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#Cheap Heat Pump Controller (CHPC)
<br>
<b>The CHPC a minimal cost Heat Pump (HP) controller, which can be used as provided, or can be adopted to nearly all use cases due to open source nature.<b>
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Uploading and description in progress, your interest and comments will make progress faster )
<br>
###<b>Applications:</b>
###<b>1. Thermostat.</b>
_Brief_: <b>Precision thermostat.</b> Simple and cheap. Only 1 relay and 1 temperature sensor required.
_Application examples:_ Room heat control. Chicken coop climate control. Distillation column or Yogurt maker temperature control.
###<b>2. Heat pump (HP) controller.</b>
_Brief_: <b> Heat pump controler.</b> Controller drives HP system components: compressor, Cold and Hot side Circulating Pumps (CP). Protects system from overload, overheat and freezing up. Drives EEV\* to optimize HP running conditions.
_Application examples:_ DIY heat pump system. Repair module for commercial system.
Water heater, house heating systems and same.
_Available protections_: Compressor: cold start or overheat. Discharge and suction lines protection. Short-term power loss. Anti-freeze. Power overload protection. Others.
\* under development
For more information about Heap Pumps look at [Wikipedia about HP](https://en.wikipedia.org/wiki/Heat_pump)
<br>
###<b>Control interfaces:</b>
<b>None:</b> Target temperature uploaded to board with firmware and cannot be changed. System used as fixed thermostat. Target temperature can be changed later with firmware re-upload.
<b>0.96 OLED or 1602 LCD screen + buttons:</b> Simple, local screen controlled system. Remote control is not possible.
<b>Remote computer terminal over RS-485 line. </b> Target temperature and running conditions under remote control. User can get stats from all T sensors. Up to 1.2 kilometer line.\*
<b> Remote automated control/stats via RS-485.</b> Firmware was written with python scripting in mind (and real scripts at prototype 485 network).
\* RS-485 specification. Hardware test succeeded on 400 meters line.
<br>
###<b>Relays:</b>
###<b>"Thermostat"</b>:
Only 1 Relay: drives electric heater (any)
###<b>Heat Pump.</b> Capillary tube, TXV, EEV:
5 Relays, drives all you need:
* Compressor (can be used as external relay driver for High Power systems)
* Cold Circulating Pump (CP)
* Hot CP
* Sump Heater (optional, recommended for outdoor HP installations)
* 4-way Valve (support coming up: autumn 2019)
###<b>Temperature sensors:</b>
* Up to 13 temperature sensors can be connected to CHPC to control all processes that you want.
* Only 1 sensor needed for "Thermostat" or "Heat Pump capillary/TXV"
* 3 sensors needed for "HP with EEV" (absolute minimum scheme)
<br>
### CHPC: Cheap Heat Pump Controller v1.0
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