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Pool Automation: Prototype Reading pH and ORP Sensors
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Prototype of a system we built that uses several sensors and other hardware to monitor and maintain the correct pool water chemistry.
Some of the readings aren't perfect because I didn't calibrate the sensors correctly and the measurements weren't corrected for temperature.
The system currently contains the following:
- mbed LPC1768 micro-controller
- LCD
- Sensor board with:
- TTL level serial mux/demux chip
- Two sensor circuits and BNC connectors.
- ULN2803A IC to drive a couple of solenoid valves.
- Power to the board is supplied by either USB or 5V through barrel connector.
- 12V power circuit for solenoid valves
Some of the readings aren't perfect because I didn't calibrate the sensors correctly and the measurements weren't corrected for temperature.
The system currently contains the following:
- mbed LPC1768 micro-controller
- LCD
- Sensor board with:
- TTL level serial mux/demux chip
- Two sensor circuits and BNC connectors.
- ULN2803A IC to drive a couple of solenoid valves.
- Power to the board is supplied by either USB or 5V through barrel connector.
- 12V power circuit for solenoid valves
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