Questions tagged [timer]

Circuit to generate a signal at a specific time after a trigger event. The timing can be defined by an RC time constant, or by clock pulses from an oscillator.

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Using STM32F407 to drive 8 pulse pins

I have an application where I need to send send signals to 8 stepper drivers on my STM32F407 Discovery board. Each stepper driver requires an independent PULSE, DIRECTION, and SLEEP signal. DIRECTION ...
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Two basic timers on an STM32 don't work simultaneously

I have an STM32L073RZ and it has TIM6,7 basic timers. I need a timer interrupt. TIM7 works fine as I want, but TIM6 doesn't. I tried different settings of prescaler and counter: same as TIM7, almost ...
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how to set 4 timers on ATMEGA2560 to output signals

I am using proteus and C language to compile the code. I have 8 input signals, 4 timers and using it I need to output 4 signals (PF0-PF3). My pin PF0 refuses to work with T2 timer. I can't understand ...
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PWM on STM32F411 is not working using timer1

I am trying to use this code to control brightness of a LED using channel 3 of Timer 1 (PA10 pin) on the STM32F411: ...
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What type of registers/timers do PIC MCUs use?

Timer1 has the following features: 16-bit timer/counter register pair (TMR1H:TMR1L) What I can't understand is that I couldn't find on the Internet what actual sequential circuit is hiding beneath ...
Awe Kumar Jha's user avatar
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"Click-to-reset and hold-to-bootloader" button design scheme for an ESP32-S3 development board design

I'm trying to design a development board using an ESP32-S3 MCU. The goal is to have the boot select button act as the lone button as well as do this with a completely analog design: When the ...
Gigoiy's user avatar
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Impulse period measurement using NUCLEO-F401RE board and input capture mode

I have an encoder sensor, which produces high and low levels. I want to capture the period (or frequency) of these levels using NUCLEO-F401RE board and input capture mode for TIM1. I don't want to use ...
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Need help for the definition of timer function

I've found below code that belongs to the timer declaration function but the definition is hidden by the author. Can anyone help me to provide a definition for the same? I want this to be utilized in ...
Ramandeep Singh's user avatar
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Timed momentary switch modifier

I would like to design a circuit that adds a power off delay What would you suggest, is it possible to solve that basing only on the circuits batteries? Modifier from the market uses own 9V power ...
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Configuring an astable 555 timer to milliseconds

I am working on a Tinkercad project and I would like a 555 astable clock for it. I am trying to configure the astable 555 timer for every millisecond (or something close). I don't know how to do it, ...
some human's user avatar
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How can I implement my binary countdown from the output of JK flipflops to two seven segment displays from 15-0?

I am currently making a 2-way traffic stoplight. The stoplight signals are now fully functional. I have no idea how I can implement the 4 bits (not including my MSB because I just need to display 15-...
Yuan Marquez's user avatar
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3 answers
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Timer circuits - difficulty analyzing

I'm looking for timer circuits without 555 IC and trying to understand them. There are some examples that seem easy to understand, but cannot wrap my head around the others. simulate this circuit &...
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NE555 Delay On Off Timer Schematic

I'm trying to make a timer that turns on at a certain time and turns off after 3 seconds, i found a circuit in youtube and made it in proteus, but the output is not the same. Is there a problem with ...
Noobielectrix's user avatar
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Is there a component that can record circuit on-time without a battery? [closed]

I don't know if such a thing exists already. I'm looking for a component that can record how long a circuit has been powered on. Kind of like the "change filter" light on a fancy vacuum ...
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Adding on and off state in a 555 timer clock circuit

I'm making a clock signal for my circuits, and I'm utilizing the 555 timer for this. I made this circuit below which outputs a clock signal. And now I'm trying to figure out how can I add on and off ...
Noobielectrix's user avatar
2 votes
7 answers
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A circuit that temporarily keeps the toy on after pressing the button

I'm working on a project to add a time delay to the button, so that when pressed, the toy plays for, say, 15 seconds and turns off. The toy is intended for children with disabilities and sometimes ...
JSK's user avatar
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Runtime display for last 24 hours

I'm working on a BRX PLC connected to a C-More HMI. I'm using Do-More Designer to write ladder code. I'm looking for ladder logic that will give me the runtime of a circulating pump in the last 24 ...
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15 minute timer between battery and main switch [closed]

I am making a 15 minute timer between battery and main switch such that it doesn't run unnecessarily. I want such that if we press the switch in between it resets to 15 minutes again. I tried using ...
Gaurav Kumar's user avatar
1 vote
1 answer
128 views

Can I use a different channel of a timer at the same time?

I am using AVR128A for a project. It comes with two 16-bit timers (Timer 1 and Timer 3) and two 8-bit timers (Timer 0 and 2). Timer 1 has two channels whereas Timer 3 has three. I have all the timers ...
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555 Timer Delay on Trigger

I am trying to build a circuit which will have an IR sensor. The type of IR sensor is active high. I need to connect the output of the IR sensor to a circuit which will give low output when the sensor ...
kailash kumaravel's user avatar
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Words on 7-Segment Displays [closed]

I'm working on a project that uses three 7-segment displays. My aim is to show the words 'CAT', 'DOG', and 'FOX' using the 3 displays, one word at at time with a 1 second delay in between. To achieve ...
Michael's user avatar
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555 circuit with high input and pulse adjustable output

I found a 555 timer that works with a pulsed input and gives an adjustable single pulse output. (see below). I need the same circuit to work with a constant high input. 8ms input high 4ms output high ...
Energy Hack's user avatar
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Oneshot Circuit Design Improvement

Question is related to my this question here. I want to trigger a buzzer for 500ms to 1sec whenever a switch is opened, answers on that question didn't produce satisfactory results so I came up with a ...
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One Shot buzzer

I want to drive a buzzer for 500 ms when reed switch opens, in simple schematics, when reed switch is closed it keeps Q1 pulled high (maybe I need a resistor too) but the problem with the design is ...
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STM32F407 ADC with timer trigger not working for some reason

For STM32F407 discovery board, I tried to establish ADC for measuring voltage at a point, using timer to trigger the ADC, every clock cycle. Somehow I have missed something, because the timer clock is ...
DaveFenner's user avatar
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598 views

Delay with timers for a non-blocking delay

I need microsecond/millisecond delay in my project but I don't want to affect the process flow. I am using an STM32G4. I am using a timer for microseconds delay. This is the function: ...
Sireesha's user avatar
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182 views

How to boost the output voltage of my 555 timer design?

I'm fairly new to the world of electronic design. I'm building an astable 555 timer with the limitation being I can only drive it with a 3v coin cell battery (design has to be lightweight). I've been ...
Eric D's user avatar
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Capture/compare interrupt flag resetting without reading the CCRx

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Replacing three-wire timed switch with a microcontroller

The building is surrounded by 6 lights and 4 buttons, 3 of which are illuminated. Right now the circuit is managed by a Perry 1IT 1051. Here are the official schematics: While I'm happy with the ...
Davide Beatrici's user avatar
2 votes
1 answer
104 views

Opinion on Solution for minimal CPU use for STM32 based precision external ADC conversion timing

I have been working on a data acquisition system that requires fairly high sample rates given the resolution and dynamic range requirements. The front end performs well, but to avoid wasting large ...
Luke Gary's user avatar
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Is there an extremely simple circuit using 3V to have LED only on for 30 seconds?

Apologies in advance for this probably-grade-school-level question, but, of all the silly things, I want to make a light-up card that turns off after about 30 to 45 seconds. Fading would be a bonus ...
BirdsInMyBrain's user avatar
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STM32 timer shared input Pin (Encoder & PWM input modes)

Can I share the pin (PA0) between timers TIM2 & TIM5 (GPTIMs)? Timers 2 and 5 can both use PA0 as an input, conveniently on ch1. Is there any issue with configuring both of them to use PA0 as ch1 ...
L Selter's user avatar
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1 answer
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Wraping of counter in input capture

I am doing an input capture on STM32F401RE on TIM1 CH1, CH2, CH3, CH4. On each channel when a capture happens the ccr1, ccr2, ccr3 and ccr4 will store the value according to the CNT register at that ...
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Simple timer circuit for LED

I have a hopefully simple question. I have 4.5 V battery-operated LED decoration that I want to turn on for 5 hours and turn off for 19, give or take an hour or so. Accuracy is not important. ...
Rob H's user avatar
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1 answer
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How to discharge timer capacitor quickly?

I have a simple timer in my circuit and I can't think of any solution to discharge C1 quickly: simulate this circuit – Schematic created using CircuitLab How can I discharge C1 in milliseconds ...
ElectronSurf's user avatar
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which mode is 555 timer in this case

This particular timer is made to turn off the load, after KEY1 is pressed long enough. I am not sure if it is in astable or monostable mode.
Domenico's user avatar
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3 answers
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MSP430 delay using timer with polling condition

Need help with this code, it is not creating any delay. I tried simulating this code in Proteus. ...
SlickDaDDy's user avatar
2 votes
1 answer
3k views

Does the ESP32 WROOM-32 have an internal RTC?

I am working on an ESP32 WROOM-32 now. My purpose is to have it read some data every 15 minutes, in between the ESP32 goes to sleep mode. Does the ESP32 have an internal RTC or timer? I searched on ...
Kuralmozhi's user avatar
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STM32H750B-DK ADC sample rate calculation

I am making an oscilloscope. I am using ADC with configuration like this: And I am triggering my ADC with 1 ms (at least I think it is (was always confused on how to calculate its tick, so I just set ...
LaCalienta's user avatar
3 votes
3 answers
464 views

STM32, how to create microseconds long custom pulses

In steady state the line (output) is high and we have to create pulses that are microseconds long and are low. It is going to be a custom sequence with different pulse lengths (for example the line ...
dsplover123's user avatar
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1 answer
153 views

Need 15 minute delay alarm [closed]

I need to use electronics to make a: 12v, ~60db, ~3second intermittent beep, ~15 minute delayed alarm, started by toggle switch, stopped by toggle switch. Analog or digital, whichever is smaller. Help ...
Rick DuRapau's user avatar
1 vote
2 answers
488 views

ON few hours OFF few hours timer circuit

I am very new at this, but I am looking for a simple circuit (no microcomputer please) that will turn ON an LED for 4-5 hours, then turn OFF for 20 - 19 hours. Then it will automatically repeat this ...
José Briceño's user avatar
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1 answer
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How to generate a single pulse circuit without using any MCU? [duplicate]

I have a 5V supply to turn my circuit on, and i need a one pulse circuit. The condition should be look like this; When the circuit energized with 5 V it should go low after t1 time and it should stay ...
Ufuk Özgür's user avatar
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Turn on LED for fix time when box is closed

I have a box which is used to put PCB in it when we are not using PCB. I want to turn on a UV blue LED for 1 minute when box is closed to cleanout the inside of box. I cant use limit switch as I don't ...
Zunuran Nasrullah's user avatar
2 votes
4 answers
174 views

Blue UV LED Timer Circuit

I have designed a PCB for mouth guard device and also its enclosure is ready in which PCB will be placed when its not in use. I want to use a UV blue light for UV sterilization inside the box. Now the ...
Zunuran Nasrullah's user avatar
2 votes
2 answers
69 views

Can these timer switches (relays) handle DC or will they arc?

I'm looking to add timer functionality to a 12V agricultural project. It's to turn a light and heat mat on and off at the appropriate times. I was kicking around eBay and found a few timer switch ...
totalconfusion's user avatar
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Help with using monostable one-shot multivibrator for limited time

Trying to develop a circuit that would know how to output a square wave with a duty cycle that would be controllable, and the duration would be between half a second and a second. Now I manage to make ...
Knowledge's user avatar
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LMC555 delay off timer, M20 motor drive, updated

The goal is to either just give a signal to the motor with momentary switch, or turn on the toggle switch, let 3.7V motor run for a couple of seconds before 440uF is fully charged, after which voltage ...
Domenico's user avatar
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Connecting external clock source in PIC 18F4520

I require a delay of about 30 minutes using timers in PIC 18F4520. Using an internal crystal of 16 MHz, I would not be get desired delay from internal clock source. I thought of using external crystal ...
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RC Timing Circuit with Power Control for Drone Flight Modes?

Recently, I came across an intriguing circuit design in AOE 3rd edition that inspired me to try it out. The idea is to design a simple circuit that activates an LED for precisely 60 seconds after a ...
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