The BME BMP280 is a high-precision, low-power barometric pressure and temperature sensor. It is widely used in weather monitoring, altitude measurement, and environmental sensing applications. The sensor is designed for both I2C and SPI communication, making it versatile and easy to integrate into various microcontroller-based projects.
Common applications include:
This circuit is designed to collect environmental data and light intensity measurements using the ESP32 microcontroller, which communicates with a BME/BMP280 sensor and a BH1750 sensor via I2C, and transmits the data through an LD2410C communication module using serial communication.
Open Project in Cirkit Designer
This circuit features an ESP32 microcontroller interfaced with a BME/BMP280 sensor for environmental monitoring and an MH-Z19B sensor for CO2 measurement, both communicating via I2C (SCL, SDA) and serial (TX, RX) connections respectively. It includes a SIM800L module for GSM communication, connected to the ESP32 via serial (TXD, RXD). Power management is handled by two TP4056 modules for charging 18650 Li-ion batteries via solar panels, with a step-up boost converter to provide consistent voltage to the MH-Z19B, and voltage regulation for the SIM800L. Decoupling capacitors are used to stabilize the power supply to the BME/BMP280 and ESP32.
Open Project in Cirkit Designer
This circuit connects an ESP32 Wroom Dev Kit microcontroller with a BMP280 sensor. The ESP32 provides a 3.3V power supply to the BMP280 and interfaces with it using I2C communication protocol, with GPIO 32 and GPIO 33 serving as the SCL and SDA lines, respectively. The purpose of this circuit is likely to read atmospheric pressure and temperature data from the BMP280 sensor for processing or communication by the ESP32.
Open Project in Cirkit Designer
This circuit connects an ESP32 development board with a BMP280 sensor. The ESP32 provides power to the BMP280 and communicates with it via I2C, using GPIO 22 and GPIO 21 as the serial clock line (SCL) and serial data line (SDA), respectively. The purpose of this circuit is likely to read atmospheric pressure and temperature data from the BMP280 sensor.
Open Project in Cirkit DesignerThe BME BMP280 sensor offers the following key technical details:
| Parameter | Value |
|---|---|
| Operating Voltage | 1.71V to 3.6V |
| Typical Operating Current | 2.7 µA (in normal mode) |
| Communication Interface | I2C (up to 3.4 MHz) / SPI (up to 10 MHz) |
| Pressure Measurement Range | 300 hPa to 1100 hPa |
| Temperature Measurement Range | -40°C to +85°C |
| Pressure Resolution | 0.16 Pa |
| Temperature Resolution | 0.01°C |
| Operating Temperature | -40°C to +85°C |
The BME BMP280 sensor typically comes in a breakout board format. Below is the pin configuration:
| Pin Name | Description |
|---|---|
| VCC | Power supply (1.71V to 3.6V) |
| GND | Ground |
| SCL | Serial Clock Line for I2C / SPI Clock |
| SDA | Serial Data Line for I2C / SPI Data |
| CS | Chip Select for SPI (active low) |
| SDO | Serial Data Output for SPI / I2C Address Bit |
The BME BMP280 can be easily connected to an Arduino UNO using the I2C interface. Below is the wiring guide:
| BME BMP280 Pin | Arduino UNO Pin |
|---|---|
| VCC | 3.3V |
| GND | GND |
| SCL | A5 (SCL) |
| SDA | A4 (SDA) |
The following example demonstrates how to read temperature and pressure data from the BME BMP280 using the Adafruit BMP280 library.
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
// Create an instance of the BMP280 sensor
Adafruit_BMP280 bmp;
// Define sea level pressure in hPa for altitude calculation
#define SEALEVELPRESSURE_HPA (1013.25)
void setup() {
Serial.begin(9600);
// Initialize the BMP280 sensor
if (!bmp.begin(0x76)) {
// Check if the sensor is connected at I2C address 0x76
Serial.println("Could not find a valid BMP280 sensor, check wiring!");
while (1); // Halt execution if sensor is not found
}
}
void loop() {
// Read and print temperature
Serial.print("Temperature = ");
Serial.print(bmp.readTemperature());
Serial.println(" °C");
// Read and print pressure
Serial.print("Pressure = ");
Serial.print(bmp.readPressure());
Serial.println(" Pa");
// Calculate and print altitude
Serial.print("Approx. Altitude = ");
Serial.print(bmp.readAltitude(SEALEVELPRESSURE_HPA));
Serial.println(" m");
Serial.println();
delay(2000); // Wait 2 seconds before the next reading
}
0x76. If the SDO pin is connected to VCC, the address changes to 0x77.SEALEVELPRESSURE_HPA for your location.Sensor Not Detected:
Incorrect Readings:
Altitude Readings Are Inaccurate:
SEALEVELPRESSURE_HPA value in the code to match your local sea level pressure.Q: Can the BME BMP280 measure humidity?
A: No, the BMP280 measures only temperature and pressure. For humidity measurements, use the BME280 sensor.
Q: Can I use the BMP280 with a 5V microcontroller?
A: Yes, but you must use a logic level shifter for the I2C or SPI lines, as the BMP280 operates at 3.3V logic levels.
Q: How do I switch between I2C and SPI modes?
A: The communication mode is determined by the wiring. For I2C, connect the CS pin to VCC. For SPI, connect the CS pin to the microcontroller's GPIO pin and configure it in your code.
By following this documentation, you can effectively integrate the BME BMP280 sensor into your projects for accurate environmental sensing.