[McHUG] Zipit

[Steve Beckman]

Hi Rich;

2 GB is good for the Zipit. I have not played with the serial port (yet).

73; Steve, N3SB

------Original Message------
From: N3III Rich Mitchell
Sender: mchug-bounces at mailman.qth.net
To: McHUG Reflector
ReplyTo: MicroController Ham User Group - Physical Computing for Ham Radio
Sent: Mar 15, 2010 10:56 AM
Subject: [McHUG] Zipit

Gentlemen,

I have placed my order for a Zipit Z2 from Amazon.  I also ordered the Kingston 2 GB microSD with the miniSD and SD adapters.  Question:  is the 2 gig the right size?  I noticed that there are also 4 and 8 gig SDs that have been ordered with the Zipit.  Anyway, when that gets here I'll be ready for a Linux Loading session.  Is the MAX233A hack the way to go for a serial port?  It would be great to communicate with the Arduino.
http://aibohack.com/zipit/serial.htm

In my interest in old pocket watches I notice that they usually have a going train that beats at 18000 bph, 16200 bph or 14400 bph.  These of coarse translate to 5, 4.5 and 4 beats per second.  If you get the watch beating at those rates (depending on which train it has) your watch will be acurately set.  Wouldn't it be great if we had a tool running at, say, 16 million cylces per second to measure the ticking of a pocket watch for a minute and tell use exactly what the bph was?  Hello McWUG.

Anyway to come up with a shield to listen to pocket watches I found a nice, cheap circuit for inputing sound to a PICAXE.  
http://www.rev-ed.co.uk/docs/picaxe_sound.pdf

Being British their transistors being used are the BC548B and BC558B, which I understand are general purpose NPN and PNP transistors.  Anyone know offhand what would be good equivalents to use this side of the pond?  2N3904 and 2N3906?

Rich
--
McHUG - Physical Computing ;) 
MicroController Ham User Group
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