BMP280 Pressure Sensor

Overview

BMP280 is a high-precision pressure/temperature sensor that communicates via I2C bus, capable of measuring atmospheric pressure, ambient temperature, and estimating altitude. Suitable for weather stations, drone altimeters, indoor navigation, and other scenarios.

Firmware Requirement: Requires FASTBEE_ENABLE_I2C_SENSORS=1 and active i2cSensors.

Supported Peripheral Types

Type	type Value	Description
SENSOR	38	I2C sensor (BMP280)

Hardware Wiring

BMP280 Pin	ESP32 GPIO	Description
VCC	3.3V	Power supply
GND	GND	Ground
SDA	GPIO 21	I2C data line
SCL	GPIO 22	I2C clock line

Most BMP280 modules have built-in pull-up resistors; no external pull-up needed.

Configuration

Method 1: Web Interface Configuration (Recommended)

Before saving BMP280 configuration, verify I2C bus, device address, and supply voltage.

Step 1: Navigate to Peripheral Management Page

1. Open a browser and navigate to the ESP32 IP address
2. After logging in, click Peripheral Configuration in the left menu

Step 2: Add BMP280 Peripheral

1. Click the Add Peripheral button

2. Fill in the configuration:

   Field	Value	Description
   Peripheral ID	bmp280_1	Unique identifier
   Name	BMP280 Pressure Sensor	Display name
   Peripheral Type	Generic Sensor (type: 38)	I2C sensor
   SDA Pin	21	I2C data pin
   SCL Pin	22	I2C clock pin
   Driver Name	BMP280	Fixed value
   I2C Address	0x76	0x76 or 0x77
   Sampling Interval	5000	5 seconds (≥2000ms)

3. Click Save

Step 3: Verify Configuration

1. Find the newly added peripheral in the peripheral list
2. Click the Enable toggle
3. Wait 5 seconds and check pressure, temperature, and altitude data

Important: Confirm i2cSensors is active before adding the peripheral.

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Method 2: JSON Configuration File Import

Add the following configuration to the peripherals array in data/config/peripherals.json:

{
  "id": "bmp280_1",
  "name": "BMP280 Pressure Sensor",
  "type": 38,
  "enabled": false,
  "pins": [21, 22],
  "params": {
    "driver": "BMP280",
    "i2cAddress": "0x76",
    "interval": 5000
  }
}

Parameter Description

Parameter	Description
driver	Driver name, fixed to "BMP280"
i2cAddress	I2C address, usually 0x76 (SDO to GND) or 0x77 (SDO to VCC)
interval	Sampling interval (ms), recommend ≥ 2000

pins[0] = SDA pin, pins[1] = SCL pin

Data Report Format

Sensor data is reported via MQTT, containing multiple measurements:

[
  {"id": "bmp280_1", "value": "temperature:25.3,pressure:101325,altitude:10.5"}
]

Field	Description	Unit
temperature	Ambient temperature	°C
pressure	Atmospheric pressure	Pa
altitude	Estimated altitude	m

Driver Registration Mechanism

BMP280 uses the ISensorDriver + DriverRegistry mechanism for registration:

• Enabled at compile time via FASTBEE_ENABLE_I2C_SENSORS macro
• Driver automatically registers to the global registry
• The driver field in configuration is used to match the specific driver implementation

Peripheral Execution Integration

Web Interface Configuration Steps

Create Pressure Display Rule

1. Click Peripheral Execution in the left menu
2. Click the Add Rule button
3. Configure timer trigger:
   • Trigger Type: Timer Trigger
   • Execution Interval: 10 seconds
4. Add actions:
   • Action 1: Read sensor data
     • Action Type: Sensor Read
     • Target Peripheral: bmp280_1
   • Action 2: Display on OLED
     • Action Type: OLED Display
     • Target Peripheral: oled1
     • Action Value:

     #Weather Station
     P:${bmp280_1.pressure}Pa
     Alt:${bmp280_1.altitude}m

5. Click Save

💡 Tip: Use ${peripheralID.fieldName} to reference sensor data

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JSON Configuration Example

Temperature Threshold Alarm

{
  "name": "High Temperature Alarm",
  "enabled": true,
  "triggers": [
    {
      "triggerType": 5,
      "triggerPeriphId": "bmp280_1",
      "intervalSec": 30,
      "operatorType": 2,
      "compareValue": "35"
    }
  ],
  "actions": [
    { "actionType": 0, "targetPeriphId": "buzzer1" }
  ]
}

operatorType: 2 means “greater than”; this rule activates the buzzer above 35°C.

Pressure Display on OLED

{
  "name": "Display Pressure",
  "enabled": true,
  "triggers": [
    { "triggerType": 1, "timerMode": 0, "intervalSec": 5 }
  ],
  "actions": [
    { "actionType": 19, "targetPeriphId": "bmp280_1" },
    { "actionType": 27, "targetPeriphId": "oled1", "actionValue": "P:${bmp280_1.pressure}Pa\nAlt:${bmp280_1.altitude}m" }
  ]
}

Notes

1. Firmware State: Confirm i2cSensors is compiled and active
2. I2C Address Conflict: Cannot have two devices with the same address on the same I2C bus; multiple BMP280s need different SDO levels
3. Altitude Accuracy: Altitude is an estimate based on standard atmospheric pressure (101325 Pa); actual use requires calibrating reference pressure
4. Sampling Frequency: BMP280 internal conversion takes time; interval recommend ≥ 2000ms
5. Wiring Length: I2C cable should not be too long (recommend < 50cm); reduce clock frequency or add repeater for longer runs