Author Topic: Help with single shot pulse using a waveform generator.  (Read 1487 times)

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Offline Andy JonesTopic starter

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Help with single shot pulse using a waveform generator.
« on: January 25, 2018, 03:30:35 pm »
Hi All, I have to provide a single shot 5v .2A 30ms square wave to test a squib circuit. I think it can be done easily with a monostable 555 timer circuit but I have a reasonable budget and I would also like to acquire a waveform generator to increase my future capability.

Does anyone have experience using generators in a single shot pulse mode? before I buy one I'd like to know if it will give me just one pulse with a long gap (around a minute to make any adjustments to test kit) I would prefer to acquire something that can be programmed simply from the front panel or without too much software involved.

I emailed a couple of manufacturers and one said it can’t be done and another said go read the manual, which wasn’t helpful.  Just wondered if this is a common function of modern arbitrary waveform generators?
« Last Edit: January 25, 2018, 03:35:40 pm by Andy Jones »
 

Offline danadak

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Re: Help with single shot pulse using a waveform generator.
« Reply #1 on: January 26, 2018, 08:32:16 pm »
Several ways to tackle this -

1) Logic pattern generators do have single shot capabilty, some logic
analyzers have pattern generation capability as well.

2) Do it with a PSOC, see attached screen shot of a solution. You can
use PSOC 5LP high end part, board is $ 10, or low end PSOC 4, board
is $25, arduino footprint. Note in this instance its all HW, only takes
one line of code, you have to issue a PWM1_Start(); command.

Button pushes during the cycle do not retrigger until end of cycle.
PWM is edge triggered so I did not bother debouncing the button,
otherwise I would have used the debouncer component.


Regards, Dana.
« Last Edit: January 26, 2018, 08:49:52 pm by danadak »
Love Cypress PSOC, ATTiny, Bit Slice, OpAmps, Oscilloscopes, and Analog Gurus like Pease, Miller, Widlar, Dobkin, obsessed with being an engineer
 
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Offline danadak

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Re: Help with single shot pulse using a waveform generator.
« Reply #2 on: January 26, 2018, 09:01:54 pm »
This is $ 25 board used, low end part.



The board with high end part, much more capability, $ 10 -




Regards, Dana.
Love Cypress PSOC, ATTiny, Bit Slice, OpAmps, Oscilloscopes, and Analog Gurus like Pease, Miller, Widlar, Dobkin, obsessed with being an engineer
 
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Offline Damianos

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Re: Help with single shot pulse using a waveform generator.
« Reply #3 on: January 27, 2018, 12:36:24 am »
Any function generator that supports burst mode can do this, among many other things.
 
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