Design with BH1750 Light Sensor in Cirkit DesignerThe BH1750 is a digital light sensor manufactured by Fermion (Part ID: SEN0097). It is designed to measure ambient light intensity in lux, providing precise and reliable readings. The sensor communicates via the I2C protocol, making it easy to integrate into microcontroller-based systems. Its compact design and low power consumption make it ideal for a wide range of applications.
This circuit uses an Arduino UNO to interface with a BH1750 light sensor via I2C communication. The Arduino reads light intensity data from the BH1750 sensor, which is powered by the Arduino's 3.3V and GND pins.
Open Project in Cirkit Designer
This circuit uses an Arduino Mega 2560 to interface with a BH1750 light sensor. The Arduino provides power to the BH1750 and communicates with it via the I2C protocol using the SCL and SDA pins. The setup is designed to read light intensity data from the BH1750 sensor.
Open Project in Cirkit Designer
This circuit connects an ESP32C3 Supermini microcontroller to a BH1750 light sensor module. The ESP32C3's GPIO20 and GPIO21 pins are used for the I2C communication with the BH1750's SCL and SDA pins, respectively. The microcontroller is programmed to interact with the light sensor, likely to measure ambient light levels.
Open Project in Cirkit Designer
This circuit features an Arduino UNO microcontroller connected to a BH1750 light intensity sensor and a 20x4 LCD display, both interfaced via I2C communication. The Arduino is programmed to read the ambient light level from the BH1750 sensor and display the readings in lux on the LCD. The circuit is designed for monitoring and displaying real-time light intensity data.
Open Project in Cirkit DesignerThe BH1750 offers high sensitivity and accuracy, making it suitable for various lighting conditions, from dim to bright environments.
| Parameter | Value |
|---|---|
| Operating Voltage | 2.4V to 3.6V |
| Typical Operating Voltage | 3.0V |
| Current Consumption | 0.12mA (typical) |
| Measurement Range | 1 lux to 65535 lux |
| Communication Protocol | I2C |
| I2C Address (Default) | 0x23 or 0x5C (configurable) |
| Resolution | 1 lux |
| Operating Temperature | -40°C to +85°C |
| Dimensions | 3.0mm x 1.6mm x 1.2mm |
The BH1750 sensor module typically includes six pins. Below is the pinout description:
| Pin Name | Description |
|---|---|
| VCC | Power supply input (2.4V to 3.6V) |
| GND | Ground |
| SDA | I2C data line |
| SCL | I2C clock line |
| ADDR | I2C address selection (connect to GND or VCC) |
| NC | Not connected (leave unconnected) |
0x23 (default).0x5C.The BH1750 is straightforward to use in a circuit, thanks to its I2C interface. Below are the steps to integrate and use the sensor:
Wiring:
Install Required Library:
Example Code: Use the following code to read light intensity from the BH1750:
#include <Wire.h>
#include <BH1750.h>
BH1750 lightMeter;
void setup() {
Serial.begin(9600); // Initialize serial communication at 9600 baud
Wire.begin(); // Initialize I2C communication
if (lightMeter.begin()) {
Serial.println("BH1750 initialized successfully");
} else {
Serial.println("Error initializing BH1750. Check wiring!");
while (1); // Halt execution if initialization fails
}
}
void loop() {
float lux = lightMeter.readLightLevel(); // Read light intensity in lux
if (lux >= 0) {
Serial.print("Light Intensity: ");
Serial.print(lux);
Serial.println(" lux");
} else {
Serial.println("Error reading light level");
}
delay(1000); // Wait for 1 second before the next reading
}
No Data or Incorrect Readings:
BH1750 Initialization Fails:
Fluctuating Readings:
Sensor Not Detected on I2C Bus:
Q1: Can the BH1750 measure light intensity in direct sunlight?
A1: Yes, the BH1750 can measure up to 65535 lux, but prolonged exposure to direct sunlight may reduce accuracy.
Q2: Can I use the BH1750 with a 5V microcontroller?
A2: Yes, but you must use a logic level shifter to step down the I2C signals to 3.3V to avoid damaging the sensor.
Q3: How do I change the measurement mode of the BH1750?
A3: The BH1750 supports multiple modes (e.g., high resolution, low resolution). Refer to the library documentation to configure the desired mode.
Q4: What is the typical response time of the BH1750?
A4: The response time depends on the measurement mode, typically ranging from 16ms to 120ms.
By following this documentation, you can effectively integrate and use the BH1750 light sensor in your projects.