August 31, 2012 AT 1:00 am

LED Clock using Raspberry Pi #piday #raspberrypi @Raspberry_Pi

Adafruit 380

Cobbler Web

Dr. Monk’s DIY Electronics Blog: LED Clock using Raspberry Pi. Simon writes –

Okay, so if you were going to make a simple LED 4 digit clock, you probably wouldn’t start with a Raspberry Pi. But I wanted to test out I2C on the Pi and Adafruit’s I2C LED displays looked like a good bet. I also used a level converter to convert the Pi’s 3.3V I2C to the 5V I2C required by the LED module.

Features!

* Adafruit Cobbler
* Adafruit 4-digit 7 segment display and Backpack
* Adafruit Level Converter


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2 Comments

  1. I noticed that Adafruit’s tutorial on connecting the 7-segment display w/ backpack to a Raspberry Pi doesn’t use a level converter. Is there an advantage to using one?

  2. hiya! you don’t need it connecting the 7-segment display power to 3.3V and if you only have one item on the bus, you can even connect it this way powered off of 5V (the onboard pullups are much weaker than the Pi’s i2c pullups

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