Arduino and GY_21P sensor data to Thingspeak example
In this example we connect an Ethernet shield to an Arduino, we then connect a GY-21P sensor to this and we will send the values to Thingspeak
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SI7021
Wemos Lolin 32 ESP32 module and GY-21P module
The GY-21P is a module in that combines a BMP280 sensor and an SI7021 sensor. The on-board BMP280+SI7021 sensor measures atmospheric pressure from 30kPa to 110kPa as well as relative humidity and temperature.
Linkit one and SI7021 Humidity and Temperature Sensor example
The Si7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C Interface.