Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Any interest in developing an open source fuel economy gauge/computer?

dcb · 03-28-2008, 10:41 AM

I have a confession, I ordered both a serial and a USB, and the little $7 rs232 card for the usb model: http://www.nkcelectronics.com/rs232-...converter.html

I want the $17 one to work because that brings the mpg gauge cost down noticibly and has better reuse potential with older devices without additional costs.

I got the usb one because, well, that's what my blackberry uses. I don't know why I bought the rs232 board though

Re Power Supply voltage, the 7805 is rated for like 35 volts, so it can handle it electrically speaking. Mine didn't feel warm at all at 15 volts after being on for half an hour, but it was only blinking an LED. Dunno, I'd hate to be scared into buying unnecessary components on the one hand, and 7805s are pretty cheap if it does quit.

03-28-2008, 10:41 AM	#121 (permalink)
dcb needs more cowbell Join Date: Feb 2008 Location: ÿ Posts: 5,038 pimp mobile - '81 suzuki gs 250 t 90 day: 96.29 mpg (US) schnitzel - '01 Volkswagen Golf TDI 90 day: 53.56 mpg (US) Thanks: 158 Thanked 269 Times in 212 Posts	I have a confession, I ordered both a serial and a USB, and the little $7 rs232 card for the usb model: http://www.nkcelectronics.com/rs232-...converter.html I want the $17 one to work because that brings the mpg gauge cost down noticibly and has better reuse potential with older devices without additional costs. I got the usb one because, well, that's what my blackberry uses. I don't know why I bought the rs232 board though Re Power Supply voltage, the 7805 is rated for like 35 volts, so it can handle it electrically speaking. Mine didn't feel warm at all at 15 volts after being on for half an hour, but it was only blinking an LED. Dunno, I'd hate to be scared into buying unnecessary components on the one hand, and 7805s are pretty cheap if it does quit. __________________ WINDMILLS DO NOT WORK THAT WAY!!! Last edited by dcb; 03-28-2008 at 10:52 AM..