15Dec
ESP32 with BMP180 Pressure & Temperature Sensor
BMP180 Sensor: Digital Barometric Pressure Sensor
The BMP180 is a digital barometric pressure sensor developed by Bosch Sensortec. It is commonly used in weather stations, altimeters, and GPS navigation systems. It can measure atmospheric pressure, temperature, and estimate altitude.
🔧 Key Features
| Feature | Description |
|---|---|
| Pressure Range | 300 to 1100 hPa (hectopascal) |
| Temperature Range | 0 to 65°C |
| Altitude Resolution | ~0.17 meters |
| Interface | I²C (default), also supports SPI |
| Supply Voltage | 1.8V to 3.6V |
| Low Power | Ideal for battery-operated devices |
| Size | Very compact (3.6 x 3.8 x 0.93 mm package) |
🧠 How It Works
1. Pressure Measurement
- The sensor has a piezo-resistive element which changes resistance with pressure.
- A built-in ADC (analog-to-digital converter) digitizes this analog signal.
- Compensation algorithms (from Bosch) correct for temperature and calibration offsets.
2. Temperature Measurement
- A temperature sensor is built in to help with pressure compensation and also provides ambient temperature.
🔌 Connections (I²C Mode)
| BMP180 Pin | Arduino/ESP32 Pin |
|---|---|
| VCC | 3.3V |
| GND | GND |
| SDA | SDA (A4 on Uno) |
| SCL | SCL (A5 on Uno) |
📦 Typical Applications
- Weather monitoring stations
- GPS devices (for altitude correction)
- Drones and quadcopters (altitude hold)
- Smartphones and wearable tech
- Hiking and climbing gear
HOW TO OPERATE
#include <Wire.h>
#include <Adafruit_BMP085.h>
Adafruit_BMP085 bmp;
void setup() {
Serial.begin(9600);
if (!bmp.begin()) {
Serial.println("BMP180 not detected!");
while (1) {}
}
}
void loop() {
Serial.print("Temperature = ");
Serial.print(bmp.readTemperature());
Serial.println(" *C");
Serial.print("Pressure = ");
Serial.print(bmp.readPressure());
Serial.println(" Pa");
Serial.print("Altitude = ");
Serial.print(bmp.readAltitude());
Serial.println(" m");
delay(2000);
}
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