CanLite ESP32 board for CAN Bus hacking support up to two high-side switches

Voltlog’s CanLite is not the first ESP32 CAN bus board we’ve covered here at CNX Software, having written about Olimex ESP32-EVB and CAN32 boards a few years ago.

But the open-source hardware, compact CanLite board offers an alternative for CAN bus hacking with a built-in automotive-grade DC-DC converter as well as an optional two-channel high-side automotive-grade switches capable of switching up to 6A per channel.

CANLite ESP32 CAN Bus board

CANLite key features and specifications:

  • Wireless module – ESP32-WROOM-32D module with Espressif ESP32-D0WD dual-core Tensilica processor, 4MB SPI flash, Wi-Fi 802.11 b/g/n up to 150 Mbps, Bluetooth 4.2 LE
  • Terminal block for CAN Bus (ISO 11898-2 standard) up to 1Mbps via SN65HVD231 CAN transceiver.
  • Output – High-side switching of the VBAT input up to 6A. (only if the option is purchased during checkout).
  • Programming – 6-pin JST-SH VoltLink pin header
  • Power Supply – 12V/0.5A via terminal block
  • Dimensions – TBD


The ESP32 CANLite board supports Arduino or ESP-IDF framework programming but no software code has been provided so far, but it should be possible to use the ESP32-CAN-Driver project, and other software used for other CAN bus board based on ESP32. What we have are the KiCAD schematics, PCB layout, BoM, and Gerber files on Github.

Since I had never heard about “high-side switches” I looked it up and STMicro explains it as follow:

High-side switches can safely drive high currents into complex (resistive, inductive and capacitive) grounded loads in compliance with the harsh automotive environment. This requires both a robust, low on-resistance power switch and accurate analog circuitry for diagnostic, protection and control functions.

VoltLog also happens to be a YouTuber, so you can get a detailed walk-through of the board in the video below.

YouTube video player

The CANLite board is available on Tindie for $30.99 without a high-side switch, and $4 more with one high-side switch. Stock is limited (10 boards at this time), and VoltLog does not plan to make more, at least for now, due to supply issues.


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