On Tue, 27 Nov 2012 08:34:23 -0700, Jim Thompson
>On Tue, 27 Nov 2012 00:41:42 -0800, josephkk
>>On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <je...@cruzio.com
>>>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak
>>>>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, so probably I can set up another PIC through the USART and communicate with the ELM.
>>>>And possibly use a 2x16 char LCD display to show the parameters. Brill !!!
>>>This forum and article might be of some help.
>>>"free OBD2 software with MPG calc"
>>>Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with.
>>>The plan was to leave it plugged into my vehicle OBD2 connector and
>>>have it communicate performance numbers via BT to my Droid X phone
>>>while driving. The plan was ruined when I found myself with a dead
>>>car battery the next morning. It seems that the Mini ELM327 does not
>>>turn off when the ignition key is off, and continues to draw power.
>>>Actually, it drew enough power to get hot enough to partially melt the
>>>blue plastic case. A quick survey of other such devices indicates
>>>similar problems. I had to crack the case to install an on-off
>>There is something weird about this, a PIC eating enough power to flatten
>>a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the
>>case??? Where in hell is all that energy going?
>And someone with no knowledge that vehicles DO have "accessory" power
>that goes off when the ignition switch is off :-)
> ...Jim Thompson
This is on the OBD2 connector, which does not depend on the ignition
switch position. Please pay attention properly.