# How Cold Is It?

## Overview

![](https://cdn-learn.adafruit.com/assets/assets/000/036/959/medium800/temperature_banner.jpg?1478015461)

This is a fun and simple beginner project that turns the Circuit Playground into a cold temperature indicator. It uses the on board temperature sensor to read the current temperature. The coldest temperature measured is indicated on the NeoPixels.

An additional sketch is provided which turns the Circuit Playground into a temperature data logger.

# Required Parts

This project uses the sensors already included on the Circuit Playground so no additional electronics or soldering are required. You will also need some batteries and a holder for the batteries.

- [Circuit Playground](https://www.adafruit.com/products/3000)
- [3 x AAA Battery Holder](https://www.adafruit.com/products/727)
- 3 x AAA Batteries (NiMH work great!)

![circuit_playground_items.jpg](https://cdn-learn.adafruit.com/assets/assets/000/036/733/medium640/circuit_playground_items.jpg?1477091448)

# Before Starting

If you are new to the Circuit Playground, you may want to first read these overview guides.

- [Overview](../../../introducing-circuit-playground)
- [Lesson #0](../../../circuit-playground-lesson-number-0)

This project will use the Arduino IDE. Make sure you have added the board support for the Circuit Playground as well as installed the Circuit Playground library. **MUST DO BOTH.** This is covered in the guides linked above.

- [Next Page](https://learn.adafruit.com/how-cold-is-it/hello-temperature.md)

## Featured Products

### Circuit Playground Classic

[Circuit Playground Classic](https://www.adafruit.com/product/3000)
Would you like to learn electronics, with an all-in-one board that has sensors and LEDs built in? **Circuit Playground** is here - and it's the best way to practice programming on real hardware with no soldering or sewing required!

This is the **Classic**...

In Stock
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[Related Guides to the Product](https://learn.adafruit.com/products/3000/guides)
### 3 x AAA Battery Holder with On/Off Switch and 2-Pin JST

[3 x AAA Battery Holder with On/Off Switch and 2-Pin JST](https://www.adafruit.com/product/727)
This battery holder connects 3 AAA batteries together in series for powering all kinds of projects. We spec'd these out because the box is slim, and 3 AAA's add up to about 3.3-4.5V, a very similar range to Lithium Ion/polymer (Li-Ion) batteries and have an on-off switch. That makes...

In Stock
[Buy Now](https://www.adafruit.com/product/727)
[Related Guides to the Product](https://learn.adafruit.com/products/727/guides)

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