SSD Key chain
Here's how to make a personalized key-chain using Seven Segment Display. Use it to highlight your Initial or simply use it as a fancy key-chain. It lights up brightly and can be used to search the keyhole in the dark.
Difficulty level : Easy
Things you will need :
1. Seven Segment Display (SSD) Common cathode (CA)
2. 3 volt button cell
3. General purpose PCB
4. 3 volt button cell holder
5. Key-chain
6. Some wire
Pin Diagram :
Circuit Diagram (For displaying 'S') :
#Steps:
Step 1. Take a general purpose PCB.
Step 2. Cut it appropriately such that the Seven Segment Display(SSD) fits on it.
Step 3. Solder the seven segment display on the general purpose PCB. Care should be taken that the open pins should not get shorted while soldering.
Step 4. Make connections for displaying the alphabet of your choice as given in the pin diagram.
Step 5. Take a 3V battery holder and solder it directly on the PCB with proper polarity.
Step 6.Connect a battery in the holder and check if the the SSD displays the required alphabet.
Step 7. Make a small loop using a wire and solder it on the top to make a holder for the chain.
Step 8. Attach a key-chain and you are almost done! You can color the key-chain as per your choice. Make different alphabets using the chart provided above.
Note:
-Only the alphabets A, B, C, E, F, H, I, J, L, O, P, S, U, Y and Z can be made using a Seven Segment Display. Other alphabets cannot be displayed.-Refer the pin diagram of Seven Segment Display to display various alphabets mentioned above.
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