These Adafruit Red 4-Digit 7-Segment Displays take the pain out of using 7-segment displays by including an I2C backpack to do the constant current driving and multiplexing. Connecting displays like this can be quite expensive in precious GPIO pins, but with the added backpack they only use the 2 x I2C signals plus 2 x power connections. They are great for microcontrollers with limited outputs such as the Adafruit Trinkets which only have 5 x IO pins. They're also handy for grown up boards like the Raspberry Pi which have better things to do with their time than multiplex LEDs. Applications such as a voltmeter (please be careful), temperature gauge or clock suddenly become much simpler.
Each board has address selection jumpers allowing you to have 8 x of these displays attached to a single I2C bus. There are I2C commands to write to all four digits, just one digit, adjust the brightness, etc. As you would expect Adafruit have also published a free library and a tutorial to get you off to a quick start. Supplied with a 4-way strip of header pins for you to solder on as required for your project.
- Add a 4-digit 7-segment display to your project using only 2 x I2C lines
- Built-in constant current drivers and multiplexers
- 15 levels of brightness control for the ultra-bright LED segments
- Suitable for 3.3 and 5V power supplies
- Backpack dimensions: 27 x 50 x 4mm (1.1 x 2 x 0.16in.)
- 7-Segment display dimensions: 19 x 50 x 14mm (0.75 x 2 x 0.56in.)
- Adafruit part no.: 878
Please note that some soldering is required to mount the display on the backpack board, a total of 14-pins. You may also want to solder on the supplied 4-pin header or wire directly to the board.
Alternatively, we supply Adafruit 8x8 matrix displays which also have I2C backpacks, great for jewellery, animated displays etc..
*Customers looking to resell on eBay or Amazon should contact Adafruit directly.
*Customers looking to resell on eBay or Amazon should contact Adafruit directly.
