Arduino 7 segment countdown timer

Step 3 The build

This project is quite complicated so you will need basic electronic skills.

First you will have to solder wires on the back to make the multiplexing circuit.
This can be done on a breadboard if your display is not SMD.

Secondy, solder on jumper wires to plug the display into the breadboard.

Thirdly, connect wires from the breadboard to the Arduino in this sequence:

Segment A: pin 7
Segment B: pin 8
Segment C: pin 4
Segment D: pin 3
Segment E: pin 2
Segment F: pin 6
Segment G: pin 5
Gnd1 via resistor: pin 11
Gnd2 via resistor: pin 9

Comments

[FalconFour]

You've got to add more detail to this. I'm having to make a lot of wiring guesswork here. "via resistor"? What value? I assume we're plugging these into digital pins, since there is no such thing as just Arduino "pin 6", etc...? Ground doesn't need a transistor? *shrug*...

[FalconFour]

Also, nowhere in here states what segment is A-B-C-D-E-F-G... biggest bit of guesswork yet :(

[granitepenguin]

Most displays start with A on the top and then go clockwise, with G in the middle, so:

A - top
B - top right
C - bottom right
D - bottom
E - bottom left
F - top left
G - middle

You will probably need to look at the datasheet for whatever 7-segment component you have to tell what pins correspond to what segment, though.

[M4industries]

I will rate this higher if you do one thing, EXPAND ON THIS!