# Questions tagged [counter]

A digital circuit that literally "counts" - it progresses through a sequence of states that are representative of some value. It need not count in a natural progression i.e. 1,2,3,4,5 etc. to be considered a counter (i.e. you can have different count sequences) each count value need not be of significance to other circuits (i.e. sometime it's sufficient that the counter counts to some value and then stops). Examples are Gray code, up/down counter.

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### How to choose resistors in a decade counter circuit?

I'll start off by stating that I am a novice. I'm trying to figure out how to use a decade counter, so I've constructed this circuit: It worked fine, but now I'm wondering how it was decided to ...
287 views

### 4-bit Self-correcting Johnson Counter on D flip-flops

I had a task assigned by my teacher to implement self correcting Johnson Counter. The task goes this way: Design a self-adjusted 4 bit Johnson counter. Counter must be implemented on d flip flops ...
142 views

### Why is my seconds counter in verilog jumping values behaviour?

I am implementing a seconds counter on the Altera DE-1 Educational Board powered by the old Cyclone 2 FPGA. My plan is to make a 'down-clocker' that takes the on-board 50 MHz clock and produces a 1 Hz ...
80 views

### 74LS74AN Binary Up-Counter

I have an issue with my binary up-counter using a 74LS74AN D-Flip Flop The issue is the following: I am trying to toggle the flipflop state by sending it a 1Hz Square wave (5V Peak) to make it toggle ...
83 views

### A 4bit counter that goes up and down

I am kinda new to the website, I just came across it after looking for answers for such a long time. I have an assignment that asks to add an input bit to your circuit from the circuit I created that ...
148 views

### 8-Bit Program Counter Implementation

I'm trying to construct an 8-Bit Program Counter, in Logisim. It currently has functions LOAD, which makes the 8-Bit input (A0-A7) appear at the output (S0-S7) on the clock pulse: Loading 1 as input: ...
54 views

### Designing a counter

I want to design a counter which doesn't increments value every rising clock pulse(assuming positive edge triggered). Say I have a FSM which has 4 states . Only after traversing of the 4 states , I ...
62 views

### How can I improve my 3 decade counter design so that it counts sequentially in Verilog [closed]

I am attempting to build and simulate a 3 decade BCD counter by cascading 3 decades counters that produce an output to indicate when the count of 9 is reached. My design works, in that it counts ...
92 views

### Counter and elementary logic gates

I need to create a counter that counts down from 59 to zero. For that, i created a simulation in Proteus software where i used 4510 IC as a down counter and created the following circuit. Now, i ...
56 views

### LED Chaser using counting IC

Total beginner here, I'm trying to build an "LED Chaser" circuit using an IC (CD4022BE) that counts to eight (from zero to seven, and then it wraps around and goes back to zero). Before trying to ...
36 views

### Parallel 4221-BCD counter on D-triggers

I`m new on it, consider it please. I have to build a 4-bit counter in 4221 bcd using D triggers. Learning about triggers, and seeking for completed schemes, I made the next one: Took the classic ...
61 views

### Enterprise model blinkers - two fast flashes and pause for 3s and repeat LED circuit (with 555 and/or 556 and/or 4017) [closed]

I'm building a Revell Enterprise Into Darkness model with LEDs and I need help with circuit that makes two fast flashes, pauses for 3 seconds, then repeats. as seen in the movie. I have searched and ...
142 views

### Directly connecting LEDs to IC outputs

Forgive the amateur question - I don't know anything about electronics. I was not able to find any similar questions on this board, but that probably has to do with the fact that I know so little ...
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### Measuring accuracy and counting frequency?

The machines at my workshop have meter counters with hall effect sensor switches, which convert shaft rotation to electronic pulses. The switching signal is send to their PLCs' high speed counter ...
116 views

### Designing a special 4-bit counter with flip flops

This is a normal design of 4-bit counter using D flip-flops The outputs Q0 to Q3 are connected to diodes. I want to modify this counter in such a way that it follows the following counting sequence ...
57 views

### Help using a 555 timer to increment counter that needs to be pulled low

I need a little help with a project. I'm very new to building circuits. I have this NE555 duty-cycle pulse frequency adjustable square wave generator module, which I have connected to a 12V DC source. ...
169 views

### Need help with a pulse/counter input circuit on hall effect flow sensor

I am having trouble wiring up a flow sensor to my pulse/encoder/counter card. I am using a hall effect flow sensor that works fine when wired to a digital counter display. However, when I try to ...
77 views

### How to create continuously incrementing counter in structural modelling?

I made the below counter and stimulus/testbench and it works fine. ...
72 views

### Calculating voltage drop and current use of an IC

I’m trying to figure out the voltage drop and the current used by a Johnson counter from a data sheet and am feeling a little lost. In particular I’m looking at a CD4022B from TI. I’m looking at ...
46 views

### Push button counter from 0-999, but increment in 1, 4 and 6

I would like to create a push-button counter from 0-999 using 'BCD Decade Counter' and a 'BCD to 7 segment Decoder/Driver' the total of button presses will be displayed on 3 x 7 segment displays (...
651 views

### Resetting two CD4017 counters simultaneously, only one resets

I am working on a simple 24-hour clock based on the CD4017. To reset when the clock reaches the 24th hour, two diodes are used to produce an "and" logic when the 2 digit and 4 digit LEDs receive a ...
51 views

### Driving transistors without using MCUs

I'm trying to drive transistors with just a push of a button without using a MCU. The circuit I drawn drives different transistor on every button push and resets back. First part is a debounce circuit ...
94 views

### Micro controller clock speed requirement for delay measurement

I am trying to measure the absolute time between two 1Hz clocks (GPS PPS events) to within 50 nanoseconds. I do not necessarily care which clock occurs first, I am only looking for the delta T between ...
59 views

### percision timing ratio of multiple lights blinking with different durations and intervals

I'm learning a lot of this as I go, my background is mostly in programming. I'm trying to setup a timing circuit for two sets of lights going into a model, and am trying to determine the best way to ...
5k views

### Output frequency of asynchronous and synchronous counter

I read that output frequency of asynchronous counter will be $\frac{f_{in}}{2^n}$ where $n$ is number of flip flops and $f_{in}$ is input frequency. In synchronous counter will the output ...
26 views

### Tracking ADC Control Logic Not Counting down, only up?

I'm working on trying to build a "tracking" type ADC from individual components. Shown below is my schematic using the parts available in Multisim. The design is based on the 74LS191N 4-bit Up/Down ...
523 views

For a school assignment I have to make a counter, based on a 32-bit adder, that increments with 1 every clockcycle if 'enable = high' and 'reset = low'. When I try to use the adder in my counter ...
88 views

### Making a synchronized, rising edge reset signal to a decade counter [closed]

I made a decade counter as in the picture above, but i still would like to build a signal/button that would make the counter reset to 0 after the clocks rising edge when the signal is at 1, and to do ...
597 views

### How can I design a finite state machine that counts according to this sequence?

when X is equal to 0 and when X is equal to 1 I don't understand how to write the truth table. I understand that when X=1, it means that the machine counts in the following order: 1,3,2,6,4,C,8,9 ...
142 views

### Problem with adding two counters in series on an FPGA

I am using Verilog in Lattice Diamond IDE with a lattice MachXO2 7000HE breakout board. I built a basic counter with a limit input which generates a variable period clock output. It works fine on its ...
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### Altera FlipFlop stuck at GND

I'm trying to make a counter that counts: 0,1,2,3,4,5 I need this for a frequency divider of 6 So I made this table: From this I get: J0= 1 K0= 1 J1 = NOT Q0 AND Q1 K1 = Q1 J2 = Q1 AND Q2 K2 =...
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### Arbitrary Sequence Counter Up/Down

I've been having problems with one particular exercise at Digital Logic Design. I can't quite put my finger on it and i can't figure out why. I have to design a up/down counter on a given sequence. ...
99 views

### Problem with using Timer Counter interrupt on Atmel ARM

I'm using an ATSAM4E16C microcontroller and i need to get a 1 millisecond tick. I want to implement this using the timer counter module to trigger an interrupt. The clock frequency is 96 MHz, so using ...
265 views

### Creating a Counter in Verilog for Flashing LED on Lattice Starter Kit

I have a lattic X03LF starter board with 6900C FGPA. There are eight LED available on this board and a push button. The goal of my code is to design a 8 bit counter that increments whenever a button ...
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### A problem with counter [closed]

I have PWM generator built on 74HC04BQ inverter. Pulse frequency is changed periodically by analog switch TS5A3153DCUR over 600 ms, frequency values are 44 kHz and 29 kHz. Binary ripple counter ...
107 views

### Clock frequency of FPGA circuit and 4-bit counter [closed]

I have implemented a 4 bit counter using HDL. Now I have downloaded the code to an FPGA kit with a 50 Mhz oscillator. This means that the clock period will be equal to 0.02 microseconds and ...
8k views

### How to count the number of people in a room with a specific sensor? [closed]

I want to count the number of people in a small room. According to my research, there are person-counters in the web but I want to use the number of people data for coding hence I must transfer the ...
510 views

### Why ripple counter increments on each 8th pulse

I have connected the ripple counter CD4020 to an Atmega328, which sends a 50ms (low logic level) pulse to the CD4020's input each second and monitors all of its 12 outputs. However instead of ...
493 views

### A binary counter problem

How can I create a digital counter that counts from 000 to 111 and automatically starts reverse counting from 111 to 000. I have tried with simulation it works fine, but with actual ICs I am not ...
48 views

### How to design a module that counts logic 1s in multiple inputs in Verilog?

For example, I have two inputs, whose value can be either St1 or St0. The changes of states are synchronous to the same clock, say 1MHz of frequency. I want to design a Verilog module that counts how ...
1k views

### Resetting CD4017 Counter when power source is OFF

I found the circuit below online and I have two questions about the reset switch. Does it help to click the reset button when power is OFF? I mean, does it clears the memory of the CD4017 chip when ...
73 views

### How to generate a clock for my ring counter?

I want to run a 4 phase switched reluctance motor at low speed. The expected conduction sequence for the motor winding(y, r, b, g) follows the output similar to that of a 4-bit ring counter and thus I ...
282 views

### Why can't I implement a frequency divider using a mux in this way?

I found an interesting interview question for FPGA engineer online - Implement a counter with Mux, so I decided to try to do that. I tried to keep it simple and so implement a counter with two bits, ...
9k views

### Very high speed counter (around 1.5 GHz to 2 GHz)

I am thinking of a device that can measure the distance of an object from a sensor using a radio transmitter and receiver pair. I'm thinking of using a counter at the sensor side, with a fixed-...
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### 74193 stops working after compilation on another PC (QUARTUS)

I got a Quartus project with a mod 22 counter using 74193 from a friend. It works just fine when I run a simulation before a compilation on my PC, but after I compile it on my PC, it stops working ...
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### I’m having trouble solving this digital circuit. Help!

I need to design sequential logic circuit from this state diagram using only 2 D-latches. And this is my attempt: If I put it in the simulator it just gives me error and wont count. I assumed that ...
80 views

### Multiple sensor circuits connecting to one counter and a 555 timer IC [closed]

I have to use a 555 timer in a context where I have multiple sensor circuits connecting to one counter circuit. The idea is that the counter should indicate how many activated sensor circuits are ...
95 views

### Frequency Ratio Circuit

I'm attempting to design a circuit that will determine the frequency ratio between a known reference frequency $f_\text{ref}$, and an unknown signal frequency $f_\text{sig}$. The signal frequency ...