Design with SparkFun Atmospheric Sensor Breakout - BME280 in Cirkit DesignerThe SparkFun Atmospheric Sensor Breakout - BME280 is a high-precision sensor module that can measure temperature, humidity, and barometric pressure. This breakout board is based on the Bosch BME280 sensor and is ideal for environmental sensing in weather stations, home automation systems, and IoT applications. Its small form factor and low power consumption make it suitable for portable and battery-powered devices.
This circuit features an ESP32 microcontroller interfaced with an Adafruit BME280 sensor for environmental data acquisition and a SparkFun OpenLog for data logging. The ESP32 communicates with the BME280 via I2C and with the OpenLog via UART, while all components share common power and ground connections.
Open Project in Cirkit Designer
This circuit is designed for environmental data collection and logging, utilizing an Adafruit Feather M0 Express microcontroller as the central processing unit. It interfaces with a BME280 sensor for atmospheric temperature, humidity, and pressure measurements, an SGP30 sensor for monitoring air quality (eCO2 and TVOC), and a STEMMA soil sensor for detecting soil moisture and temperature. The system is powered by a solar panel and a 3.7v LiPo battery, managed by an Adafruit BQ24074 Solar-DC-USB Lipo Charger, and provides easy access to the microcontroller's connections through an Adafruit Terminal Breakout FeatherWing.
Open Project in Cirkit Designer
This circuit is a smart weather station that uses an ESP32 microcontroller to interface with a BME280 sensor for measuring temperature, humidity, and pressure, a BH1750 sensor for measuring light intensity, and a 0.96" OLED display to show the sensor readings. Additional components include a wind vane and a soil moisture module for environmental monitoring, all powered by a 18650 Li-ion battery managed by a TP4056 charging module.
Open Project in Cirkit Designer
This circuit is a smart weather station that uses an ESP32 microcontroller to interface with a BME280 sensor for measuring temperature, humidity, and pressure, a BH1750 sensor for measuring light intensity, and a 0.96" OLED display for showing the sensor readings. Additional sensors include a wind vane, rain sensor, and soil moisture sensor, with a relay module controlling a pump and solenoid valve for potential irrigation control.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | GND | Ground connection |
| 2 | VCC | Supply voltage (1.71 V to 3.6 V) |
| 3 | SDA | I2C Data / SPI Data Input (MOSI) |
| 4 | SCL | I2C Clock / SPI Clock Input |
| 5 | CSB | SPI Chip Select (active low) |
| 6 | SDO | SPI Data Output (MISO) / I2C Address Select |
To use the BME280 sensor with an Arduino UNO, follow these steps:
Below is an example of how to read data from the BME280 sensor using the I2C interface with an Arduino UNO. This code assumes the use of the Adafruit BME280 library.
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
Adafruit_BME280 bme; // I2C
void setup() {
Serial.begin(9600);
if (!bme.begin(0x76)) { // Address 0x76 can be changed by connecting SDO to GND
Serial.println("Could not find a valid BME280 sensor, check wiring!");
while (1);
}
}
void loop() {
Serial.print("Temperature = ");
Serial.print(bme.readTemperature());
Serial.println(" *C");
Serial.print("Pressure = ");
Serial.print(bme.readPressure() / 100.0F);
Serial.println(" hPa");
Serial.print("Humidity = ");
Serial.print(bme.readHumidity());
Serial.println(" %");
delay(2000); // Delay between measurements
}
Q: Can the BME280 sensor measure altitude? A: Yes, the sensor can estimate altitude based on the barometric pressure reading.
Q: How do I change the I2C address of the sensor? A: The I2C address can be changed by connecting the SDO pin to GND or VCC. The default is 0x77, and connecting SDO to GND changes it to 0x76.
Q: Is the sensor waterproof? A: No, the BME280 sensor is not waterproof and should be protected from moisture and condensation.
For further assistance, consult the manufacturer's datasheet and the community forums dedicated to the SparkFun Atmospheric Sensor Breakout - BME280.