Circuit to generate a signal 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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0
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2answers
44 views

PIC16 10hz timer with timer1 and 1Mhz clock

I need to increment a stopwatch at 10hz using timer1 on a PIC16F628. The external clock is 1Mhz, supplied by a packaged oscillator (EPSON sg8002db). With no prescaler, the value to set the timer to (I ...
0
votes
0answers
13 views

PIC16 timer0 clock calculations

I'm having trouble working out how to implement a timer using timer0 and a 1Mhz clock on a PIC16F628. I thought it would be like this: clocks/sec = 1000000 counter increments every 4th clocks so ...
-1
votes
2answers
31 views

Count external clock pulses for a predefined time interval (PIC16f877a)

I need to count external clock pulses for a predefined time using PIC16f877a. I don't know what to use, whether counter or timer or both. I don't know to use timer and counter modules of PIC16f877a. ...
0
votes
2answers
87 views

Is it possible to implement a fail-proof watchdog timer in software?

I want to add a piece of code for watchdog timer within my source code so that the board resets automatically when programs hangs. I am using Mediatek Linkit One board.
1
vote
0answers
26 views

How to set MSP430 Driver Library timerA configurations

I am using MSP430F5529 and MSP430 Driver Library. As you can see, I set upMode timer configuration, compare mode configuration and enabled the initial interrupts. However, timerA interrupt is not ...
-5
votes
0answers
60 views

How can I simplify this circuit? [closed]

Can this circuit be simplified? If so, How?
0
votes
3answers
47 views

Timer sequence with delayed off and long trigger pulse

Attached here below is the input and out put sequence that I am trying to achieve with a timing circuit. This looks like something that might be achieved with a few monostable 555 timers, but I am ...
0
votes
1answer
62 views

How to calculate the Timer Preload Properly on PIC32MX575F

I am trying to achieve 1 second on a timer in PIC32MX575F but somehow I am not reaching what I want. Some people says I have to look into the the PLLDIV, some other people says I should look into the ...
1
vote
2answers
112 views

Electric Timer With a Micro-Controller

I am trying to replace some electric timers with some sort of a micro-controller based solution http://www.directindustry.com/industrial-manufacturer/panel-mount-timer-154503.html. I would like to run ...
0
votes
3answers
97 views

One month timer circuit

I need to cut a signal wire after one month from it start working. So I am looking for timer circuit that it work by small battery make a short circuit for my signal wire after around ( few days more ...
0
votes
1answer
41 views

Timer in ATmega2560

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0
votes
0answers
16 views

Muller TC 24.21 Timer Wiring Help [migrated]

A very basic question. I've just bought a digital time switch model TC 24.21 from Muller. According to the back of the timer it takes 230V~50-60Hz, and I'm a bit stuck exactly how and what to connect ...
0
votes
1answer
77 views

PIC32mx Timer5 not working

I am struggling to put my Timer5 working properly. I think I have enabled all the registers but the interrupt never occurs. I already put a break point inside in the FingerprintRun() in the asm("nop") ...
0
votes
1answer
154 views

Bit Banging UART PIC32mx

I am trying to bit banging an UART Port using PIC32MX with timer5 (the only available at this time) but I am struggling how to configure the timer for a Baud Rate of 115200bps. I don't want a flow ...
0
votes
1answer
30 views

Improve a simple “magnetic alarm” with a timer, to extend the ringing time

I've bought this simple "alarm" for a door: Which is internally provided with a reed switch; inspecting the internal circuit using a multimeter, I figured out that when the magnet is placed near to ...
2
votes
0answers
18 views

Need help with wiring [migrated]

I think I burned out one digital time switch and don't want to damage the replacement I bought. Can someone take a look at the diagram I drew and complete the wiring? The wiring diagram that came ...
0
votes
0answers
25 views

Proteus and AVR watchdog timer problem in turning off

I created a small avr (ATMega32) controlled circuit that needs to be reset every 1 hour. i used the procedures by atmel that also explained here on SO. The procedure works easily on avr micro, but ...
0
votes
2answers
57 views

Complicated photo-motion-timer switch design?

Here's my scenario: I have an array of 120V LED fixtures that need to be turned on for 10 minutes when the following conditions occur: It's dark out AND Someone walks in front of a motion sensor ...
0
votes
1answer
85 views

Circuit for automatic watch winder

Looking for some advice, completely new to electronics so please bear with me. I am currently working on a project to build an automatic watch winder, I have a 12v 10rpm motor which should be ...
0
votes
2answers
59 views

Unable to set time for PIC32 timers

I am using PIC32MX795F512L. Using Peripheral library to generate timer interrupt. Following is the code I am using: ...
0
votes
1answer
37 views

60hz Astable 555 timer circuit not oscillating

Yet another electronics newbie here :) I have tried to construct a simple 60Hz oscillator using a NE555 timer in astable mode, yet it does not seem to be oscillating. To test it, it has been connected ...
-1
votes
2answers
49 views

Switch on time limiter for a solenoid - will this circuit work?

Here is the problem i have: there is an electromechanical door chime (just a solenoid with a rod inside, which hits one brass pipe when switched on, and, propelled backwards by a spring, another when ...
4
votes
5answers
436 views

Handmade timer versus IC

Are there power consumption benefits between a discrete timer: astable multivibrator or some other; and an integrated circuit? I have a time dependent circuit in a project and I went looking for the ...
0
votes
2answers
51 views

Timer0 and Timer2 configuration on atmega1280

I want to setup Timer0 and Timer2 to control the intensity of the LED (L) on the Arduino Atmega1280. The frequency has to be 10khz and the duty cycle will be controlled by a switch or using serial ...
0
votes
1answer
37 views

Astable 555 Timer creates longer pulse when just turned on

I have a question regarding the behavior of a 555 timer circuit that I have made. It is depicted below. Now, here is some interesting behavior, I wrote a program on arduino that measures the ...
1
vote
1answer
34 views

555 Timer in Bistable Mode - Unexpected Behavior When Removing Power

I have a question regarding a 555 timer (TLC555CP) in bistable mode. Here is the schematic for the circuit in question. Now, this circuit works as I expect, when I hit the push button attached to ...
1
vote
1answer
46 views

What is difference between choosing OCRnA and ICRn in timer/counter CTC mode in ATMega2560?

I can't find any difference since both function the same role: define the top value so that timer will reset when reach this value. Both have its interrupt flag and interrupt service routine.
0
votes
1answer
27 views

ATMega2560 timer not increasing again after overflow

I want to generate waveform with f = 196 Hz using only normal mode. Here is the code I use. Whenever the timer overflows TOV1 is set and PIND0 will toggle. TOV1 is cleared after that and I wait for ...
0
votes
1answer
33 views

How to control multiple servo motors using two timers?

How can I control several servo motors using 2 timers in an ATmega16? I have searched for "servo bit banging" but no coherent post explains it fully. I found some code but I don't thoroughly ...
0
votes
0answers
23 views

On Delay Timer FC-31; How to Wire for Power On to start Delay Time?

Have a few FC-31 On Delay Trigger Timers. Want it to perform the following function: Power On (12VDC) -> Timer starts and times out -> Relay Switches. I cannot figure out how to bypass the trigger ...
0
votes
1answer
83 views

TimerA: How to get PWM in upMode configuration?(TI MSP432 Launchpad)

I try to use UpMode timerA configuration on MSP to get PWM with arranged Duty Cyle. So here is my code below: ...
1
vote
0answers
42 views

Only allowing input after x amount of time

I've been given a problem to solve - When the input is high (sensor), a timer should start which outputs high for 10 minutes (camera active). After 30 minutes, if the input is high, the process ...
3
votes
1answer
82 views

How to reset slave timer in gated mode?

How to make automatic reset of slave timer in gated mode in STM32 mcu? Summary: I've done synchronization between 2 timers: Timer#1 is configured as a slave in gated mode, Timer#2 is configured as a ...
-1
votes
1answer
69 views

Can timer2 control the pin “oc0” in ATmega32a?

On a board the input of a PWM controlled device is tied to the pin oc0 of an ATmega32A and it's not changeable (it's a PCB). Timer0 is busy and can't produce PWM to ...
0
votes
1answer
57 views

Help with using monostable one-shot multivibrator?

Above is the schematic I simulate in LTSpice. The input signal is a 8V pulse train with 100us ON time and 2250us period. The signal is fed as an input to the timer 555(NE555 in LTSPice). I'm trying ...
0
votes
1answer
37 views

Controlling a servo with Attiny85 OCR1B

I currently have a project where I need to control a servo using OCR1B. I already figured out how to use one with Timer0, but I can't use that for this project though. So, my questions are: - How ...
-3
votes
1answer
54 views

what IC is typically used in a switched mode power supply for pwm voltage regulation [closed]

So what is used? do they basically run off of a something like a 555?
0
votes
2answers
49 views

Help with timed signal circuit

I need to design a circuit capable of sending an on signal for 5 seconds and then shut off. The circuit needs to be initiated on power input from a usb port (5v ~200mA), and as I said output a few ...
2
votes
4answers
87 views

Unstable input to trigger LED after 10-15 seconds (12 V)

I have a small excavator that, when fuel levels get low, the warning light flashes irregularly (due to movement of the machine) until it stays on as fuel level gets really low. It's very annoying and ...
5
votes
2answers
281 views

AVR - Is the datasheet of the Atmega32 wrong? Timer1

I'm currently using an Atmega32 to keep time, so I carefully read the datasheet and configured the Timer 1 to generate an interrupt each second. According to the following formula on the datasheet, ...
1
vote
1answer
59 views

Calculating Timer Tick STM32F4

I'm trying to use the timer (TIM4) to log rising and falling edge times from an external sensor. I need to set the timer so that it ticks every 1µs and has a period of 40ms (so counts 40, 000 ticks ...
0
votes
1answer
59 views

Delay/Disable Output Pin On Power On Using Electronics

I have a module that outputs 3V, has a 'Common' terminal (GND), and a switch terminal. The latter two can accept a toggle input OR a pulse input, and internally it switches on a light. I have a touch ...
0
votes
3answers
73 views

Time delay dpdt relay using only pot, relay, and cap (discreet components and no transistors)

I am trying to design a simple time delayed relay circuit that uses only a potentiometer, 5V dpdt EM relay, a single sufficiently large capacitor, additional resistors (if needed), and ...
0
votes
1answer
62 views

Can I add PWM timers to a microcontroller externally?

I'm doing a project involving an LED matrix, and using PWM timers to be able to control the brightness. My microcontroller has 3 timers, and I need 4. Is there a PWM timer circuit, perhaps using a ...
1
vote
1answer
132 views

TIM 2 PWM Input on different pin STM32F072B Discovery

I'm trying to change the pin, that is connected to TIM2 in PWM Input mode for frequency measurement. I just compiled the example, tested it and it works on pin PB03, however, when I try to change ...
2
votes
4answers
54 views

Timer + voltage level translation circuit

I'm looking for a digital circuit whose behavior I will describe in a moment. It has one digital input (5V logic) and two digital outputs (12V logic). I'll hereby refer to these levels as 0 and 1, but ...
0
votes
1answer
58 views

Use AVR Atmega like a 555 for timer

I have a lot of AVR Atmega128P boards, and I would like to use it as timers WITHOUT PROGRAMMING, as example, just like 555 timers. Is it possible? If yes, how can I do that?
0
votes
2answers
90 views

What kind of microcontroller peripherals can help me to implement a timeout?

I am discovering the world of embedder software with microcontrollers. My need is to check that an input of my system stays high for 2 secondes for example. Since I am not very familiar with ...
0
votes
1answer
24 views

~12VDC+ Automatic Dimmer Switches

Most automotive vehicles typically have their interior lights fade out 30 seconds or so after the doors are closed. The way I understand it, closing the door will usually depress a momentary on/off ...
0
votes
0answers
46 views

NE555 Timer working only with B20 Buzzer

I have been new to electronics and was working with NE555 Timer. I connected the circuit as the image below: Resistor on pin 8 is 220 Ohms Resistor on Pin 6-7 is 1000 Ohms Capacitor on Pin 6 is ...