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Bright/dark LED triggering off PS3Eye VSYNC for eye tracking.
This circuit describes one way of tapping the VSYNC to toggle an LED on/off on alternating frames.
I heard a strange noise when I used it the last time. Something was sliding back and forth in there. Still I used it last time. After removing the back cover it turned out that 2 metal screws were completely loose.
As you can see in the photo, they could have shorted out quite a lot of things in there. Call me stupid.
I've etched a PCB before, but this is the first time it actually came out more or less the way I wanted it. I used the toner transfer method, after designing the circuit with Eagle. Still have to drill the holes, but I'm pleased so far!
Parallax Propeller in DIP form factor with support components: programming header, crystal, reset, 3.3V regulator.
Product image of components from the Jennic range - www.sequoia.co.uk/components/manufacturer_list.php?m=12&a...
Jennic is a market leader in ZigBee, 6LoWPAN, IEEE802.15.4 wireless microcontrollers, modules and evaluation kits.
Velleman PMK 111 INTERVAL TIMER
A member of the University of Oregon explains some of the properties of electronics a the University Science Day exhibit at the Science Factory in Eugene, Oregon
Product image of components from the Jennic range - www.sequoia.co.uk/components/manufacturer_list.php?m=12&a...
Jennic is a market leader in ZigBee, 6LoWPAN, IEEE802.15.4 wireless microcontrollers, modules and evaluation kits.
Some shots from the electronics flea market. I took these around 11 when I was done browsing, so a lot of vendors had already left or started packing up.
Computers, printers, keyboards, scanners, copiers, cell phones and televisions (no large wooden console TVs, please!) will be collected. A $20 fee for televisions and $15 for computer monitors applies, but LED or LCD monitors and TVs are free.
Making sure that the monobox circuit and speaker work well inside the box. Box needs painting/decorating properly still. Also have to fix power, audio and switch in place.
The DAC chip itself all soldered. This surface-mount stuff is REALLY TINY. You're looking at a chip about a centimetre in length.
First electrical engineering laboratory devoted to Electronics. Situated ground floor north side of old engineering building under the blue room lecture theatre. Later converted to basement collection of the engineering library. Don Hewitt is the student at the Cossor double beam oscilloscope!
Building version 2, six ICs down and tested. Including LM393 dual comparator and the two TS12A4514 analog switches from version 1, used to reset the integrators.
There is also now a 5V rail (on left) for powering the analog switches and the CMOS chips to be added. There won't be enough room on this breadboard for everything.
Update: This version has already been abandoned, because I forgot to include the multiplexers that "freeze" the integrators when required. Also, it's likely I will begin to use the Yamaha Y3014B floating point DAC for the integrator slope (coefficient) voltages, because they have important extra precision for small magnitudes.