http://groups.yahoo.com/group/Electronics_101/ Electronics Learning Group Mon, 23 Nov 2009 14:09:52 GMT jong kung http://groups.yahoo.com/group/Electronics_101/message/57511 http://groups.yahoo.com/group/Electronics_101/message/57511 ebiz_59 (or is it ChuckM), ... The temp reading (using a diode, transistor, or even dedicated temp sensor) is trivial.  Converting it to digital is part of Mon, 23 Nov 2009 13:56:56 GMT jong kung http://groups.yahoo.com/group/Electronics_101/message/57510 http://groups.yahoo.com/group/Electronics_101/message/57510 Marc, ... Caps are not like batteries (which takes a while to discharge).  When caps are shorted (or grounded), they discharge immediately (or in Mon, 23 Nov 2009 13:51:08 GMT Sheldon Dedek http://groups.yahoo.com/group/Electronics_101/message/57509 http://groups.yahoo.com/group/Electronics_101/message/57509 I wouldn't think that it would be too difficult. It appears that all that is happening is that a known current is being passed through each sense element. Mon, 23 Nov 2009 12:57:28 GMT Ross McKenzie http://groups.yahoo.com/group/Electronics_101/message/57508 http://groups.yahoo.com/group/Electronics_101/message/57508 ... Marc, You would set the pin to be an output, then set it to be a zero and thus discharge the cap (allow a few milliseconds), then set the pin to be an Mon, 23 Nov 2009 09:53:22 GMT Marc R.J. Brevoort http://groups.yahoo.com/group/Electronics_101/message/57507 http://groups.yahoo.com/group/Electronics_101/message/57507 ... Good one, that saves a pin. How would I tell the capacitor is fully discharged, though? With the transistor-shorting version, the charge will drop to zero Mon, 23 Nov 2009 04:31:51 GMT Scott Burris http://groups.yahoo.com/group/Electronics_101/message/57506 http://groups.yahoo.com/group/Electronics_101/message/57506 Following up my own email, how about this scope: http://jyetech.com/en/default.html 5Mbit/sec samples with 1M analog bandwidth Sparkfun has them in kit form Mon, 23 Nov 2009 03:33:08 GMT ebiz_59 http://groups.yahoo.com/group/Electronics_101/message/57505 http://groups.yahoo.com/group/Electronics_101/message/57505 I am a farm kid who has cylindrical steel bins that have temperature cables hanging in them. The system I use is Opi One, and the company says the cables Mon, 23 Nov 2009 03:04:58 GMT rtstofer http://groups.yahoo.com/group/Electronics_101/message/57504 http://groups.yahoo.com/group/Electronics_101/message/57504 More on the same idea of RC circuit: http://www.emesystems.com/BS2rct.htm With the 2313, you have an analog comparator so you can do a much more precise job Mon, 23 Nov 2009 02:42:21 GMT John Popelish http://groups.yahoo.com/group/Electronics_101/message/57503 http://groups.yahoo.com/group/Electronics_101/message/57503 ... The input pin that detected the capacitor charged to a specified voltage (via the comparator option), can be switched to output mode to discharge the Mon, 23 Nov 2009 01:08:45 GMT rtstofer http://groups.yahoo.com/group/Electronics_101/message/57502 http://groups.yahoo.com/group/Electronics_101/message/57502 ... The Basic Stamp doesn't have A2D either. They do exactly the RC charging thing. They fully discharge the pin by driving it low with the output function Mon, 23 Nov 2009 00:59:11 GMT Herbert E. Plett http://groups.yahoo.com/group/Electronics_101/message/57501 http://groups.yahoo.com/group/Electronics_101/message/57501 sure isn't it reasonable to just get a commercial charger? Sun, 22 Nov 2009 21:51:16 GMT Marc R.J. Brevoort http://groups.yahoo.com/group/Electronics_101/message/57500 http://groups.yahoo.com/group/Electronics_101/message/57500 Hi, Just out of curiousity whether this is possible (a challenge!). I've got a handful of ATtiny2313 microcontrollers laying around. I also have a passive Sun, 22 Nov 2009 17:17:19 GMT Howard Hansen http://groups.yahoo.com/group/Electronics_101/message/57499 http://groups.yahoo.com/group/Electronics_101/message/57499 Look for a motor run capacitor. Expect to pay US$10.00 or more for a motor run capacitor. Howard Sun, 22 Nov 2009 15:24:53 GMT rtstofer http://groups.yahoo.com/group/Electronics_101/message/57498 http://groups.yahoo.com/group/Electronics_101/message/57498 ... You never mentioned what type of batteries. If you expect the batteries to survive, there are very specific charging current/voltage profiles that must be Sun, 22 Nov 2009 08:43:32 GMT Sanmeet H http://groups.yahoo.com/group/Electronics_101/message/57497 http://groups.yahoo.com/group/Electronics_101/message/57497 What type of caps would be most suitable? x-cap/y-cap/normal electrolytic/film/other ________________________________ From: stevie_blunder_52