Up Counter
NEW PROJECT: EASY STEPS MAKE INFRARED BASED OBJECT COUNTER
An up counter simply counts from 0 to 9. We can use this circuit to make digital object counter. This circuit can also be used to make a digital clock.
Click here to read about ‘How digital Clock works?’
We need following components for making an up counter.
- 555- configured in astable mode
- 7490- decade counter- Click here to get the datasheet
- 7447- BCD to seven segment display- Click here to get the datasheet.
- Seven segment display- Common Anode
Here, CC-Common Cathode and CA-Common Anode.
6. Resistors- see the schematic
7. Capacitor- see the schematic
8. LED
9. Power supply
The 555-astable multivibrator gives pulse to 7490, for each pulse it outputs 4 bits which are interpreted by 7447 and displayed as numbers on seven segment display.
Click here to read how 7490 IC outputs 4 bits.
Counter with different numbers:
You don’t need to make changes on 555 astable timer and 7447. You just need to modify connections on pins 2,3,6 and7 of 7940.
Count 0 to 1
– Short pins 2 and 9 i.e. connect pin 2 to 9.
– Remove connection of pin 3.
– Connect pins 6 and 7 to negative terminal of battery or ground.
Count 0 to 2
– Short pins 2 and 9 i.e. connect pin 2 to 9.
– Connect pin 3 to 12.
– Connect pins 6 and 7 to negative terminal of battery or ground.
Count 0 to 3
– Connect pin 2 to 8.
– Remove connection of pin 3.
– Connect pins 6 and 7 to negative terminal of battery or ground.
Count 0 to 4
– Connect pin 3 to 8.
– Connect pin 2 to 12.
– Connect pins 6 and 7 to negative terminal of battery or ground.
Count 0 to 5
– Connect pin 2 to 9.
– Connect pin 3 to 8.
– Connect pins 6 and 7 to negative terminal of battery or ground.
Count 0 to 6
– Find out yourself
Count 0 to 7
– Connect pins 2 and 3 to 11.
– Connect pins 6 and 7 to negative terminal of battery or ground.
Count 0 to 8
– Connect pin 2 to 11.
– Connect pin 3 to 12.
– Connect pins 6 and 7 to negative terminal of battery or ground.
Count 0 to 9
– Connect 2,3,6 and 7 to ground.
For resetting counter
Pin 2 and 3 should be momentarily connected to +ve terminal. You can use a push-to-on switch.
Check out all the counters
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how i can modify this circuit if i want it count from 0-99 which is using 2 seven segmenbt display??????
How to modify this circuit for two digit 7 segment display?
Thanks a lot! I was looking for 0 to 5 counter, and you have them all!
I have built the circuit with no pin modes and I can’t get it to count to 9.
I get 0 — 1 — 2 — 3 — 0
The pulse from the 555 is happening via the led flash.
Stumped