Witty Fox - SI7021 Humidity Temperature Sensor Breakout Board

Witty Fox - SI7021 Humidity Temperature Sensor Breakout Board Documentation

Overview

The Witty Fox - SI7021 Humidity Temperature Sensor Breakout Board is a compact and easy-to-use board designed to measure relative humidity (RH) and temperature. The board is based on the popular SI7021 sensor, which provides high accuracy and reliability in a wide range of environmental conditions.

Technical Specifications

Sensor: SI7021
 Humidity Measurement Range: 0-80% RH
 Temperature Measurement Range: -40C to 125C
 Accuracy:
	+ Humidity: 3% RH
	+ Temperature: 0.5C
 Power Supply: 3.3V or 5V
 Communication Protocol: I2C

Pinout

VCC: Power supply (3.3V or 5V)
 GND: Ground
 SCL: I2C Clock
 SDA: I2C Data

Example Code

### Example 1: Basic Temperature and Humidity Reading using Arduino

This example demonstrates how to read temperature and humidity data from the SI7021 sensor using an Arduino board.
```cpp
#include <Wire.h>

#define SI7021_ADDRESS 0x40

void setup() {
  Serial.begin(9600);
  Wire.begin();
}

void loop() {
  int humidity = readHumidity();
  int temperature = readTemperature();

Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %RH");

Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");

delay(1000);
}

int readHumidity() {
  Wire.beginTransmission(SI7021_ADDRESS);
  Wire.write(0xE5);
  Wire.endTransmission();
  Wire.requestFrom(SI7021_ADDRESS, 2);
  uint8_t humidityMsB = Wire.read();
  uint8_t humidityLsB = Wire.read();
  int humidity = ((humidityMsB << 8) | humidityLsB)  0.04 - 4.0;
  return humidity;
}

int readTemperature() {
  Wire.beginTransmission(SI7021_ADDRESS);
  Wire.write(0xE0);
  Wire.endTransmission();
  Wire.requestFrom(SI7021_ADDRESS, 2);
  uint8_t tempMsB = Wire.read();
  uint8_t tempLsB = Wire.read();
  int temperature = ((tempMsB << 8) | tempLsB)  0.01 - 40.0;
  return temperature;
}
```
### Example 2: Raspberry Pi Python Code for Reading Temperature and Humidity

This example demonstrates how to read temperature and humidity data from the SI7021 sensor using a Raspberry Pi and Python.
```python
import smbus
import time

# Define the I2C bus and SI7021 address
bus = smbus.SMBus(1)
address = 0x40

def read_humidity():
    bus.write_byte(address, 0xE5)
    data = bus.read_i2c_block_data(address, 0x00, 2)
    humidity = (data[0] << 8) | data[1]
    humidity = (humidity  0.04) - 4.0
    return humidity

def read_temperature():
    bus.write_byte(address, 0xE0)
    data = bus.read_i2c_block_data(address, 0x00, 2)
    temperature = (data[0] << 8) | data[1]
    temperature = (temperature  0.01) - 40.0
    return temperature

while True:
    humidity = read_humidity()
    temperature = read_temperature()

print("Humidity: {:.1f} %RH".format(humidity))
    print("Temperature: {:.1f} C".format(temperature))

time.sleep(1)
```
Note: Make sure to install the `smbus` library on your Raspberry Pi using `sudo apt-get install python-smbus` before running the code.

These examples demonstrate the basic usage of the Witty Fox - SI7021 Humidity Temperature Sensor Breakout Board. You can modify the code to suit your specific application requirements.