I have a design for a counter that counts from 000 to 999 UP and Down on a LCD using a 555 timer to supply the signal CMOS ICs 4027 with a 4060 for the timing gate, 4029 Up/down counter, and 4543 for the LCD. However I am unsure why it will not count or at least display on the LCD. The only feedback I get is the blinking decimal and middle notches and not a full digit.
The counter is set up based on the diameter of the wheel that will be used on a Tape measure which equates to A mod 6 counter because the amount of pulses per revolution of the wheel.
Is there a problem with my Logic for the 4027 Gates?
Can someone examine the circuit and tell me if it will count from 000 to 999 with a leading zero?
Also can someone also tell me perferrably with a diagram how and where to wire in a Reset switch?
Where to wire in LEDs (2) to show max and min terms ?
Also where is the Phase A and B signal located in this circuit?
You do know that count to feet is not a linear function. I had to deal with this, but I had help. I don't have the equation any more. It does use initial diameter and turns. As the tape winds the diameter increases. It is solvable using integration. and s=rθ
If you know the tape thickness and the initial and final tape roll diameter you can calc. the tape length. Then each reel revolution adds a tiny but changing amount of tape length.
For a 6" reel with a 2" hub the tape area A is PI([3^2] - [1^2]) sq. inches. With a tape thickness of t the total tape length is A/t.
The first reel revolution n = 1 gives you approximately PIx2 inches of tape length and the last n = ? gives you ~PIx6, assuming t << hub diameter.