Tinker Tailor
ALS-PT19 Analog Light Sensor Breakout
ALS-PT19 Analog Light Sensor Breakout
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The easiest way to make a project react to light. The ALS-PT19 is a tiny phototransistor that responds to light much like the human eye does, so it reacts to the brightness you actually see and ignores most infrared.
Ships next business day from Nova Scotia · 30-day returns · Questions? cmoz@tinkertailor.ca
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Details
There are just three pins: power, ground and output. The output is an analog voltage that gets higher as the room gets brighter. No library needed — just read it with analogRead(). That makes it a perfect first sensor for students and workshops.
Specifications
- Sensor: ALS-PT19 phototransistor
- Spectral response: close to the human eye
- Output: analog voltage (higher = brighter)
- Supply voltage: 2.5–5.5V
- Headers: included, not soldered
Pin Definitions
- + — Power in, 2.5–5.5V
- − — Ground
- OUT — Analog output — connect to an ADC pin
Project Ideas
Night-time safety wear that lights up when it gets dark, a jacket that glows brighter in dim rooms, stage costumes that react to spotlights, or a light-meter lesson for your class.
Good to know
On the ESP32, use an ADC1 pin: ADC2 pins stop working when Wi-Fi is on.
Pair It With
Great with beginner-friendly boards like the Adafruit Gemma M0, Adafruit Flora V3 or Beetle ESP32 [Sewable]. Use our soft silicone wire sampler for soft, flexible connections inside a garment.
In the box
- ALS-PT19 light sensor board × 1
- Header pins × 1 set
