Step 1: INTRODUCTION AND MATERIALS
The difficulty of this build is not much but you will require lots of patience as the steps needed to be followed correctly in order to get the results. It took me about 15 to 20 hours to build this but I distributed the time around 2 weeks. I advice you also to do the same.
The materials you would be requiring for this build are -
• IC4026 x3
• Common cathode seven segment display x3
• 555 IC x1
• Purf Board/ proto board
• 9v battery snap x1
• 8pin IC socket x1
• 16pin IC socket x3
• Ribbon cable 8 core x2m(optional but makes it very easy)
• ~10 k resistor x1
•~ 1 k resistor x1
• 1uf capacitor x1
• 10k to 50k resistor to set the speed
• 100k resistor x1
• Buttons x2
•470 ohm resistor
The tools you would require
• Soldering iron
• Wire strippers
• Hot glue
• 22 gauge single core wire
Step 2: GETTING THE SEVEN SEGMENT SEGMENT READY
You can do this by grounding the center terminal through a 470 ohm resistor an connecting the positive end to one of the terminals each one by one. Also make a note of the segments a to g as you will require them later.
Step 3: CONNECTING THE SEVEN SEGMENT DISPLAY
Also check after connecting each display whether each segment is working as it should by connecting the ground and touching each segment wire to the positive terminal.
ALSO GROUND THE DISPLAY THROUGH A 470 OHM RESISTOR
Step 4: SETTING UP THE PULSING 555
Step 5: CONNECTING THE DISPLAYS TO THE 4026
In the pin out diagram the pins marked A,B,C,D,E,F,G have to be connected to the corresponding segments in the display. Also check by touching pins of the 4026.
Step 6: COMPLETING THE CIRCUIT
After connecting each 4026 test by giving pulse.
Step 7: TROUBLESHOOTING
The trick for the completion of the project is to check after each step.
Step 8: TESTING
The number stop game or the reaction timer: