BME280 Temperature and Humidity Sensor

What the BME280 Measures

1. Temperature

Measures air temperature, BME280 Temperature and Humidity Sensor

• Range: −40°C to +85°C
• Accuracy: about ±1°C

Uses:

• Weather stations
• Room monitoring
• HVAC systems
• Greenhouses

2. Humidity

Measures relative humidity (RH).

• Range: 0–100% RH
• Accuracy: about ±3% RH

Uses:

• Smart homes
• Indoor air quality
• Agriculture
• Storage monitoring

3. Air Pressure

Measures atmospheric pressure.

• Range: 300–1100 hPa

Uses:

• Weather forecasting
• Altitude estimation
• Drone projects
• GPS improvement

Why Pressure Helps Estimate Altitude

Air pressure decreases with height.

Example:

• Sea level → higher pressure
• Mountain → lower pressure

The BME280 can estimate altitude using pressure readings.

Approximate formula:

Altitude ↑  => Pressure ↓

Main Advantages

Very Low Power

The BME280 consumes very little current.

Good for:

• Battery projects
• Solar-powered IoT
• Wireless sensors

Small Size

The actual chip is extremely tiny.

Most people buy it on a breakout board like:

• GY-BME280
• CJMCU-BME280