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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How is it possible to simulate a astable NE555 that drives four other one-shot NE555 timer chips, with the main astable at 2 hours, others 30 minutes?
Introduction
One Astable NE555 together with four additional one-shot NE555 are used from a 6-volt battery array (4 batteries, each 1.5 volt) to generate low voltage signals that are then used with ...
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Detecting missing pulses / minimum off-time in a fast pulse train
I’m working with a 3.3 V digital signal that behaves a bit like a timing puzzle.
Under normal operation, it produces a pulse train where both the high time and low time vary, typically anywhere ...
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What are the possible ways of producing custom sound without use of microcontroller?
I'm creating a project where I want to produce custom sound like music or of animals.
AFAIK it require at-least mainly the below components (ignoring electric components like resistors):
Battery
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Why we select Slave mode and Trigger Source for STM32 Timers to capture mode?
To measure a input signal width, generally documents say to choose Slave mode such as Reset, Gated or Trigger mode and then select a trigger source like TI1FP1. But I can easily measure pulse width ...
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STM32 timer generates first pulse way longer in PWM mode
In my application, I need to generate short ping pulse (~200-300 ns) and then square wave with defined frequency and duty cycle (~5-10 us period). I have timer configured like this:
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Project Laser LED with a NE555D timer - problem with the current
I am doing a project where I have three Laser LEDs. They need to send three different signal lengths. I am doing this with three NE555D Timer, one for each signal.
The problem is: I am not coming to ...
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RC Circuit for Timing Module
I am building a timing circuit designed to detect pulse signals and shut off a load (e.g. an LED) if the pulses are sustained, but allow the load to remain ON if the input is a steady DC 12V.
Project ...
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Correcting flaws in this 555 module for a timer
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 ...
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TPL5111 System timer questions regarding to edge detection
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 ...
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What is the Longest Time I Can Set an Astable 555 Timer?
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 ...
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Theory of dual 555 timer warbler circuit
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 ...
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How to Check For Sustained Input Before Transmitting a Signal
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 ...
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555 Timer Power-On Delay with Switch and Relay
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
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Why does my CH552T NEC IR sender sometimes produce incorrect codes on an ESP32 receiver?
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 ...
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Sending DSHOT frames from a Nucleof4 development board to an esc
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 ...
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