SKU: 17234798136

Adafruit PiRTC - PCF8523 Real Time Clock for Raspberry Pi 3386

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Description

Adafruit PiRTC - PCF8523 Real Time Clock for Raspberry Pi 3386This is a great battery backed real time clock (RTC) that allows your Raspberry Pi project to keep track of time if the power is lost. Perfect for data logging, clock building, time stamping, timers and alarms, etc. Equipped with PCF8523 RTC, it works great with the Raspberry Pi and has native kernel support. Works perfectly with any Raspberry Pi (or similar single board linux computer) including the Pi 1, Pi 2, Pi 3, Pi Zero, A+, B+, Pi 4, etc. Fully


This is a great battery-backed real time clock (RTC) that allows your Raspberry Pi project to keep track of time if the power is lost. Perfect for data-logging, clock-building, time-stamping, timers and alarms, etc. Equipped with PCF8523 RTC, it works great with the Raspberry Pi and has native kernel support.

Works perfectly with any Raspberry Pi (or similar single board linux computer) including the Pi 1, Pi 2, Pi 3, Pi Zero, A+, B+, Pi 4, etc.

  • Fully assembled & tested PCB plugs directly into your Pi's GPIO pins - No soldering required!
  • Will keep time for 5 years or more

Note: This product does not come with a CR1220 coin cell battery. We recommend you purchase a coin cell battery to use with this product.

The PCF8523 is simple and inexpensive but not a high precision device. It may lose or gain a second or two per day. For a high-precision, temperature compensated alternative, please check out the DS3231 precision RTC.

For setting up your Raspberry Pi to use the PiRTC, check out our detailed tutorial!

 

Technical Details

Product Dimensions: 21.0mm x 20.0mm x 12.0mm / 0.8" x 0.8" x 0.5"

Product Weight: 2.2g / 0.1oz

 

[Description provided by Adafruit]

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SKU: 17234798136

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Kristi
Cuba, US
★★★★★ 4
Cute and comfortable
Color: Pattern Leopard, Size: Medium
Comfortable and cute. A little long but still wear them with no issues. The material is light but synthetic so not really breathable. I foresee wearing them often.
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Reviewed in the United States on May 14, 2026
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Love these shirts
Size: Small, Color: Watermelon, Number of Items: 1
Love the fabric. They feel so much better than some of the other shirts I have. They’re thicker and just feel nicer. Love this color too. Got a small and also have another color in medium. Both fit, just depends on how casual I want to look. I’ll be getting more!
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Reviewed in the United States on May 30, 2026
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S. H.
Birmingham, US
★★★★★ 5
Nice Quality for the Price
Size: Large, Color: White, Number of Items: 1
I ordered a large and it was a little too big. I washed and dried it and it didn't shrink too much. It's very soft and feels nice. For the price it's better quality than expected. I am planning to order a medium which should be the right size. The large fits my husband perfectly. F/5'11"/165lbs M/6'/170
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Reviewed in the United States on May 6, 2026
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Sean Bozarth
Los Angeles, US
★★★★★ 5
Soft, Relaxed Fit Tee That Gets Better with Every Wash
Size: Medium, Color: Black, Number of Items: 1
I ordered the Comfort Colors Adult Heavyweight Short Sleeve tee and it honestly lives up to the name. The fabric has that thicker, broken-in feel right out of the package. It is soft without feeling thin or flimsy, and it has that slightly faded, lived-in look that Comfort Colors is known for. The fit is relaxed but not sloppy. It hangs nicely without clinging, and the heavyweight cotton gives it structure. It feels durable and well made, especially around the collar and seams. After washing, it softened even more but didn’t shrink much or lose its shape. What I like most is how versatile it is. It works for casual days, layering, or even as a simple everyday staple. The colors also tend to have that washed, vintage vibe rather than looking overly bright or synthetic. Overall, this is a dependable, comfortable T-shirt that feels like it will last. If you like a slightly heavier cotton with a relaxed fit, this one is a solid choice.
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Draper, US
★★★★★ 4
Good basic t-shirt with one caveat
Size: XX-Large, Color: Crunchberry, Number of Items: 1
This shirt has a good weight to it and feels well made. I bought three of them after reading a review at the New York Times. It is a really good t-shirt for a great price. The only caveat is the sizing. For a unisex shirt the shoulder width is a bit too broad for a woman. The shoulder seam is a good two inches below my shoulder. That's probably to be expected, but if you are a woman and that would bother you I would look for another shirt with women's sizing. Also, the neck is weirdly high and I keep pulling it away a bit. Not deal breakers for me but did cause me to knock off a star. If I could I'd give it four and a half stars.
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Reviewed in the United States on May 13, 2026

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