowTemp, so that the controller is initialized
- A DBG_PIN is used to determine at power on, if sketch debug information has to be sent on serial console or not
- debug info from MySensors are controller at sketch compile time, not during run time
V2.0 Addition :
- Add ability to send volume in its seconds equivalent to let Controllers do the conversion when desired
- Add some wait() during presentation for better reliability
- Some bug fixes
- Add 1-wire DS18B20 sensors reading and sending to Mysensors - Values are sent every custom defined time with & without redundancy
- To be used with 2 sensors to monitor Water temperature out & in from the water path
- When returning water temperature is too high, this indicates your Boiler water temperature might be too high
- If no DS18B20 devices are attached, info is not presented to Mysensors controller
