Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Yellow
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. LED matrices like these are 'multiplexed' - so to control all the seven-segment LEDs you need 14 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space.
The backpacks use a driver chip that does all the heavy lifting for you: They have a built in clock so they multiplex the display. They use constant-current drivers for ultra-bright, consistent color (the images above are photographed at the dimmest setting to avoid overloading our camera!), 1/16 step display dimming, all via a simple I2C interface. The backpacks come with address-selection jumpers so you can connect up to eight 7-segments (or a combination, such as four mini 8x8's and four 7-segments, etc) on a single I2C bus.
Since this display has two LEDs per segment in series we need to power from 5V, even when using 3V logic. However, the chip really prefers the IO signals to be close to the power voltage. If you're using a board with higher-than-5V power, like Raspberry Pi's that tend to be powered by 5.25~5.5V, you may want to add a diode between the power supply output and the power input, to reduce it down.
Quick Spec
- Operating Voltage: 5V
- Colour: Yellow
- Interface: I2C
- This board/chip uses I2C 7-bit addresses between 0x70-0x77, selectable with jumpers
- Dimensions: 50 x 120 x 13mm
- Net Weight: 83g
Resources
Shipping List
- 1 x Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Yellow
Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Yellow
- Brand: Adafruit
- Product Code: AF1269
- Weight: 0.083kg
- Product Status : Active
Stock
| Warehouse | Stock Status | Location |
|---|---|---|
| Centurion | Limited Stock | FD140 |
| Stellenbosch | Limited Stock | 603 |
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R393.00 (Inc Tax: R451.95)
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Tags: i2c, alphanumeric, display, i2c, segment, 7 segment, quad, yellow, 1.2"