Recent content by Iain_C

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    Using a PICAXE as a UART for a simple computer?

    Hi all, I'm having a lot of fun with a homebrew TTL CPU. However, I'm not having fun using a UART to give it serial comms. My homebrew architecture is extremely simple and although I'm comfortable with driving UARTS having built a Z80 machine, the usual suspects (8250, 16550, SCC2691) are out...
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    Towards a nice keyboard controller program

    Hi all, It's been a while since I posted here; but once again my electronics experiments have led me to the PICAXE :) I'm building a Z80-based computer, and I'm using a 14M2 as a PS/2 keyboard controller to feed ASCII to an SCC2691 UART; for now I'm debugging over the programming link...
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    Simple PICAXE 08 CD robot + BEAM-inspired PICAXE walkers

    Hi all, Been a while since I posted here; just wanted to say that I've put up photos and brief write-ups of two PICAXE robotics projects on my website. One is a simple 08-based robot with differential steering, built on a couple of CDs sandwiched together. The other is a...
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    Serial optoisolation

    Serial optoisolation / galvanic isolation Hi all, I'm basing this on Wilf's UIO circuit, but I want a bidirectional opto-isolated serial link. Should the below work, or have I done SERIN incorrectly? Best, I.
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    Simplest EEG

    Hi all, My PICAXE experiments (and you lot) are helping me go from strength to strength with my electronics knowledge. I'd very much like to build a minimal PICAXE "simplest EEG" for neurofeedback purposes but I'm a bit out of my depth on this one. I think that an EEG needs a preamp stage with...
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    Binaural signal generation

    Hi all, I'm interested in making a Picaxe-based mind machine, to provide photic stimulation and binaural signal generation. The hardware side's certainly easy; an output for LEDs on googles, and an output for each headphone with an RC filter. The question is how to get the three frequencies I...
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    Instruction timings, with a view to video generation

    Hi all, I'm a new PICAXE user but familiar with uCs in general. I'm trying to do PAL composite video signal generation in software on an 18X. I think it should be doable even at 4Mhz, albeit with low horizontal resolution. But to get it working I'm going to need per-cycle accuracy. Is there a...
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