Adafruit ALS-PT19 Analog Light Sensor Breakout
ALS-PT19 RoHS-compliant ambient light sensor breakout with high IR rejection and a spectral response close to human vision; outputs an analogue voltage proportional to illuminance. Good drop-in upgrade from a CdS photocell.
Pinout
- GND
Ground connection. Adafruit product page says to connect the - pad to ground.
Type ยท Ground - VCC
Positive supply connection. Adafruit product page says to connect + to power.
Type ยท PowerVoltage ยท 2.5V to 5.5V or so, per Adafruit product page. - OUT
Analogue output. Adafruit product page says to measure the analog voltage on the OUT pin and that voltage increases with more detected light.
Type ยท SignalVoltage ยท Analogue voltage output increases with detected light, per Adafruit product page.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| GND | Ground | Ground connection. Adafruit product page says to connect the - pad to ground. | |
| VCC | Power | Positive supply connection. Adafruit product page says to connect + to power. | 2.5V to 5.5V or so, per Adafruit product page. |
| OUT | Signal | Analogue output. Adafruit product page says to measure the analog voltage on the OUT pin and that voltage increases with more detected light. | Analogue voltage output increases with detected light, per Adafruit product page. |
Pin details
3 connections- GND
Ground connection. Adafruit product page says to connect the - pad to ground.
Ground - VCC
Positive supply connection. Adafruit product page says to connect + to power.
PowerVoltage ยท 2.5V to 5.5V or so, per Adafruit product page. - OUT
Analogue output. Adafruit product page says to measure the analog voltage on the OUT pin and that voltage increases with more detected light.
SignalVoltage ยท Analogue voltage output increases with detected light, per Adafruit product page.
Start wiring
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Adafruit describes the CdS photoresistor as a light sensor whose resistance falls as light increases, and its product page gives an exampโฆ
Module pins: VCC, GND, OUT. Schematik maps them to your board in the app.
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