Twizy ESP Composite Display

A power display for the Renault Twizy based on the ESP32, using composite video for the display. It uses a MCP2515 board to connect to the CAN bus in the Twizy.

What

I created this because the rear-view camera that I installed on my Twizy has a second video input on the display that is enabled whenever the camera is not in use. So I decided to repurpose that input and create a power display for the Twizy.

How

Needed Parts

• An ESP32 Board
• A MCP2515 CAN Bus Shield
• An OBD2 Plug
• A Rear-View Camera display with composite video input

Installation

• Flash the software to an ESP32 Board
• Connect GPIO 25 of the ESP board to the video input of the display (as well as GND).
• Connect the MCP2515 board like this:

• Connect the H and L outputs of the MCP board to the pins 6 and 14 of the OBD2 plug:

• Optionally connect a button between GPIO 27 and GND to switch the display mode (see below).

Power

If you have the sound system installed on the Twizy you should have a USB port that you can power the board from, otherwise you will need a 12V to USB adapter or use a buck converter to get 5V from the 12V line of the OBD2 port.

Usage

Usage is pretty self-explanatory, the display just displays the given info.

You can attach a switch to cycle the display mode to GPIO 27 of the ESP32 board (see above).

• Mode 1: Display power usage / recuperation as well as battery and motor temperature
• Mode 2: Additionally shows a large kph display
• Mode 3: Additionally shows a large rpm display
• Mode 4: Additionally displays the max/min power usage
• Mode 5: Additionally displays the charger and inverter temperature

I added the speed display as I am usually putting my phone in front of the original Twizy screen when I am using the navigation on my phone.

The set mode will be stored in EEPROM so on the next boot it will start in the mode you selected.

Hints

MCP2515 board

If you have issues talking to the CAN board, check if the frequency of your MPC2515 board is 8MHz (written on the silver quartz) - don't worry if its not, you only need to change one line in the code, search for 8MHZ and change it to 16MHZ.

The MCP2515 board is 5V but you don't need to worry, the ESP32 is 5V tolerant on the inputs.

Resources

Generally, if you have display issues, check the ESP_8BIT_composite Project if your issue came up already.

Thanks

Thanks go to bishibashi for his Twizy CAN Display project, which helped a lot to create this software.