مخطط الأطراف
مخطط أطراف وحدة الضغط الجوي BMP280 / BME280 (GY-BMP280، I2C/SPI)
الأطراف
- VCC (3.3V ONLY on the 6-pin purple GY-BMP280-3.3: the board carries four 10kΩ pull-ups and a capacitor, no regulator — 5V kills the sensor. The GY-BME280 and most 4-pin boards add an LDO and take 3.3–5V)
- GND
- SCL (I2C clock / SPI SCK)
- SDA (I2C data / SPI MOSI)
- CSB (SPI chip select — pulled high on the board, so leave it unconnected for I2C)
- SDO (SPI MISO; in I2C sets the address LSB: GND = 0x76, open/VCC = 0x77 — pulled high on the board, hence 0x77 by default)
المواصفات
| Board supply | GY-BMP280-3.3: 3.3 V only; boards with LDO: 3.3–5 V |
|---|---|
| Chip supply | 1.71–3.6 V |
| الواجهة | I2C (up to 3.4 MHz) or SPI (up to 10 MHz) |
| I2C address | 0x77 (0x76 with SDO to GND) |
| Chip ID | 0x58 (BMP280) / 0x60 (BME280) |
| Pressure range | 300–1100 hPa |
| Pressure accuracy | ±1 hPa absolute, ±0.12 hPa relative (≈±1 m) |
| Temperature range | −40–85 °C |
| Temperature accuracy | ±1 °C (0–65 °C) |
| Humidity (BME280 only) | 0–100 %RH, ±3 %RH |
| Supply current | 2.7 µA (BMP280) / 3.6 µA (BME280) at 1 Hz; 0.1 µA sleep |
| Sensor can | 2.0 × 2.5 mm (BMP280) / 2.5 × 2.5 mm (BME280) |
الملاحظات
- BME280 adds humidity to the BMP280 pressure + temperature. The two boards look identical; the BME280 can is a 2.5 mm square, the BMP280 can is a 2 x 2.5 mm rectangle.
- The pin names are printed on the BACK of the GY-BMP280-3.3 — the component side only shows the four resistors and the can.
