Character Gibberish

[wourmman]

Recently completed OBDuino using NKC Freeduino and NKC HD44780. Code loaded just fine (after disconnecting Tx and Rx from Freeduino). All of the characters are gibberish. Help??

[dcb]

usually a wiring problem or a bad lcd. When it happens to us we hold a good lcd in parallel and bounce the power, if it looks ok on the good lcd an not the one in question, then it is a bad lcd problem. Might not be an option for you, so double check wiring.

[wourmman]

I checked my Freeduino and HC44780 LCD with a "hello world" sketch; worked fine. So I'm back to trying to get the OBDuino to work, but I can only get "alpha" "x-bar" and solid block characters (although I did get a ISO9141 or something like that after one reset).

Would very much appreciate any further recommendations...

[wourmman]

Have double-checked connections a number of times, still no luck w/ OBDuino. Have only Freeduino and an OLED LCD (HD-44780-conforming) hooked up (no transistor nor ISO bus transceiver hooked up).

What should I be checking: software version? Do I need hooked up all the way to the car OBD port?

I'm at a loss -- help please!!