robin7331 / ikea-hackant Goto Github PK

Hi. I am trying to hack my Bekant desk, but my Arduino isn't capturing any LIN frames. I tried connecting the wire, that normally goes to digital pin 2, to analog pin 2 and see what readings I would get. It turns out it constantly reads value 8 (sometimes 9). I think the voltage on LIN wire is too low to trigger frame detection. Do you have an idea what might be the cause?

I forgot to mention. The stock controller works fine, I can move the table without any problems.

Awesome work, could you specify the GND PIN you soldered on the board? there are 5 holes in the back of the connector. which one is the correct one? in the middle?

Hey!

This is really great work. I’m not an EE, so following this was a bit hard for me. But... I was wondering how hard it would be convert your work to something that works on a Raspberry PI.

My thought is to use a Raspberry Pi + buttons as the controller. Then we can use something like this on it. Then... I can say “Hey Siri, I want to sit” and the desk goes to the right position.

Let me know how unrealistic this is.

Hi, I'm thinking of using an ESP8266 to control the desk. Its GPIO pin can be set to either 3.3V or 0V.

Can I connect the pin directly to the button? So that I can set the GPIO to 0 to simulate the button being pushed, and reset it back to 3.3V when I want it to stop.

Thanks.

Would love to see a case designed for this :)

Have you put a scope or meter on the power line ("24V")? The power supply rests at ~24V but then ramps to ~35V when the desk is moving. My power supply went out so I've been trying to find an off the shelf solution. A generic 24V power supply results in very slow desk movement and a generic 36V matches the proper speed but without the slower ramp up. It looks like you are using a MP1584EN converter which is rated to 28V input.

Please attach an image with the wiring of the Arduino to the LIN contoller.

Hi,

I have setup the hardware on a breadboard connected to the desk and I got everything working fine. However, I do NOT receive LIN frames when using R6 to pull-up the D2 line to 5V. Admittedly, I am using a different transistor. The one I had available is a BC547 instead of the 2N3904.

As I do not have enough background in electronics design, I that an issue? Is that caused by my different transistor?

Regards,

Robert