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![Adafruit Photo cell (CdS photoresistor) [ADA161]](https://m.media-amazon.com/images/I/51JfafhXsdL.jpg)
Adafruit Photo cell (CdS photoresistor) [ADA161]
✅ In stock
F
Grade
Analysis Confidence
100%
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Sep 21, 2026 3:32 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- 💰At 48% above its usual rate, this is currently priced higher than what most shoppers have paid.
- 🏷️The retail sticker price has been slashed by 79% — a steep markdown from the official listing.
- 📉No lower price has surfaced in the past twelve months, making this one of the standout deals in recent memory.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0/20
Deal Strength
16/20
Momentum
4/10
📝 Product Overview
🏪 Sold by
PiShop US
📦 Fulfillment
Fulfilled by Amazon
🚚 Shipping
Free Shipping
Product Details
✓CdS cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When its light, the resistance is about ~1KΩ, when dark it goes up to ~10KΩ.
✓To use, connect one side of the photo cell (either one, its symmetric) to power (for example 5V) and the other side to your microcontroller's analog input pin. Then connect a 10K pull-down resistor from that analog pin to ground. The voltage on the pin will be 2.5V or higher when its light out and near ground when its dark.
✓Length: 4.46mm/0.18in, Width: 5mm/0.20in, Height: 2.09mm/0.08in, Weight: 0.25g/0.01oz
⚙️ Specifications
Brand
Adafruit
Recommended Uses For Product
Camera
Unit Count
1 Count
Voltage
2.5 volts
Reusability
Single Use
Item model number
ADA161
Item Weight
0.035 ounces
Package Dimensions
2.6 x 1.42 x 0.08 inches
Manufacturer
Adafruit
ASIN
B00XW2MI4E
Is Discontinued By Manufacturer
No