79 lines
3.8 KiB
Markdown
79 lines
3.8 KiB
Markdown
# BluetoothHeater
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Bluetooth & WiFi interface for Chinese Diesel Heaters
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Requirements
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* Requires "blue wire" compatible heater unit
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* Blue wire interface circuitry - please refer to the hardware design schematics in the wiki for guidance.
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It is important to take note that the blue wire is 5V logic, an ESP32 is 3.3V.
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Level translation is important!
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* ESP32 dev module
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* HC-05 Bluetooth module - preferably exposing the key pin, not power control)
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* DS18B20 one wire temperature sensor
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* 1.3" I2C OLED using SH1106 controller
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* DS3231 Real Time Clock
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* Technical ability to solder SMD components
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* Technical ability to program/flash in the Arduino environement
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Working so far:
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* Power On/Off
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* Temperature + & -
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* Fuel mixture tuning
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* One wire remote temperature sensing (DS18B20)
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* Heat exchanger body temperature, as reported by heater unit
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* I2C Interface to 1.3" SH1106 based OLED for a full featured controller
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* 5 button keypad interface
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* Smart error detection, observes unusual heater state progression (ignition fail)
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* ESP32 with HC-05 Bluetooth
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* JSON based communications between Bluetooth and Wifi apps
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* Bluetooth Connectivity
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* Bluetooth Control App for Android (App Inventor based)
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* WiFi Connection to existing network or Standalone Access Point Mode (Passwd: thereisnospoon)
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* Wifi control
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* DebugPort data sent via Telnet if/when available on the network.
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* 14 timers - including selectable day and repeat functionality
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Simplisticly this allows each day to have 2 individual start stop regimes, but
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a single timer can be set to repeat every day if desired, or on certain days.
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Timers can also be set to be one-shot.
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This is an extremely flexible system!
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* Battery backed Real Time Clock - DS3231
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* Mk1 "Green PCB" using naked ESP32 and HC-05 modules
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* Temperature readout in Celcius or Farenheit
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* Two new experimental thermostat modes (No practical testing - presently too hot in .au!):
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Tighten or loosen the thermostat temperature range by specifying a hysteresis value. eg tell the heater it is 23 degrees when it really is only 22.25 degrees (only 0.25 above set point).
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Request a linear change in Hz according to the deviation from the setpoint
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* 2 external digital inputs, 2 digital outputs, analogue input .This would allow external timer units for example, or analogue temperature demand (which is still only 1 degree resolution with standard heater thermostat).
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* New Mk2 "Red PCB" that properly fits into an off the shelf case (requires machining)
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* Software updates over WiFi:
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Native OTA via espota.exe or espota.py (AP or STA mode)
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Web browser upload new binary to controller (AP or STA mode)
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Direct discovery and download of updates from internet server (STA mode)
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* Factory default menu option
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* "Fuel gauge" - Integrates pump frequency, assumes a repeatable dose of fuel per pump stroke.
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* Low voltage cut out, definable threshold - auto adjusts for cable voltage drop during start
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* Temperature probe offset to correct adverse readings.
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* Hour meter - run time, glow time
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To be implemented
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* 433MHz Rx stream, 433MHz Tx stream connections.
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* MQTT pub/sub
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* Regular Hot Burn cycle (DPF mode!)
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* list under construction.....
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Suggestions
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If you have a burning desire for a feature that you think will useful, please feel free to drop me a line at gitlab@mrjones.id.au.
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Your request will be thoughtfully considered.
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If deemed viable and worthwhile to the greater good it will be added to the "To be implemented list" above and worked on in good time.
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Likewise, if it's really easy to implement, it may make it to "Working So Far" at speed :-)
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Please be aware that this is not my day job, so "good things take time".
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Case for Green PCB
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https://www.thingiverse.com/thing:3398068
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