Reference
Last revision 2025/12/26
The article provides an in-depth look at the VEML7700 sensor, detailing its communication protocol and light intensity principles, along with practical examples and supplementary resources to enhance understanding and application.
Library
Communication Protocol Description
The sensor supports an easy to use Gravity I2C interface.
Principle
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.
Other Supplementary Information
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