EON

The EON is the name associated in the Comma.ai community to the device that sits in your windshield and does all the calculations for LKA and ACC.

Comma.ai EON DevKit

EON DevKit (or FrEON)

The EON is based on the Qualcom Snapdragon 821 mobile platform. Phones like OnePlus 3T or LeEco LePro3 have been used to create the FrEON (the free EON). You can find some instructions here.

If you chose to buy your EON already made, you can do so from Comma.ai store for $599 USD.

Also, as we run more and more processing on the EON, it gets hotter and hotter. Some of us have opted to replace the original fan (which is also noisy when you're inside of a Tesla) with super quiet Noctua fans. $15 from Amazon and soldering two wires and you're good to go! We might have to actually double that to two Noctua fans in the neat future.

Also, keeping the phone screen off helps keeping the temperature low. I know, in the beginning one wants to see those lines matching the lines in the video, but after a while you stop paying attention to the screen. And if you have the IC integration all the data is on IC anyway. So turn that screen off and you will see the temperature drop about 15F.

Code for power management of battery (only charging when below 60% and stopping the charge when it reaches 80%) has helped keep the battery temperature lower and hence the CPU cooler. And this is a free upgrade, as the code is already in my repo.

Here is a helpful EON bash profile (.bash_profile).

Installing the EON

EON installation is pretty simple. Your main objective is to ensure the EON is level with the ground, and pointed as straight as you can get it. If you're uncomfortable "eyeballing it," you may want to use:

• A measuring tape
• A roll of masking tape
• A friend to help

Instructions

1. Find a place at the bottom of the windshield, along the driver's side pillar that has a similar position on the passenger side (such as the place where the corner of the front hood meets the fender).
2. With the tape starting from that point, mark 3 places along the side of the windshield. Use the edge of the masking tape to mark them. I personally used 3" from the bottom, the top of the windshield and then about 1/3 from the bottom, 2/3 from the top. It does not matter what the measuring tape says, as long as it says the SAME distance on driver's and passenger's sides.
3. Repeat the process on the other side of the windshield, ensuring you mark the same spots.
4. measure the distance between one edge of the windshield and the other end, keeping the tape at each pair of marked points from before. use masking tape to mark the middle of the windshield. again, use the EDGE of the tape, not the center.
5. Now use a long piece of masking tape to mark the center of the windshield from top to bottom. This (if you did everything correctly) will cover all 3 of your markers from before and provide a straight line. One edge of the masking tape is now the perfect middle of the windshield. Your mount will have to be aligned with that for a perfect position.
6. Take a small piece of tape and mark the middle of the GoPro mount. use a slightly longer piece than the go-pro (maybe 1/4-1/2" more on each side) and ensure it is straight and down the middle of the GoPro. If, when looking from inside of the car, your tape is to the RIGHT of the center, then put the tape on the LEFT side of the GoPro. Reverse if the other way.
7. Using your EON without the mounting bracket, determine the location along the center of the windshield where you want it placed. Make sure the grove on the support is alongside the center of the windshield. use a small piece of masking tape to mark the upper part of the position where you want your EON to be.
8. Remove the RED protective tape from the back of the 3M adhesive and be ready to place the GoPro on the windshield. Align the masking tape we placed on the GoPro mount on the inside with the masking tape we have on the outside of the windshield. They should not overlap at all AND you should not see light either. when you are confident on the position press hard on the mount.
9. Remove all masking tape. You are done. You now have a perfectly centered, perfectly vertical EON.

Installing OpenPilot for Tesla

Comma.ai doesn't support Tesla cars. That's why we maintain our own fork, which you will have to manually check out after setting up your EON.

DON’T INSTALL ON ANYTHING OTHER THAN A TESLA!
(Someone bricked their Jeep trying.)

Git the Tesla OP Fork

SSH into your EON and execute the following commands (you need internet connectivity on your EON):

rm -rf /data/openpilot
git clone --depth 1 https://github.com/BogGyver/openpilot.git -b tesla_devel /data/openpilot
reboot

The first reboot will take around 20 minutes to set everything up.

Edit your Config

After the EON has booted you can edit your config, which now has been automatically created.
At the top find user_handle = your_tinkla_username and change your_tinkla_username to your Tinkla username (preferred, if available) or to your Discord handle.

nano /data/bb_openpilot.cfg

Make sure to set use_tesla_gps = True in case you're using a White Panda (Grey Panda has GPS built in). With GPS info of your drives you're helping Comma to improve their models (OpenPilot uploads your drives to their servers). Keep in mind that config changes only apply after rebooting the EON.

Flash your Panda

After installing or updating OpenPilot on your EON, you need to also update the software on your Panda. Here's how:

In your Tesla while it says “Car Off” connect your Panda to your Giraffe rev B OBD (or EPAS OBD). Connect your EON to the Panda via USB. Then SSH in and run:

cd /data/openpilot/panda/board
killall boardd
make clean
make && sleep 1 && (make recover || make recover) && echo Success! Rebooting in 2s... && sleep 2 && reboot

The kill command ensures that the EON stops regular communication to the Panda. That's also why a reboot is needed at the end. If any error occurs (which of course should not happen) the reboot will be skipped so you can troubleshoot. AssertionErrors should be fixed by rebooting EON and trying a second time. Optionally you may also power cycle your Panda by reseating it.

Final steps

Finally, check here to learn more about all the controls, functions and features related to longitudinal control: Using adaptive cruise control

Experiencing issues?
In case you use a Pedal and it just won't work, chances are it doesn't have Tesla firmware on it yet. You can flash it with this guide. Various other problems can be related to wiring, so double check each installation page, especially EPAS Harness.
On any other issue, please use the search function or ask us on Discord.