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Subject: Re: PIC12C508A-based remote - update

Re: PIC12C508A-based remote - update

From: Steve Russell <>
Date: Sat, 21 Dec 2002 21:52:20 -0000

I can now change the baud rate on the fly, and you can see Rockbox start to
reject the commands as the baud rate deviates too much (+ or -) from the

My measurements of current consumption bear out my calculations. Even with a
standard '508A, the battery life (2xCR2032 cells) should be about 2 years.
If a low-power (LC) device is used, a single CR2032 should last a similar

My next step is to design a PCB to go in a small box.


"Steve Russell" <> wrote in message
> Well, I finally found some time to work on the remote control I
> mentioned some time ago. I have the unit passing all 6 commands to my
> AJBR20 and it responds as expected to single button presses. Thanks are
> due to Tjerk Schuringa, creator of the original REMOCON clone, and the
> authors of Rockbox for providing most of the information necessary to
> implement the device.
> I've got the hooks in place to modify the baud rate to compensate for
> the wider-than-needed tolerance of the PIC's internal oscillator, but
> haven't yet implemented a mechanism for the user to change it. That
> said, my development '508A works fine with the nominal oscillator
> value.
> According to my calculations, a couple of coin cells should last well
> over a year, maybe two, but I haven't measured the current consumption
> yet, that's something I'll check shortly
> When I'm happy with the design, I'll make it available for others to
> use.
> I do have a couple of questions:
> 1. I'm using a repeat rate (when a button is held depressed), of about
> 144ms. The VolUp and VolDn buttons work well with this setting, but the
> Next and Prev buttons skip many songs, rather than switching to FF or
> REW as do the buttons on the unit itself. This is true of Rockbox 1.4
> and Archos 1.27d code. Would someone who has the Archos remote tell me
> what it does when the Next and Prev keys are held down?
> 2. Are there any other functions made available using the Archos
> remote?
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Received on 2002-12-21

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