Making a water level indicator with single LED using AJ-SR04M Ultrasonic Sensor

Requirments

• Ultrasonic Sensor AJ-SR04M
• Node-mcu (0.9 used)
• Node-Red to Easily create Mqtt Pub/Sub Client

Wiring

Node-MCU - AJ-SR04M - LED

• D1 - Trig
• D2 - Echo
• D3 - - - LED(+ve)
• 5V/VU - 5V
• GND - GND - GND

NODE-RED

• MQTT in[/ha/spub] -to- Exit Text Node //To get RAW Distance Data
• Input Text -to- MQTT out[/ha/sred] //Input int Value to Set Distance
• MQTT in[/ha/sred] -to- Exit Text Node //MQTT Out Data
• MQTT in[/ha/limit] -to- Exit Text Node //Defined Limit Distace

Versions and files

Using Arduino and Node-mcu

Ultrasonic_ESP & Ultrasonic_UNO

Using Only Node-mcu

UltraSonic_OnlyESP

Using Only Node-MCU with EEPROM Limit Saving

UltraSonic_OnlyESP_EEPROM

Picture of Node-Red

NODE-MAIN NODE-UI

Picture of Project

MAIN EXTRAS-*