jimwhitelaw
commented
2 weeks ago The vast majority of ELM327 devices are BT, BLE, or Wifi now. Many professional scanner units costing thousands of $$ also use wireless connections now, so I think you can be confident that it will be reliable enough. If you really want to use a wired connection, you can get ELM327 USB adapters that have a std USB A plug. You'll probably have to do some custom wiring and use something like an FTDI adapter board to connect it to your ESP8266, but that could potentially work.
MFAISALREHMAN
Hi!
I’ve been interested in this project for quite some time, and I still need help, as I can’t find good information on how to hardwire everything together. I want to buy an ELM327 (transparent blue plug) and an OLED display, which I plan to use with an ESP8266. From what I’ve found online, I can use the ESP for this, but my biggest concern is the wiring. I don’t want to use Bluetooth for it. Can I simply desolder the Bluetooth module from the plug and solder the RX/TX directly to the ESP (or do I not need to desolder the Bluetooth at all)? Will it just work? I’d prefer not to spend money and time (waiting for shipping; buying it locally would cost twice as much) if I can get precise information from you guys.
EDIT: i PREFER to hardwire, i also have bt module (HC-05) that i can use, but will it be "crisp" like hardwire would? I want to add few simple readings like, engine temp, coolant temp and i'm just wondering how can i execute this project without additional problems :)
Thanks! :)