The Adafruit GA1A1S202 Log-Scale Analogue Light Sensor is very simple sensor to use, just add power and then monitor the analogue output. Most light sensors have a linear response to the light intensity which means that they can be quite insensitive to low light levels and then max-out at high light levels. This sensor on the other hand has a logarithmic response which means that it is more sensitive in low light conditions when small changes in intensity make a big difference to a human eye. It's also less sensitive to changes in very bright conditions when it takes a bigger change to register with the human eye.
The light sensor has a dynamic range of between 3 and 55,000 lux. 3 lux is equivalent to civil twilight. Here's a fun fact, evening twilight ends when the centre of the sun is 6° below the horizon. 55,000 lux is equivalent to full sunlight on a clear day.
Supplied as a fully assembled and tested light sensor board plus a strip of 0.1in. pitch header pins for you to solder on as required. Adafruit provide a free tutorial to help get you started. When you read the datasheet you will see from table 3.3 that the GA1A1S202 provides an output current not a voltage. Adafruit have added a 68kΩ resistor to translate this to a more convenient and microcontroller friendly voltage of 0.3 to 3V.
- Log-linear response means it's more sensitive in low light situations
- Dynamic response 3 to 55,000 lux
- Analogue output 0 to 3V
- 2.3 to 6V DC power supply
- 1 x mounting hole
- Dimensions 10 x 13 x 1.5mm (0.4 x 0.5 x 0.06in.)
- Adafruit part no.: 1384
*Customers looking to resell on eBay or Amazon should contact Adafruit directly.
{{SessionBasket.ItemCount }}
