AMBIENT LIGHT SENSOR

General Description:

This CJMCU-TEMT6000 Ambient Light Sensor module uses a special ambient light detector (TMET6000) with a spectral response that closely emulates the human eye. It helps you to detect the light density and reflect the analog voltage signal to the Arduino controller. This sensor is a silicon NPN epitaxial planar phototransistor in a miniature transparent 1206 package for surface mounting. It is sensitive to visible light much like the human eye and has a peak sensitivity at 570 nm. While this device is very sensitive to ambient light, but inhibits the infrared (IR) spectrum, which can provide similar “to the human eye,” the visible spectrum greater responsiveness.

Working Principle:

Being a phototransistor, this sensor acts just like any other NPN transistor -- the greater the incoming light on the Base, the more current that can flow from the Collector to the Emitter. Only light that falls within the visible spectrum (390-700 nm) will alter the Base. Infrared, ultraviolet, or any other light we can't directly see will not affect the sensor.

To make taking light measurements as easy as possible, this sensor has been designed into a voltage divider circuit. The TEMT600 acts as one of the resistors in the divider, and, as the light hitting it changes, so too does the voltage on the SIG pin. To read that voltage, simply connect the SIG pin on the TEMT6000 to any analog-to-digital pin on your microcontroller.

Specifications:

  1. AEC-Q101 qualified.
  2. High photosensitivity.
  3. The maximum current is 20 mA.
  4. The power supply mode is within the range of 3.3 to 5 volts.
  5. Collector-emitter voltage is 1.5 volts.
  6. The wavelength is 570 nm.
  7. Detection angle is 60 degrees.
  8. Near-Human Eye Spectral Response.
  9. Scalable Output Voltage.
  10. Adapted to human eye responsively.
  11. Lead (Pb)-free reflow soldering.
  12. Compliant to RoHS Directive 2002/95/EC and in accordance to WEEE 2002/96/EC.

Requirements

S. No. Component Name Values
1 Resistors 10k
2 TEMT6000 (Ambient sensor)

Pin configuration:

S. No. Pins Pin Description
1 S Connect to the Analog output pin
2 G Connect to ground
3 V Connect to 3.3 - 5V

Applications:

  1. Automotive sensors.
  2. Mobile phones.
  3. Notebook computers.
  4. PDA's.
  5. Cameras.
  6. Dashboards.