Sensor & System Diagnostics
Connecting...
DEMO DATA ACTIVE: Running in simulated sensor mode on standard computer without physical Raspberry Pi I²C hardware. All readings are clearly marked as
demo.
Hardware Sensor Interface
Checking| Sensor Model: | Bosch Sensortec BMP280 |
| Physical Bus: | I²C Bus 1 (/dev/i2c-1 on Raspberry Pi 3B+) |
| Detected Address: | 0x76 / 0x77 (Default candidate addresses) |
| Measured Quantities: | Temperature (°C) & Atmospheric Pressure (hPa) |
| Relative Humidity: | Not Supported (BMP280 lacks humidity cell) |
| Operating Range: | -40°C to +85°C • 300 to 1100 hPa |
| Absolute Accuracy: | ±0.5°C (Temp) • ±1.0 hPa (Pressure) |
| Last Successful Read: | -- |
| Data Freshness: | -- |
| Consecutive Failures: | 0 |
Runtime Environment & Controls
Demo Mode
Demo mode generates physics-based diurnal temperature and pressure variations on computers without physical Raspberry Pi I²C hardware.
Database Engine: SQLite (WAL Mode)
File Size: -- KB
Total Readings: --
Total Alerts: --
Raspberry Pi 3 Model B+ Pinout & I²C Wiring Reference
| BMP280 Pin | Raspberry Pi Pin | Header Physical Pin | Function |
|---|---|---|---|
| VCC / VIN | 3.3V Power | Physical Pin 1 | Power Supply (+3.3V DC) |
| GND | Ground | Physical Pin 6 | Common Ground (0V) |
| SDA | GPIO 2 (SDA1) | Physical Pin 3 | I²C Data Line |
| SCL | GPIO 3 (SCL1) | Physical Pin 5 | I²C Clock Line |
Hardware Connection Safeguards
- Voltage Warning: Ensure breakout is powered from 3.3V (Pin 1). Direct 5V connection can permanently damage the BMP280 3.3V logic level pins.
- I²C Address Selection: GY-BMP280 modules with SDO tied to GND default to address
0x76. Modules with SDO tied to VCC default to0x77. - Bus Verification: Run
sudo i2cdetect -y 1in Raspberry Pi OS terminal to verify that 76 or 77 is illuminated.