Read and display the water flow sensor on Blynk

In this activity, we will be reading and displaying the water flow meter on blynk using NodeMCU.

What will you need?

• NodeMCU with USB cable

• Water Flow Sensor

• Relay Switch

• Blynk App

Setting up the circuit

Connecting the water flow sensor to the NodeMCU (https://github.com/pkarun/Blynk-Flow-Sensor-Water-Meter)

1. Connect the yellow wire from the water flow sensor to pin D2 of the NodeMCU board.

2. Connect the black wire to the ground pin of the NodeMCU. Connect the red wire to the 3.3V pin.

3. Download and install the Blynk app to your smartphone. Open the app and set up a New Project. The authentication key will be sent to you via the email that you used to register the Blynk app.