BMP180

Connects over

I²C

Address

0x77

Made by

Bosch Sensortec

Datasheet

cdn-shop.adafruit.com

Use it

hardware {
    device bmp180: BMP180
}

every 1s {
    let value: float = bmp180.temperature()
    log("bmp180", "temperature={value}")
}

On its own, the declaration puts the BMP180 on the first I²C bus (SDA 21, SCL 22 on the ESP32) at 0x77. To choose the pins or the address, declare the bus and attach the device: device bmp180: BMP180 on i2c0 at 0x77 with i2c i2c0(sda: 21, scl: 22).

Methods

• bmp180.temperature() -> float

  Temperature in °C

• bmp180.pressure() -> float

  Pressure in hPa

Wiring

Specifications

Voltage

1.8V – 3.6V (most breakouts include a 5V regulator)

Current

5 μA at 1 Hz

Temp

−40°C to +85°C ±2°C

Pressure

300 – 1100 hPa ±0.12 hPa (≈ ±1 m altitude)

Tips

• Older sensor — has been replaced by BMP280/BME280 in new designs.
• Address is fixed at 0x77 — can't have two on one bus without a multiplexer.
• No humidity — pair with HTU21D / AHT20 if you need it.

Alternatives worth knowing:

• BMP280: Newer, lower power, smaller. Same role.
• BME280: Same as BMP280 + humidity in one chip.