**Solar Powered, pH/ORP/Temp sensor **
This Sensor will help you to monitor the main parameters of your swimming pool.
To avoid replacing the batteries so often, a rechargeable Li-Ion 16850 battery is charged by a small 5V, 100ma, 9x6cm solar panel on top of the case.
Readings are done on every 12min. 5V step-up is connected to D3 pin in order to activate the sensors only during reading cycle.
By using the nice Ceech board, some nice features are available:
- Socket for nRF24L01 and ESP8266
- LTC4079 Charge IC: Quiescent current while charging is 4µA, Ultralow battery drain when charged IBAT < 0.01µA , power source can be any small, 5V - 20V solar cell.
- TPS63031, a 3.3V DC-DC buck-boost converter. low power consumption, efficiency is over 90%, power-save mode, etc.
- 3amp 30V n-channel MOSFET (to switch on the 5V step up and power the pH and ORP sensors).
![enter image description here](https://www.openhardware.io//uploads/59061ff944f656d179dca254/image/Captura de tela 2017-05-01 13.02.02.png "enter image title here")
Sensors
Pin Setup
- A0 - Battery voltage (internal at Ceech's board)
- A1 - ORP sensor (analog)
- A2 - Solar Cell voltage (internal at Ceech's board)
- A3 - pH sensor (analog)
- D5 - One wire bus (for Temp DS18B20 sensor)
- A6 - Charge current (internal at Ceech's board)
- A7 - /CHRG signal from LTC4079 (internal at Ceech's board)
- D3 - MOSFET gate (internal at Ceech's board)
- D7 - CE (internal at Ceech's board)
- D8 - CSN (internal at Ceech's board)
The housing is made by 20cm of PVC 100mm tube, with two caps + rubber rings:
(and some rocks for perfect balance) ;-)