Questions tagged [trigger]
A type of oscilloscope sweep in which a *trigger*, or waveform characteristics matching a user-specified condition, will initiate the sweep. A trigger can also be an event, such as a pulse, which causes a circuit to begin performing some action.
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I would like to build a delay circuit
I would like to build a latching relay control circuit, controlled by MCU.
I'd like to implement the following:
The idea is from here: https://pdfserv.maximintegrated.com/en/an/AN3288.pdf
The relay I ...
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Capacitor discharging in a low power active-high pulse circuit
Team, Thanks as ever for your wonderful support. Long time listener, first time caller.
I trying to make a low power active-high pulse (4-8sec RTC interrupt) when a switch is pulled to ground for up ...
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Signals below trigger level are still captured by the oscilloscope
I use NI's oscilloscope PXIE-5162 to measure the Na-22 spectrum with Canberra's NaI(TI) photomultiplier tube. I notice that although the trigger level is always kept constant at 0.1V, there are still ...
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Latching interval timer with positive trigger
Can I create a latching interval timer circuit with a 555 chip using a positive trigger (which is not pulsed but remains high during the timing interval and afterwards) without retriggering the timer? ...
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How do I get a stable trigger on a digital Hantek oscilloscope?
I'm not a super-expert of oscilloscopes but I used several Tektronix (both analog and digital.)
I have a Hantek DSO4254C and I'm not able to get it to trigger on a sine wave coming from my board. The ...
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TRIAC self triggering. How can I improve my circuit?
I have designed a circuit board for my Arduino controlled dishwasher, using the following circuit taken from the MOC3043 datasheet. I have used a BTA 16-600BW snubberless TRIAC with a 100 ohms and 10 ...
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Monostable (eg CD4538 channel) connecting rise and fall inputs together to generate pulse from rise or fall
I would like to use one channel of a dual monostable (CD4538) to generate a pulse from either a rise or fall single trigger input feed.
If I connect rise and fall trigger inputs together
(or use a ...
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Confusion about edge/level triggering interrupt
I have read this answer.
My understanding is, there are actually 2 lines logically:
clock/gating line
event/interrupt line
And the clock/gating line can make the circuit take event input at an ...
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Read parallel data that is valid in falling edge clock NUCLEO-H743ZI2
I have an external ADC with 2 parallel output pins. Each is 1 bit (2 bits total), with clk_out pin.
I am trying to read the parallel pins using a NUCLEO-H743ZI2 (480 Mhz). I followed the AN4666 ...
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Are false positives from (advanced) IR proximity sensors normal? - VCNL36826S
I am working on project where I am using an IR proximity sensor from Vishay - VCNL36826S.
This sensor is observed to give false positives randomly. As I am still trying to catch this rare event, the ...
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Switch Drive High-power MOSFET Trigger Module not working
Hi! I am trying to get 24V output at 5kHz frequency (square wave) from a microcontroller at the 5V-5kHz output. I am using High-power MOSFET Trigger Switch Drive Module. I connected 0V to DC- and 24V ...
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Why TRIAC is not triggering?
I'm trying to trigger a TRIAC BTA16-800 using an MCO3021 optocoupler. I have a two-channel power supply, in one of them I'm pulsing the optocoupler at 120 Hz and the other channel is configured as a ...
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To trigger ON & OFF of an emergency light with external signal
I need to trigger ON an emergency lamp with a (1st signal) signal, and the lamp will be lighted up until the next (2nd signal) signal is received then the emergency lamp will go OFF. How could I do ...
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Adding a buzzer to an existing LED
I have a set top box. It has a 3 mm green LED (on the front panel) that lights up when I connect the dish coax cable (signal LED).
I measured the voltage across the LED. It has 0 V when the dish cable ...
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CD4069 toggle switch
How to connect the trigger out instead of the switch? Like a toggle switch. The first trigger out activates the relay and remains ON infinity, the second trigger out deactivates the relay and remains ...
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Confusion with trigger controlled analogue output of a DAQ board
I came across this article, and regarding the DAQ trigger and analogue output part I'm confused.
If I don't get it wrong the DAQ generates particular analogue voltage levels for X and Y of the galvo-...
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How to trigger an 8 channel relay module with an air coil and moving magnet
I just bought this 8 channel relay module on Aliexpress, and I'd like to try to trigger it using an air coil and a moving magnet, but I'm unsure how to connect the coil to the trigger and collect the ...
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At what value should I choose the MOSFET resistors for the MOSFET triggered by the MCU?
I have added a picture of my circuit.
Vcc = 5 V and Rled = appr. 600 Ω.
So, I_Rled_current = 6-7 mA.
The MCU is an ATmega328p.
MCU pd1 and pd2 are logical high and logical low.
What should the values ...
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How to stabilize this CV triggered toggle (555 timer latching switch) when fed with two gates?
I created the prototype for a modular synthesizer module. The project goal is an AND gate that is fed with two control voltage inputs (A and B with an Vpp around 5V). There will be two outputs: the ...
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Advancing the clock of a CMOS IC with multiple signals
What would be the best way to advance the clock of a CMOS OC from multiple signals?
In my situation the "upper" signal puts the system in working and the system itself generate the next ...
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Level shifting a non-periodic signal
I have an RFID reader that sends a high 5V logic level when it is triggered (RFID tag is seen by the antenna).
I want to then use this 5V output to trigger an ESP32 to turn on an LED and also send an ...
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Controlling a FESTO solenoid valve with Raspberry Pi - Trigger Issues
I'm currently working on a project for university, where I want to control a Festo solenoid valve (MHJ10, https://www.festo.com/cat/en-us_us/data/doc_enus/PDF/US/MHJ_ENUS.PDF) via a Raspberry Pi GPIO. ...
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Sending / Receiving trigger signal wirelessly or through Ethernet
Simple engineer with no background in electronics/electrical engineering here.
I have 2 instruments (emitter and detector) that are synchronized by a Trigger signal. This signal is sent via BNC cable.
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One-Shot circuit has problems with slow voltage ramps
I'm using this circuit:
simulate this circuit – Schematic created using CircuitLab
The circuit is powered by "24V" , "24V ENABLE" is the trigger. The circuit should act like ...
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555 timer won't trigger monostable mode unless I add a switch between R12 and ground?
I have this setup which is a part of a bigger circuit to control motors.
This is supposed to be a timer in monostable mode with about a minute of hi output when triggered.
The lines going down are to ...
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How can i turn a DPST button in to a DPDT?
How can i turn a DPST button in to a DPDT?
I've replaced all the stock rocker switches in UTV, got all 14 of them done except for one all to Push Buttons. The push buttons are SPDT, "on/on" ...
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Moving AI IP into new FPGA. Is the trigger for reading ROM an address change?
I'm confused about the trigger for reading ROM.
I want to read one of 4 k bytes but it appears the clock is free running and may be continuing to read the same address while I'm processing the byte I ...
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Analog Oscilloscope Flickering Signal Problem
I am using BK Precision 2125C Dual Trace Oscilloscope (30 MHz), which is analog. I'm trying to observe signal generated by the output of microprocessor. I'm seeing flickering signal (quickly moves ...
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What kind of electronic component is this?
I am trying to repair the flash of a P900 camera, since it gives a burning smell after being used.
After disassembling the flash unit, I came across this part for which I need some professional eyes ...
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Oscilloscope: trigger and multiple periods of the signal
I am trying to understands the basics of an analog oscilloscope trigger. As stated here,
Instead of collecting a single snapshot of the input signal, an
oscilloscope repeatedly updates the display ...
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Low latency wireless trigger
I am working on a project consisting of a sensor and receiver connected via Bluetooth 5.2. When the sensor receives a start signal from the receiver, it will begin sampling readings at ~10kHz and ...
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switching off 555 timer with trigger button
I am new to working on 555 timer. I am running it in monostable mode. I am triggering it using a button on trigger pin. It works just fine. What I want is the LED connected to the out pin 3 to switch ...
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Triggering a relay with S/PDIF?
I would like to use my audio interface to trigger a mains relay, as soon as the audio interface is turned on. Unfortunately, the interface turns on electronically, as opposed to using a mechanical ...
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Reset and trigger 555 timer with one push button
I want to turn on a LED with a single push button. When the button is pressed, the LED has to be turned on for an X amount of time. But what I also want, is to turn of the LED with the same push ...
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Rising Edge vs Falling Edge D Flip-Flops
Is there any difference between a rising edge and a falling edge triggered D flip flop? For example, a falling edge flip flop will be faster or if there will be any change in result.
Is it correct for ...
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Can a feed wire also be used as a relay trigger?
Can I use a low voltage wire (10.5 V) as a supply AND trigger With a single pole double throw relay? Is there a solid state option available?
I need a way to switch power back and fourth to LED lights ...
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Is this implementation of activating of boom-arm vehicle barrier correct?
Previous Post
From my previous, I asked about how the trig pin works on the boom-arm vehicle barrier. I would like to know if the below circuit is correct?
This circuit assumes the boom barrier opens ...
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Understanding of how the trigger connector works on a boom-arm vehicle barrier
I would like to know how the trigger (TRG) pin works on the boom-arm vehicle barrier. From my understanding looking at the circuit below for an external radio receiver, when the trg pin is grounded is ...
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STM32 - Configure Output Compare Registers on the Fly
since this is my first, feel free to give newbie a feedback :)
I have a following setup with my STM32 Nucleo (simplified, ignore the HW behind):
a) one input signal acquisition (Square wave, consider ...
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Why does Basler GPIO need to have an external powersource + resistor to its GPIO output
Background
We are usingzBasler camera with an output trigger. The camera output gpio is 3....
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A circuit that converts contiuous pulse signal to a stable level signal, and reverse if pulse not present
I have a 12V 3-pin computer fan that has a tachometer signal output: when the fan is spinning normally, the tacho wire is either floated or shorted to ground periodically. If you connect a pull-up ...
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Switch that triggers at 2V
I have a piece of electronics that acts as a event sensor and its trigger voltage starts around 3.3V. Lets say that I want to little bit hack this device and hook it up to a button that is on other ...
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Triggering BT139 triac with MOC3063 opto triac
First time poster having some problems with triggering triacs. I'm well aware of the dangers of working with mains voltage and I'm very careful.
I'm using one BT139-800 triac to switch a 35W single-...
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how to solve the phase shift of a ne555 timer
Why is the first pulse wave is not the same as the rest of the wave in this 555 timer?
Is there any way to remove the wave before 2 ms or is there anyway to make it same as the rest in the graph.
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How to convert any periodic signal to a square wave signal using the Schmitt Trigger?
I had to make a kind of frequency meter, and what made me stuck was the signal formatting. I couldn’t build a circuit containing the Schmitt Trigger, which will allow me to convert any periodic signal ...
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Converting a NPN Circuit to PNP
I've got an exact circuit diagram of the circuit in NPN, but I need to convert it to PNP. Could someone help, please?
I've got a 2N2907 with me right now and I want to make my High Level trigger into ...
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Weak signal via pull-up resistor?
I am trying to trigger a camera from another primary camera. The circuit diagram provided is as follows:
The signal to the input is supposed to be a positive square wave. So 0 V and a peak to peak of ...
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Blinking an LED once when a slide pot is pulled to ~zero ohms
I am developing a little circuit to control a servo linear actuator that is used to control fine injection onto a microscopy set-up. I am using a 555 circuit (see below) to generate the PPM signal ...
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Timed one-shot circuit to drive laser module
I'm trying to adapt my Match Guns MGH1 (Air pistol with electronic trigger) to use trigger a laser when shooting. Currently the trigger circuit is driving a solenoid. The circuit board seems to have ...
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Share ground between 12 V and 5 V
I am working on this small project getting a relay to turn on/off the amp. when it gets a 12 V trigger from a netstreamer.
The relay is powered from 5 V USB 230 V adapter.
Question: should I connect ...
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