ODB II Car interface

The assumption is that a sub £10 device is being used from eBay.

Connect using telnet. Use PuTTy rather than windows telnet and turn off local echo and force a CR when a LF is received to avoid the characters repeating on the screen and also overwriting themselves.

• Plug the OBD II adater in and look for it's wifi SSID.
• Connect using telnet to 192.168.0.10 port 35000

Then at the prompt enter the following commands (each will respond with 'OK') :

• at h1
• at d1
• at sh 79b
• at fc sh 79b
• at fc sd 30 00 20

• at fc sm 1

• atz
• at sp6
• at h1
• at sh 761
• at fc sh 761
• at fc sd 30 00 00
• at fc sm 1

To display diagnostic information then type :

• 21 02

This will allow the battery health to be interogated amongst other things, but most importantly it will allow the vehicle charger in the garage to talk to the car over wifi to know how much range it has left. This can then be coupled with predicted mileage to work out how much charge is strictly required if there is no overall surplus solar production predicted.

With my current car and its 25 mile electric range this is less of an issue as I'll charge it from solar whenever I get the chance, but with a newer car with far greater potential range it makes a lot of sense.