A Micropython script that starts monitors when water is passing through a flow meter and send that flow amount in gallons to an MQTT client running on a Raspberry Pi for a van systems dashboard. This uses a GR-301 flow meter but should also work well with the generic YS-201 or most hall effect sensors. The GR-301 has a male 3 wire JST-PH connector on it so I used a female JST connector on some perf board to make a clean installation. An LM2596 dc-dc voltage converter is used to step the 12v house battery voltage down to 5v to power the Pico W.
Clone the repo:
git clone https://github.com/michaelpappas/WATER_TANK_SENSOR
cd WATER_TANK_SENSORReplace the SSID and PASSWORD values with your own wifi network. Modify the "mqtt_server" value for the ip address of the MQTT broker.
Flow meter ground -> pi GND (pin38)
Flow meter VCC -> pi 3v3 (pin36)
Flow meter signal out -> pi GPIO15 (pin20)
Top of board:
Bottom of board:
Board with flow meter:
\ # project directory
|--flowMQTT.py # micropython script for sensing water volume and mqtt
|--readme.md # project readme