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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

timer

  1. F

    Making a timer on delay and off delay without microcontroller

    I am new and want to make a compact circuit without a microcontroller. The idea is when you push the button/switch, it will delay the timer for at least 6 hours. After that, it will activate the motor for 20 seconds and loop forever. I am thinking of using a 555 timer with a 1000uF capacitor...
  2. K

    PWM generation

    Hi! I've just read this project and I would like to know where I can find the formulas he uses ... in which file/datasheet. Thanks.
  3. M

    Need help with a simple project involving a timer

    I wanted to make a small random timer like this one (https://creativetechguy.com/utilities/randomtimer) in a small box. My goal with this would be to use it for practicing starts on a dirt bike, by myself. I would, in theory press a button and it would start a random timer and once that timer is...
  4. S

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  5. J

    LED Lights and Timer all Battery Powered - HELP

    good morning, first post... I have a small project that i'm trying to accomplish and i'm am not very good at electronics, so I've come to all of you. Here's my goal; I"m trying to power (2) rolls of LED strip lights for 3 hours a day, solely by battery. The project will run in a display...
  6. H

    Generate the Delay using Timer0 interrupt with Lpc2148

    Hi,All i'm using lpc2148 ;I have generate different hard core delay (as per needed) in my code,but sometimes my code is stucking into hard core delay.So i want to generate delay using timer0 interrupt like i needed millisecond and second and microsecond.So please anyone suggest me...
  7. R

    Newbie needs circuit design help for automotive timer project.

    Hi Guys, I am embarking on a new project to design a circuit for an automatic vehicle signal actuator. Outline of the project is this: The problem. I have a car that has indicators operating on a standard 12v on-off-on toggle switch. As you can imagine this switch gets left on occasionally...
  8. M

    Key tied to two GPIO pins not functioning correctly

    I'm posting this here because it may be more of an electronics issue. Anyways, I have a program which calls the dkey function to try to get a value based on the key pressed. I have three keys. Two are tied to their own GPIO pins and the third key functions exactly the same as the other two...
  9. A

    fire alaram sound using PIC16F886

    I am coding on pIC16F886 IC. I am trying to generate Fire alarm siren with PWMsignal . I have few questions as below. I copied code from **broken link removed** My spaker circuit look like this video , I am sending PWM pulses instead of audio Input mosfet circuit I could able to produce based...
  10. D

    Simple 555 timer with delay after trigger release

    Hello. I am new to this chat, so I hope this is the right forum to post to. I have the idea to use a 555 to build a small triggered timer with an 'after release' delay. I have been google-ing but can not find the right schematic/design that looks to work for me, so I will try this forum :)...
  11. R

    bi-directional soft start for childs electric car

    I've retired from an electro/mechanical test job so now I work on my grand daughters toys(that's what grandpa's do you know :-). I need help with a soft start controller to prevent the jumping that her electric car does when she drives it... at 5 years, she's afraid to use it because of the...
  12. throbscottle

    minute/second timer

    I'd like to make a little programmable timer to countdown minutes and seconds. Doesn't even have to be particularly accurate. I have a 16C57 (bought long ago) I can use and a 16F57 to test on, which I know are ancient but still plenty adequate for this. It needs to (indirectly) drive a...
  13. I

    Timer0 for generating 1 micro second

    Hi, I used the bellow code for generating 1 microsecond in codevision: include <mega32a.h> #include <delay.h> #include <stdbool.h> #include <io.h> #include <stdio.h> static void handleInterrupt(); int i=0; int c=0; int nReceiverInterrupt; unsigned long nReceivedValue = NULL; unsigned int...
  14. Cribey

    4 x manual set timer for pump control

    Hi All, Total Newb here in respects, but have soldered boards before and have an extremely basic understanding of electronics. I am would like to design a pump timer with 4 separate settable pot timers; 1 timer On for X seconds 1 timer On for Y seconds 1 timer On for A seconds 1 timer On for...
  15. U

    Reaction timer

    Hi, I don't have very much experience, and I am more than willing to do the research to complete my project. If I can get some assistance into the right direction I would greatly appropriate it. I'm would like to build a circuit with 5 LEDs that randomly flash for .25 sec to 1 sec +/-. With...
  16. J

    555-4026b-7segment Counter Circuit.

    So. I have started a project on creating circuit that would be able to count money that I could use. The circuit would be able to count from 0-99 A circuit very much similiar to it can be seen here: **broken link removed** 1) Onthis link you can see a circuit with one segment requiring one...
  17. J

    555 input desense

    I have a small project using a 555 timer in a monostable configuration However, I need an idea on how to block or desense the input signal for a second or so after the timer returns to baseline state My output (a solenoid) generates a transient upon closing that immediately retriggers the input...
  18. A

    timestamp from a microcontroller in millisecond

    I am doing a project in keil uvision. I need to send timestamp from microcontroller (stm32f103rbt6) in Milliseconds to check events using C. I already found a program similar to this n it`s already in seconds n i need to change it from seconds to millisecond. i am new to microcontroller...
  19. D

    12v led turnsignals

    Hello, I searched around the forum, and didn't find anything that would help me with a project that I have going on. I purchased some LED strips that I am going to install on my car. The issue is that they are dual color, white and amber. The white is a running light, and then the amber is the...

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