Re: Need circuit to produce 3 modes of audible confirmation


"Jason S" <jst3712@xxxxxxxxxxxxxx> schreef in bericht
news:439972f7_1@xxxxxxxxxxxxxxxxxxxxxx
>I need to make a circuit that will produce either one, two or three short
>consecutive beeps depending on the input signal it recieves.
> For example:
>
> Input 1 = One beep (could mean 'ON').
> Input 2 = Two beeps (could mean 'OFF').
> Input 3 = Three beeps (could mean 'ERROR')..
>
> This is just an example. The 3rd one is not critical, but would be nice.
>
> I want to be able to add it to practically any circuit which will provide
> audible confirmation of the circuit's current operation. I was thinking
> of using a PIC to do this, but is last resort (as I know absolutely
> nothing about them).
>
> Has anyone got any suggestions?
>
> Thanks.
>


A PIC, even the smallest one is the most simple solution... once you can
program it and program it. That's to say you need the skills and the
equipment. If you like to make more of this type of circuits the investment
wil sure pay off. Otherwise, a bunch of 555s may do the job as well.

- One astable (1) for the beep timing (let's say 0.4s on and 0.4s off once
enabled)
- One monostable (1). Triggered by 'ON', enabling the astable (1) for 0.6s.
- One monostable (2). Triggered by 'OFF', enabling the astable (1) for 1.4s.
- One monostable (3). Triggered by 'ERROR', enabling the astable (1) for
2.2s.
- One astable (2) optional to produce a 1kHz beebfrequency once enabled by
astable (1).

The most straightforward way to control astable(1) by the three monostables
is a 3-input OR-gate (or NAND).

petrus bitbyter





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