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The BME82M131 is an ambient light sensing module developed using the VEML7700 sensor. It is commonly used in lighting devices to automatically adjust the brightness based on ambient light intensity to achieve power savings.
| Select | Quantity | Discount | Unit price |
| 1-9 | - | US$3.90 | |
| 10+ | 5% | US$3.71 |
How the BME82M131 measures ambient light intensity?
The built-in Ambient Light Sensor (ALS) VEML7700 senses ambient light intensity by measuring the resistance of the Light-Dependent Resistor (LDR) and converting it into a digital signal. You can configure high and low thresholds of ambient light for your application. For example, when applying the product in an indoor lighting device, if the ambient light exceeds the high threshold during the daytime, the product automatically enters power-saving mode. Conversely, when the ambient light falls below the low threshold at nighttime, it increases the light intensity.
Power-saving mode
The BME82M131 offers power-saving mode function that can be configured as either enabled or disabled. There are four modes, ranging from 1 to 4. Mode 4 provides the highest power savings. You can configure the power-saving mode using the 'setPowerSavingMode' function available in the Arduino library.
Cascading
In the rear side of the BME82M131 are cascading interfaces (SCOM_O and SCOM_I). You can cascade up to 8 BME82M131 modules simultaneously, and only connect one of them to the development board. The BME82M131 modules communicate with the development board through I2C interface.
To use with a development board
There is a BMCOM on the product to directly connect to BMduino development boards, such as BM53A367A. You can use it with other development boards, such as Arduino UNO, as well.
| Pin | Pin name | Function |
|---|---|---|
| 1 | INT | Interrupt pin
When ambient light exceed or fall below thresholds, outputs low Otherwise, outputs high |
| 2 | SCL | I2C: clock line |
| 3 | SDA | I2C: data line |
| 4 | VDD | Power supply: 3.3V~5.5V |
| 5 | GND | Ground |
| 6 | GND | Ground |
| 7 | VDD | Positive power (3.3V~5.5V) |
| 8 | ST_O | Cascade status output |
| 9 | TRX | Cascade single-bus communication pin |
| 10 | VDD | Positive power (3.3V~5.5V) |
| 11 | GND | Ground |
| 12 | ST_I | Cascade status input |
| 13 | TRX | Cascade single-bus communication pin |
| Function | BME82M131 | BMS33M332 |
|---|---|---|
| Input voltage | 3.3V~5.5V | 3.3V~5.5V |
| Sensor | VEML7700 | STK3337-X |
| ALS measurement range
(Max.) |
0~120klx | 0~53764lx |
| Resolution | 16-bit | 16-bit |
| Proximity | X | O |
| Cascadable | O
Up to 8 modules |
X |
| Power saving | O
4 modes configurable |
X |
| HS Code (reference) | 8504.50.90.00-5 |
|---|
