Category: Hardware

Dongle firmware

The software consists of a few functional parts. First, there is the CANbus library. While the ESP32 is around for a while now and there is good CAN support in Espressif’s IDF, the support in the Arduino environment is mediocre

Dongle testing (more geek talk)

You might want to have a peek at this “Frankenstein contraption” testing rig. Things have moved on since (more on that in a later post), but this is how projects like this start. Note that I laid it out neatly

A DIY CanZE dongle

The KonnWEI dongles are, though the most stable in terms of what you get when you buy, not the best to run CanZE with, especially when fast performance is required. Think like the Driving, Braking and Consumption screens. For the

Dongle tester app

Why does my dongle not work? Is it working? What version is it? Why do only some of the values get displayed? I recently discovered an app that can test a dongle and tell you what version it is, so

Dongle trouble #5

When I got home tonight the KONNWEI dongle I ordered on August the 29th had arrived directly from China. I ordered it here. Less than 9 euros. It had the proper 120 ohm resistance on the CANbus. Next, I opened

Dongle trouble #4: solution. Sort of

Short glossary: We have no ties with KONNWEI. Actually KONNWEI902s are knock offs of real ELM327 based hardware, but they have been the only consistently stable ones we have found. And we haven’t spotted “knockoffs of KONNWEI knockoffs”. Yet. It

Dongle trouble #3

Today I received an email stating that some KONNWEI’s are shipped with a 20 ohm resistor across the CANbus. This is a massive production fault. First of all, normal bus termination is 120 ohms, second, the dongle should not impose

Dongle trouble #2

A few days ago I tested that dongle I received and things were not looking good. Flow control commands are not accepted, and while I assured it is able to both send and receive data on the CANbus *) it

Dongle trouble ahead?

This is an intermediate post. I got a report from a user who ordered what seemed to be a bona fide KONNWEI, but had no success. That was slightly alarming, but one error could be anything. He send me the

Developers geek talk – part 2

Please skip if you are getting tired of this development talk 🙂 …… While I was debugging the WiFi interface today I was, of course still getting in and out, now and then resetting the dongle, making sure th car