How to Use Seven Segment

Some of you might think that this is actually not important, because you can try this yourself. But, do you know how many volts do you need to light a LED? Do you know about the current limit that will light a LED without breaking it? Of course you can try this yourself, but some of people are just too lazy to do this. :P

Now, what are the limits? LED is a diode that emits light. The LED in seven segment is just a small LED, so it can’t take too much power from the source. A common LED in seven segment only needs approximately 3 V and a current limit of 20 mA. If you have a 5 V battery or 4.5 V battery, you should insert a resistor in the circuit to prevent a current overflow. Usually, the resistor is about 330 Ohm. The LED should be bright enough to be noticed.

How can you light the LEDs? You just need to set a battery and a 220 Ohm resistor with the LED. The positive side of the battery should meet the anode of the seven segment and the negative side of the battery should meet the cathode of the seven segment. If you are using common-cathode seven segments, there are 8 pins of anode that can be paralleled to light every segment of the seven segment. We will give you a simple circuit below.