[ESP32] Water Level Indicator

Parts Used

• ESP32
• HC-SR04 Ultrasonic Sensor
• 5VDC Relay
• Water Pump

Tokens

BLYNK_TEMPLATE_ID

BLYNK_DEVICE_NAME

BLYNK_AUTH_TOKEN

Changes required before using ino file

• Tokens
• GPIO Pins
• TANK_ZERO, TANK_MAX

Blynk Dashboard Setup

1. Go to https://blynk.cloud and create a new account. Log into your account.
2. Create a template named "Water Tank".
3. In the datastream tab create two virtual data streams:

   V0:
   Name: Water Pump Switch
   Data Type: Integer
   

   V4:
   Name: Water Level
   Data Type: Double
   Max: 100
   Units: Percentage
   

4. Go to the web dashboard tab and create a suitable web dashboard. For that, I used a button and one gauge widget.
5. Assign Datastream V4 to guage and V0 to Switch.
6. For Switch, change OFF value to 1 and ON value to 0.
7. Get BLYNK_AUTH_TOKEN token from mail, BLYNK_TEMPLATE_ID and BLYNK_DEVICE_NAME from Info tab in dashboard.

Screenshots

• Web Dashboard: https://i.imgur.com/BMVSPYp.png
• Android App: https://i.imgur.com/LeixN6b.jpeg