Telematics General

powering via obdII adapter

userHead pietro 2013-12-03 17:16:12 4069 Views2 Replies
I just received logger kit #1 with arduino nano.
I discovered that if I power arduino via the OBDII adapter the lcd does not work.
LCD works if I power arduino nano via USB.
I think that the reason is the following (from [url=][/url]):
"The FTDI FT232RL chip on the Nano is only powered if the board is being powered over USB. As a result, when running on external (non-USB) power, the 3.3V output (which is supplied by the FTDI chip) is not available and the RX and TX LEDs will flicker if digital pins 0 or 1 are high".

2013-12-10 17:11:35 This way everything works. Thank you. userHeadPic pietro
2013-12-08 00:48:46 I did it: I get 3.3 V when arduino is powered via USB, 0 V if arduino is powered at a 5V pin.
I think the solution is to use an Arduino uno, or a regulator.
userHeadPic pietro