On Mon, 2005-03-14 at 16:51 +0000, Ralph Corderoy wrote: [...]
Not my strong-point either, but here's another circuit diagram from the Hardware Recycling Initiative to throw into the pot. 0.1mF.
http://hri.sourceforge.net/tools/#uart
I eventually wired it up with 22µF; unfortunately I made a wiring error the first time I powered it up, and I think I've fried the MAX232. It's registering pretty much open circuit across GND and Vcc, which I suspect is wrong... anyone know how to diagnose one?
(The wiring error was to connect GND to Vcc --- I plugged it into the wrong rail on the breadboard. I'm a little suprised that this would kill the chip, but there you go. I'll have to get another one and try again.)
BTW, I'm using a USB plug as my power source. Pins 1 and 4 provide a nice handy 5V supply. I'm not sure yet whether you can use the E2's own USB socket; it depends whether the socket's powered up by default or not, so for the time being I'm using my PC, making sure all the various grounds are tied together.
Sigh.