I2c scanner

Introduction

GY-91 and many other Arduino digital sensors use I2c protocol to send the data using digital protocols.

Theory

The Scanner from IDE

Output of the scanner

From Arduino IDE find “File → Examples → Wire → i2c_scanner”. Using that script, you can find out what I2C devices are connected to your Arduino Board.

I have connected the GY-91 sensor which has

• MPU 9250 sensor and
• BMP280 sensor.

The other address 0x68 is for the other sensor and the other 0x76 is for the other sensor.

References

• Two arduinos as master and slave: https://www.instructables.com/Arduino-and-I2C/
• https://dronebotworkshop.com/i2c-arduino-arduino/