This project aims at getting an analog signal from a water meter and use it for a house automatization system to control the water consumption.
The principle is very basic. My water meter has got a silverish arrow which turns 360° each time one liter is consumed.
I just installed a CNY70 reflective sensor so each time the silver arrow pass underneath then a LoRa message is sent to my automation server.
This project uses :
- CNY70 reflective sensor (that includes an infrared emitter and phototransistor)
- Arduino Pro Mini 3.3v, 8Mhz
- Solar Panel
- Update 2020/12/11 : Change TP4056 lithium battery charger model from this one to this one. This new model includes a over-discharge protection.
- RFM95W LoRa Module
- Schema
Available here (locate Water Meter v2 Datasheet) : https://easyeda.com/fguiet/water-meter
Caution : The potentiometer should be adjusted using debug mode. INTERRUPT_PIN should report 1 only when the silver arrow is underneath the CNY70 sensor.
| Timestamp | Raw water meter value | Total liters read from sensor | Real water comsumption | Error in liter |
|---|---|---|---|---|
| 2020/09/20 @ 18h15 | 2177 994 | 0 | 0 | 0 |
| 2020/09/26 @ 10h56 | 2180 397 | 2405 | 2403 | 2 |
See my old project, nothing changed here : https://github.com/fguiet/water-meter
- CNY70 Sensor + custom 3D printed holder on water meter
- The electronic parts in the waterproof box
Proof of concept : some charts
- Water consumption per hour
- Water consumption per day
As you can see, on average, we consume around 400 liter per day (we are 4 in the house).
At the moment, one issue : matthijskooijman/arduino-lmic#293