Comments for justDIY Project Log

Comment on Pentax IR Interval Timer by justDIY

justDIY — Sun, 01 Jan 2012 17:54:03 +0000

you could disassemble your IR remote and look at how the button works, if one side of the button connects to ground or the positive supply, then you can substitute the button with a transistor, and use a simple timer circuit or microcontroller to trigger it. in my pentax remote, the button connected two pins on the chip that controlled the remote, and employed a digital handshake, rather than a simple pull up / pull down. obviously pentax chose to to this to make it hard to hack the remote physically. they should have made the IR signal more complex, it was easy to reverse engineer.

Comment on Pentax IR Interval Timer by Don Pullum

Don Pullum — Sun, 01 Jan 2012 15:22:34 +0000

I have a Sony a-230 and a-330 neither of which will take a wired “timer”. Both use a simple IR remote focus and fire remotes they only cost about $2.

The off the shelf interval timer unit is an easy way to go. I purchased a timer for about $20 on E-Bay. Oops only plugs in on other Sony models, but it has focus and fire outputs via a (3 contact) stereo plug.

Would it be possible to fire an IR with that interval timer output via a simple circuit? If so, can someone email me a reference. Thank you.

Comment on Audio Matrix Switch by justDIY

justDIY — Sat, 26 Nov 2011 22:52:27 +0000

This was a project that was never built, more of a mental exercise. I don’t know if it would have actually worked.

1. Control was going to be provided by a separate daughter board and microcontroller, or the parallel port of a PC. The interface is similar to SPI, using simple serial shift registers to interface with the switch chips.

2. Jacks never came up, I provided simple pin-header type connectors and planned to use simple shielded mic cable to connect the board to either 3.5mm or RCA style jacks.

3. The switch chips are analog, one design aspect I never investigated was how well the switches would handle an AC voltage running off a single supply.

Hope this info helps you out, thanks for visiting!
justDIY

Comment on Audio Matrix Switch by mrbirk

mrbirk — Tue, 22 Nov 2011 21:11:17 +0000

This is some small scaled kind of what I’m planning. But, cause I’m not that expierenced with digital or chip based circuits, so I do have some questions:

1. How do you controll your matrix switch? Do you use some kind of computer based software?

2. What kind of jacks do you use for I/O, controlling and power supplie?

3. Are the audio I/O analog or digital? If they are digital what DA converter do you use?

Thanks for the Information, I’m so glad I finally found some usefull ideas!

Comment on Bi-directional LEDs II by Electro

Electro — Tue, 01 Nov 2011 14:53:48 +0000

How did you draw on visual basic?