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Introduction
VEML7700 is a high accuracy ambient light digital 16-bit resolution sensor. It includes a high sensitive photo diode, a low noise amplifier, a 16-bit A/D converter and supports an easy to use Gravity I2C interface. It outputs a digital signal directly and no need for complicated calculations. This is a more acurate and easier to use version of the simple foto resistor which only outputs a voltage that needs to be calculated in order to obtain meaningful data. The data which is output by this sensor is directly output in Lux (Lx). When objects which are lighted in homogeneous get the 1 lx luminous flux in one square meter ,their light intensity is 1lx. Sometimes to take good advantage of the illuminant, you can add a reflector to the illuminant. So that there will be more luminous flux in some directions and it can increase the ilumination of the target surface.
For example:
- Night: 0.001--0.02;
- Moonlightnight:0.02--0.3;
- Cloudy indoor:5--50;
- Cloudy outdoor:50--500;
- Sunny indoor:100--1000;
- Under the sunlight in summer afternoon: about 10*6 power;
- Reading books for intensity of illumination:50--60;
- Home video standard intensity of illumination:1400.
Specification
- Supply Voltage: 3.3-5V
- Working Current: 45uA
- Shutdown Mode: 0.5uA
- Measuring Range: 0-120klx
- Accuracy: 0.0036 lx / ct
- Working Temperature: -25 ℃ ~ +85 ℃
- Dimension: 30 × 22 (mm) /1.81 x0.866 (inches)
- Weight: 12g
Board Overview
Num | Label | Description |
---|---|---|
1 | SDA | IIC-Data |
2 | SCL | IIC-Clock |
3 | GND | GND |
4 | VCC | VCC |
Tutorial
Requirements
Hardware
- DFRduino UNO (or similar) x 1
- Gravity: I2C VEML7700 Ambient Light Sensor x1
- M-M/F-M/F-F Jumper wires
Software
- Arduino IDE, Click to Download Arduino IDE from Arduino®
Connection Diagram
Ct-shield V2.0 Download
Sample Code
Ct Shield
Download VEML7700 Arduino LibraryHow to install Libraries in Arduino IDE
Expected Results
FAQ
For any questions, advice or cool ideas to share, please visit the DFRobot Forum. |
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More Documents
Get Gravity: I2C VEML7700 Ambient Light Sensor (0~120Klx) from DFRobot Store or DFRobot Distributor.