What is it? As the name suggests, it's a transmitter that will open the charge port of a Model S.
When I received my EU spec model S, i charged a few times with the cable Tesla supplies with the car. The button to open the Charge port door, really is a nice feature. As there is no such thing on a standard Type 2 charge cable, i now have to open the car door, touch the battery icon, and select open charge port. Not very convenient.
Therefore i wanted to make my own transmitter that opens the chargeport.
Credits to Banahogg who documented his attempts to analyze the RF data here which helped me finish this project in a few days.
The components needed:
I used a 433 Mhz module connected to a PIC microcontroller. (US model S, requires a 315Mhz module) Only a few other components are required.
1x PIC12F1822 or PIC10F200 microcontroller 1x TX-SAW MID/3V 1x Lithium cell, 3V 2x 100nf capacitor 1x 10uf capacitor 1x pushbutton
Please note that the PCB layout in /eagle was designed for the PIC10F200 microcontroller.
There is now a new version, based on the same chip Tesla uses in it's Charging Cable.
The chip is a Silabs Si4010, only one external component (capacitor) is required. I converted the Tesla specific bitstream for use with this microcontroller. As Silabs also provided a PCB layout file for 5 buttons, but only one button is needed, these files were modified. The PCB layout fit's the Polycase FB-20 keyfob housing.
All files for this version can be found in the /Si4010 folder.
Fully assembled Open Chargeport remote's are available here: http://www.stegen.com/ocp
for USA, you can contact lolachampcar on teslamotorsclub.com