Random EV Lessons learned while tinkering with Electric Vehicle …

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BAIC E150 EV Electric Cars

Random EV

Posted by: randomev | 22, 2013

Mobile phone UI for DIY cars made with Pi

I have recently tested Raspberry Pi is a good DIY solution for car UI computer. It seems to work it has been in use for a few days now and it seems to run smoothly. Here is the basic of the system:

So Raspberry Pi is equipped an CAN-bus shield and an wlan I compiled a custom kernel supports both of these and wrote a very simple script to read values and them to web UI. CAN bus has new messages from every 250ms and from BMS 1 sec so update rate will not be so I m confident that RPi can easily all this.

I m using Arch-Linux as it seems to quickly and nicely with Pi. I my Raspberry PI always powered on as it t really use much energy few watts) and I have about battery. Raspberry Pi creates an WLAN around the car so I can easily to it.

I m most likely going to that with a proper router though (since doesn t seem to support encryption which I would much like to have).

For the Pi, I just made an 5v PSU from car usb-power adapter and enclosed it a Pi to a plastic box.

Here is a of the box:

BAIC E150 EV Electric Cars

Not pretty but hey, it s a 1st prototype

In the there are 3 devices: 1) Raspberry Pi, 2) Huette intelligent current-shunt and 3) few of our own So when everything is up and running, I ll be to read and control all these from a mobile phone. For I m only testing the system traction pack current.

But as already works, it should be easy to read and  display all the important values as well as min/max cell voltages and etc.). I m thinking about an USB-HDD to RPi because I want an for storing all that data for viewing and analysing. And I have that database writes quickly render my main useless so I m going to keep my data-partition on separate HDD-drive.

For now, the display only one simple gauge (justgage.com ) traction pack current but of this setup should be simple just add some UI-software for other values as You can see how my 1st working setup actually from this small


The source code is not yet ready for but eventually this all will likely be Open Source. For this is all I have I ll post when I update the display and get BMS boards also to display values on my phone.

BAIC E150 EV Electric Cars
BAIC E150 EV Electric Cars
BAIC E150 EV Electric Cars
BAIC E150 EV Electric Cars
BAIC E150 EV Electric Cars
BAIC E150 EV Electric Cars
BAIC E150 EV Electric Cars

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