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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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I want to simulate a push button with a little circuit. I'm using an IC 555 as a timer. The button is in another circuit (different device), pin A has 2.4 V and pin B is GND, it does activate if I ...
Panamanian's user avatar
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I'm using the TI TPL5111 in one-shot mode to enable an LDO for about 30Min. My mission is to start counting 30Min when I detect falling of signal EXT_IND. According to the TPL5111 datasheet, the ...
Knowledge's user avatar
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I am designing a circuit that uses a 555 timer to output a 10% duty cycle pulse train. I don't want to get into the details of what this is used on, as it is not relevant, but long story short I need ...
Engineer1's user avatar
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http://electronic-projects.50webs.com/555-based-siren-circuit.htm the source online, but who knows the original designer. U2 is configured to have a much higher frequency than U1. U2 provides the ...
qwr's user avatar
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I have a device which has a part of that functions as a power failure alarm. This means, if my SMPS is not delivering power to my circuit then an audible alarm will sound off. This circuit is powered ...
Engineer1's user avatar
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2 votes
3 answers
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I am trying to implement a power-on delay circuit using a 555 timer. I referred to the circuit shown below: In my application: A switch is used to apply power. When the switch is closed, the input ...
zoghii's user avatar
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I’m building a USB IR blaster using a CH552T dev board, a Crowtail IR emitter, and an HS-S23B receiver connected to an ESP32. My goal is to send NEC protocol IR codes at 38 kHz using Timer2 for the ...
THIRUVENGADAM T K's user avatar
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I’ve been working on implementing DShot150 on an Nucleof4 development board using HAL drivers with DMA, driven via a timer. I followed the DShot using HAL drivers implementation and even extracted the ...
Santhosh's user avatar
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3 answers
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I'm attempting to make a 555 timer circuit with the capability of pausing the timer in a continous time-space. I'm doing this by disconnecting the timing capacitor from the circuit every time I want ...
Runsva's user avatar
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1 answer
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Context: looking to generate a 1.5MHz square wave. In the MIC1555/7 datasheet there is an example astable oscillator circuit on page 2, which lists the output signal frequency as 8kHz for R=1k and C=0....
InBedded16's user avatar
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3 votes
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When wiring a 12V pump to 2 low-side PWM DC motor drivers in parallel, when is it necessary to add any of the four diodes shown in the diagram below? Sometimes, both drivers will be PWMing. Sometimes ...
Zade's user avatar
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Recently, I am using more and more microcontrollers for simple projects and one thing that has struck me as odd is that the hardware timers available on microcontrollers allow easy fixed-frequency PWM ...
tobalt's user avatar
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I created a circuit and made the schematic in EAGLE. The idea is I have an LED (and a relay also) that turn on via a NOR Gate (which I built out of 4 NAND Gates). If both the input from my comparator ...
Erik Vincent's user avatar
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I want to generate PWM with tim8 CH1 and CH1N (complementary) but I have an issue. CH1 PWM first pulse is 2x what it must be. My APB2 clock is 84 MHz and I am generating an 500 kHz PWM. How do I ...
DidiNano's user avatar
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I am learning how to set up interrupt and low-power features on STM32F446RE Nucleo board. So far I managed to configure interrupt of general-purpose timer (TIM3) and successfully wake ARM CPU on the ...
T.H.'s user avatar
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For a video "sync combining" circuit, one might want to generate pulses of (horizontal period - HSync width) fairly precisely. If the pulse is too long, horizontal sync might be lost during ...
NickJH's user avatar
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It works well in Proteus (Simulation), but when I implement it, it doesn't work. I'm sure that the hardware connections are correct. Also, the 7-segment doesn't display, for example, the number 2 ...
Mahmoud Elkomy's user avatar
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I'm currently doing a project in Multisim and I've come across a weird behavior in my 555 timers. When I have the monostable (the output should be high for 11 seconds) and the astable timers on the ...
Abril Calatayud's user avatar
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I'm hoping someone could help me out here. I need the name of a circuit I can google or a schematic, that when a button is pushed; there is a 3 second delay, then a LED turns on for 5 seconds then ...
Alan Toline's user avatar
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I'd like to trigger a GPIO when detecting a falling edge on my PWM. I want to do all of this within the same timer. For example: Timer 1: PWM Generation Timer 2: Input capture indirect mode or ...
B.Adlane's user avatar
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I have a MOT spot welder and I'd like to add a double pulse option with adjustable pulse durations, and delay. I have two 555 chips on hand that I'd like to use. I know there are other chips and ...
nocandopdx's user avatar
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2 answers
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I'm a high school student working on a time switch project and could use some advice. Should I use a 4-pin or 5-pin relay for this circuit? I noticed that 4-pin relays are hard to find on Amazon. Also,...
Achyuta Dixit's user avatar
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According to the literature has 6 main pins which have power, trigger, output and ground with the other two main pins being for a resistor that sets the time that the output remains high for. I guess ...
Mark Giblin's user avatar
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The output of the circuit is supposed to go low for 100ms when the input goes low. But when I power it on, at that instant, the output goes low as well. The output is connected to another PMOS that ...
paresh kudrekar's user avatar
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3 votes
2 answers
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I’m currently working on a project, for which I’m developing a system that should run for 24 hours. After 24 hours it should turn off to lessen the power consumption. I’m trying to develop this system ...
Aki's user avatar
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I want to use the STM32F103C6T8 with a base clock of 72 MHz and a timer using an external clock source with a varying frequency of 6-10 MHz. The output should be a PWM with a 25% duty cycle and a ...
Hitab's user avatar
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I am trying to set up timers on STM32H7S3L8. Here is clock configuration: I am using TIM6 and TIM7 and as I understand both of them get clock source equal to 300MHz. I have set their prescalers equal ...
Nicolas Tsagareli's user avatar
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3 answers
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I'm an amateur analogue circuit lover and online learner person. I'm building a system which starts every four hours and closes itself. My system is ready but needs a signal to start. I've been ...
Hakan Gözübüyük's user avatar
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Using a microcontroller timer, is it possible to produce the following signals: With the following constraints: use only one timer (can count up or down or up and down) output compare channel has ...
user930473's user avatar
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1 answer
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I'm working on a project where I need to generate a pulse with a desired frequency, which can be adjusted through three different modes. The modes are as follows: Frequency remains the same. ...
BNC's user avatar
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1 answer
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I have an MSP430G2231 and I'm trying to get an ADC reading from port 1.5. I'm expecting a range of 2.0 to 3.3V, which I'm dividing to a range of 0.8 - 1.3V with a voltage divider. The divider is ...
Boyfinn's user avatar
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1 answer
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I plan to connect three 9g servos to the STM32F405RGT6 (datasheet) and need to select the appropriate GPIO pins for PWM output. Can I use pins PA8, PA9, and PA10 for this purpose, as these pins are ...
Robert's user avatar
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I'm doing my first project on STM32. My board is STM32H723ZG. I am trying to sample analog signal using ADC. I set its sampling rate with TIMER6 and transfer data directly to DMA. I am actually ...
Nicolas Tsagareli's user avatar
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2 answers
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Potentiometer is used as a voltage-divider type volume control. I'm thinking of using something like a ne555 timer, a transistor, and a pull-down resistor. Just not sure how i'd connect this all ...
delt's user avatar
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2 votes
1 answer
175 views

I am making a sound card with STM32H750 and USB3300. I am using standard Stm32CubeMX USB driver. To do that, I need to track the number of I2S sample rate clocks per SOF. The idea is to use TIM5 as a ...
sx107's user avatar
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1 vote
2 answers
141 views

I have been using a 555 timer as a MOSFET non-inverting driver for a few months now. It really is a signal amplifier for an Arduino Nano (which outputs 5 V) and it amplifies the signal into the gate ...
soupflood's user avatar
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2 answers
132 views

When I synchronize two computers' system clocks up to 0.5 ms precision using NTP protocol implementation, it reports several tens of milliseconds skew in less than 10 minutes, and up to 3000 ms skew ...
ivan866's user avatar
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1 answer
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I have this circuit however I need to make a timer that works for 2 - 2.30 hours, so I have this circuit here: But I need to know how much should R1 and C1 be approximately to fulfill this job? Note: ...
Hazardous Voltage's user avatar
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0 votes
1 answer
102 views

I'm trying to use an STM8S003 chip for a pretty basic function, so I'm standing up the TIM1 peripheral to use output compare. Everything seems to be functioning correctly, except that the pre-scaler ...
InBedded16's user avatar
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0 votes
0 answers
66 views

I have an old keyboard which I use for decorative purpose. It has RGB lights which turns on for few seconds when a key is pressed. I want to keep them on at all times. How to achieve this? Can I ...
Saransh Bairagi's user avatar
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0 votes
1 answer
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I'm working on a microcontroller board that also features a couple of motor drivers which can be controlled using PWM signals. I also intend to precisely control the positioning of the motors using ...
hdaniu's user avatar
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-1 votes
1 answer
134 views

I am trying to send a message through UART based on Timer 6 interrupt on STM32L432KC microprocessor. The prescaler is set to 39999 and the auto reload is set to 19999 to get an interrupt every 10 ...
kefecik's user avatar
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1 vote
0 answers
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In HT12E we continuously transmit even when the input data pins are not changed.My problem is battery optimisation. I am transmitting only ON/OFF switch state through HT12E based RF module and Since ...
Anandhan A's user avatar
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0 answers
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Ive made a code for reading SENT sensor using TCB interrupt with event system. It works 90% of the time, but those 10% seems like it doesnt read correct high pulse duration, mby someone will see, what ...
Ralfs Volis's user avatar
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4 votes
3 answers
889 views

I have a circuit which has an RC dependent timer. I got two types of ceramic capacitors, both of them have literally the same value, but different voltage ratings: 1206  4.7 μF, 25 V capacitor 0805 ...
Hazardous Voltage's user avatar
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0 votes
2 answers
241 views

I have this circuit which measures if there is under/over voltage from the AC mains voltage and it consist of two parts: Part one: measuring the input voltage (I had it cropped because it is not the ...
Hazardous Voltage's user avatar
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1 vote
1 answer
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I'm designing a timer circuit that detects white cards with black stripes, which needs to be inserted in a specific position to activate. The black stripe sensor must remain disabled when the card is ...
John Madureira's user avatar
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2 votes
2 answers
829 views

I'm not an engineer or electrician, but trying to figure out how I can make this timer relay work for my project. Or figure out if there's a different timer relay better suited to the job. The relay ...
pilibeen's user avatar
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1 vote
1 answer
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I am designing a circuit with two LEDs, where one LED will blink when the output voltage (Vout) is 5V and the other LED will blink when Vout is grounded. I am confident in the functionality of the ...
Ewheel's user avatar
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1 vote
0 answers
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I use an ATSAME54P20A. I want to use the timer TCC0 as a counter. An important function is that I can stop and start the counter again without it resetting itself. According to the data sheet, the ...
userName's user avatar
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