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GA1A12S202 Log-scale Analog Light Sensor
$5.95
Certifications:



Additional Information:
Manufacturer:
Adafruit Industries
Manufactured In: United States
Mfg Part Number: 1384
BC Robotics SKU: SEN-089
Stock Status: In Stock
Ships From: Canada
Manufactured In: United States
Mfg Part Number: 1384
BC Robotics SKU: SEN-089
Stock Status: In Stock
Ships From: Canada
Recommended Skills:
Soldering Skill:
Beginner
Prototyping Skill: Beginner
Programming Skill: N/A
Prototyping Skill: Beginner
Programming Skill: N/A
Warranty & Returns
Warranty Policy:
30 Day Warranty
Return Policy: 14 Day Unopened / Unused
Return Policy: 14 Day Unopened / Unused
For more information on our Warranty & Return Policy please consult our Terms of Service.
GA1A12S202 Log-scale Analog Light Sensor
$5.95
SKU: SEN-089 - Mfg Part Number: 1384
Description
Upgrade a project that uses a photocell with the GA1A12S202 analog light sensor. Like a CdS photo-cell, the sensor does not require a microcontroller, the analog voltage output increases with the amount of light shining on the sensor face. This sensor has a lot of improvements that make it better for nearly any project.
The biggest improvement over plain photocells is a true log-lin relationship with light levels. Most light sensors have a linear relationship with light levels, which means that they're not very sensitive to changes in darkened areas and 'max' out very easily when there's a lot of light. Sometimes you can tweak a resistor to make them better in dark or bright light but its hard to get good performance at both ends. This sensor is logarithmic over a large dynamic range of 3 to 55,000 Lux, so it has a lot of sensitivity at low light levels but is also nearly impossible to “max out” so you can use it indoors or outdoors without changing code or calibration. Since the sensor is fabricated on a chip, there are also fewer manufacturing variations, so you won't have to calibrate the sensor from one board to another.
Using the sensor is easy as pie: connect the Vin to 2.3-6VDC, Gnd to ground and measure the analog output on OUT. It will range up to 3V (at extremely bright outdoor sunlight). On an Arduino, just use analogRead() with the OUT pin connected to an analog pin. For more information including graphs, power consumption, etc check out the datasheet in the Tech Details tab. On this breakout we placed a 68KΩ resistor from OUT to ground to turn the current into a voltage.
Features
- Sensitive from 3 to 55,000 Lux
- 2.3-6VDC
- Nearly impossible to “max out”
- big improvement over plain photocells
Resources
Tutorials:
GA1A12S202: https://learn.adafruit.com/adafruit-ga1a12s202-log-scale-analog-light-sensor
Only 2 left in stock (can be backordered)
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Additional information
Weight | 2 g |
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