Getting started

[Kotuu3]

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! :)

[jimwhitelaw]

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]

Simply use Nano, HC-05 and some guidance from instructable website (google it) and it should work.