For a long time we've had small 7-segment displays and *huge *7-segment displays, but now we finally have something in between. These 20mm 4-digit 7-segment displays are big enough to see from a distance but not so big that you'd have trouble finding an enclosure for them.
These common-cathode displays feature 4 x 7-segment digits and one decimal point per digit. The LEDs have a forward voltage of 1.9VDC and a max forward current of 20mA.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Based on 3 ratings:
4 of 4 found this helpful:
Fits perfectly on my breadboard. Buying this was great for learning one of the few ways led segment displays work to build on basic knowledge. Pin numbers are labeled for the schematic on the datasheet and pins 1 &12 are printed next to their pins underneath making it easy to figure out. Negative lead goes to digit selector and positive goes to letter(individual segment) that means only a single led segment is on at once. With the use of a microcontroller or equivalent you can rapidly change between which led segment is on. Because the rapid change happens faster than the eye can tell; it looks as if multiple leds are on. If you hook multiple letters/ digits up all at the same time you will be increasing current across a common node so keep in mind ohms law and the datasheet limits so you don't damage anything.
3 of 3 found this helpful:
This relatively inexpensive display works well after you know how it works. To that end, I published a basic hookup guide on hackster.io:
The only problem I have with the product is some sort of lack of documentation on it. The only data sheet available is in chinese and the pintout isn't even listed on it. I mapped it for whoever else wants to use this. Here it is:
Pin-out (looking at the digits as if it was installed on a breadboard, with the decimal points at the bottom):
12 11 10 9 8 7
1 2 3 4 5 6
Max 3V, don't forget your resistor!