# Large Pi-based Thermometer and Clock ## Overview This project combines a whole heap of modules to enable a Raspberry Pi to power a large 1.2 inch 4 digit 7 segment display. A small switch switches the display between showing the temperature and the current time. The project uses a real-time clock (RTC) to ensure that the Pi always has the correct time, even if it is not connected to the Internet. ![](https://cdn-learn.adafruit.com/assets/assets/000/006/396/medium800/raspberry_pi_overview.jpg?1396835749) - [Next Page](https://learn.adafruit.com/large-pi-based-thermometer-and-clock/hardware.md) ## Featured Products ### Raspberry Pi 3 - Model B+ - 1.4GHz Cortex-A53 with 1GB RAM [Raspberry Pi 3 - Model B+ - 1.4GHz Cortex-A53 with 1GB RAM](https://www.adafruit.com/product/3775) The Raspberry Pi 3 Model B is the most popular Raspberry Pi computer made, and the Pi Foundation knows you can always make a good thing _better_! And what could make the Pi 3 better? How about a _faster_ processor, 5 GHz WiFi, and updated Ethernet chip with PoE capability?... In Stock [Buy Now](https://www.adafruit.com/product/3775) [Related Guides to the Product](https://learn.adafruit.com/products/3775/guides) ### Adafruit DS1307 Real Time Clock Assembled Breakout Board [Adafruit DS1307 Real Time Clock Assembled Breakout Board](https://www.adafruit.com/product/3296) This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The **DS1307** is the most... In Stock [Buy Now](https://www.adafruit.com/product/3296) [Related Guides to the Product](https://learn.adafruit.com/products/3296/guides) ### Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Red [Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Red](https://www.adafruit.com/product/1270) What's better than a single LED? Lots of LEDs! A fun way to make a numeric display is to use a [4-digit 7-segment display](https://www.adafruit.com/category/37_103). LED matrices like these are 'multiplexed' - so to control all the seven-segment LEDs you need 14 pins.... Out of Stock [Buy Now](https://www.adafruit.com/product/1270) [Related Guides to the Product](https://learn.adafruit.com/products/1270/guides) ### Assembled Pi T-Cobbler Plus - GPIO Breakout [Assembled Pi T-Cobbler Plus - GPIO Breakout](https://www.adafruit.com/product/2028) **This is the assembled version of the Pi T-Cobbler Plus.  It only works with the Raspberry Pi Model Zero, A+, B+, Pi 2, Pi 3, Pi 4, and Pi 5!** (Any Pi with 2x20 connector) The Raspberry Pi has landed on the Maker World like a 40-GPIO pinned, quad-USB ported,... Out of Stock [Buy Now](https://www.adafruit.com/product/2028) [Related Guides to the Product](https://learn.adafruit.com/products/2028/guides) ### DS18B20 Digital temperature sensor + extras [DS18B20 Digital temperature sensor + extras](https://www.adafruit.com/product/374) These 1-wire digital temperature sensors are fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter. They work great with any microcontroller using a single digital pin, and you can even connect multiple... In Stock [Buy Now](https://www.adafruit.com/product/374) [Related Guides to the Product](https://learn.adafruit.com/products/374/guides) ### Half Sized Premium Breadboard - 400 Tie Points [Half Sized Premium Breadboard - 400 Tie Points](https://www.adafruit.com/product/64) This is a cute, half-size breadboard with 400 tie points, good for small projects. It's 3.25" x 2.2" / 8.3cm x 5.5cm with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the breadboard as... In Stock [Buy Now](https://www.adafruit.com/product/64) [Related Guides to the Product](https://learn.adafruit.com/products/64/guides) ### Breadboard-friendly SPDT Slide Switch [Breadboard-friendly SPDT Slide Switch](https://www.adafruit.com/product/805) These nice switches are perfect for use with breadboard and perfboard projects. They have 0.1" spacing and snap in nicely into a solderless breadboard. They're easy to switch no matter what size fingers you have, but not so easy that they'll get flipped by accident. Work great as... In Stock [Buy Now](https://www.adafruit.com/product/805) [Related Guides to the Product](https://learn.adafruit.com/products/805/guides) ### Premium Male/Male Jumper Wires - 40 x 6" (150mm) [Premium Male/Male Jumper Wires - 40 x 6" (150mm)](https://www.adafruit.com/product/758) Handy for making wire harnesses or jumpering between headers on PCB's. These premium jumper wires are 6" (150mm) long and come in a 'strip' of 40 (4 pieces of each of ten rainbow colors). They have 0.1" male header contacts on either end and fit cleanly next to each other... Out of Stock [Buy Now](https://www.adafruit.com/product/758) [Related Guides to the Product](https://learn.adafruit.com/products/758/guides) ## Related Guides - [Adafruit LED Backpacks](https://learn.adafruit.com/adafruit-led-backpack.md) - [DS1307 Real Time Clock Breakout Board Kit](https://learn.adafruit.com/ds1307-real-time-clock-breakout-board-kit.md) - [Adding a Real Time Clock to Raspberry Pi](https://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi.md) - [Personalized NextBus ESP8266 Transit Clock](https://learn.adafruit.com/personalized-esp8266-transit-clock.md) - [CircuitPython Libraries on Linux and ODROID C2](https://learn.adafruit.com/circuitpython-libaries-linux-odroid-c2.md) - [Adding Basic Audio Ouput to Raspberry Pi Zero](https://learn.adafruit.com/adding-basic-audio-ouput-to-raspberry-pi-zero.md) - [Adafruit's Raspberry Pi Lesson 12. Sensing Movement](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-12-sensing-movement.md) - [Adafruit's Raspberry Pi Lesson 11. DS18B20 Temperature Sensing](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing.md) - [Adafruit AMG8833 8x8 Thermal Camera Sensor](https://learn.adafruit.com/adafruit-amg8833-8x8-thermal-camera-sensor.md) - [NeoPixel 60 Ring Wall Clock](https://learn.adafruit.com/neopixel-60-ring-clock.md) - [Adafruit's Raspberry Pi Lesson 13. Power Control](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-13-power-control.md) - [Adafruit's Raspberry Pi Lesson 4. GPIO Setup](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup.md) - [Windows IoT Core Application Development: Headless Blinky](https://learn.adafruit.com/windows-iot-application-development-headless-application.md) - [Digital Clock with CircuitPython](https://learn.adafruit.com/digital-clock-with-circuitpython.md) - [Playing sounds and using buttons with Raspberry Pi](https://learn.adafruit.com/playing-sounds-and-using-buttons-with-raspberry-pi.md) - [LoRa and LoRaWAN Radio for Raspberry Pi](https://learn.adafruit.com/lora-and-lorawan-radio-for-raspberry-pi.md)