K8055 Project

Kits PC Related Projects
1

Hi,

I’ve got a small project I wish to accomplish using my K8055 interface card:

I wish to rewire a remote control, allowing the K8055 to control the input, therefore removing the user interaction (or the need for a button to be pressed on the remote).

I understand that a relay should be used to control an interaction on an output circuit, however, is this truely neccessary for a circuit that only needs 3V to work? Is there an alternative to using relays?

I have a rather vague electronics knowledge, so I don’t truely know what I’m doing, but where better to start than on a simple 3V circuit.

Thanks…

2

I think you have to use relays in this case.
In the remote controllers the buttons are typically connected in a matrix between the terminals of the remote controller IC. The digital outputs of the K8055 can only pull down to GND.

In this datasheet you’ll see an example of the button connection in a remote controller:
datasheetcatalog.org/datashe … AA3010.pdf

Do you know the type of the controller IC of this remote you have?

3

Hi, thank you for your reply.

The IC controller on the remote is:

pdf1.alldatasheet.com/datasheet- … M5021.html

The part number is SM5021.

Its basically a fan remote control, with 6 buttons. I’m hoping to hook it up to the USB interface card, and allow the computer to control the fans via IR. Can then set it up to automattically turn the fans on in the morning and off in the evening, while the PC is turned on. We are lazy in this house, and it’ll be a life saver. :slight_smile:

4

In this remote controller the buttons are between GND and the inputs of the controller IC SM5021.
It seems that you can connect the K8055 digital outputs directly in parallel of the buttons.
Just connect the digital outputs of the K8055 to SM5021’s pins labeled K1…K8 (where the buttons are connected).
Connect the GND terminal of the K8055 to the Vss pin of the SM5021.

I think this should work…

5

I’ll give it a go. I will let you know how it goes.

Thank you.

6

Right, I tested it on a temporary basis using crocodile clips, and it appears to work with the setup that you described. Tomorrow I will have some soldering to do… :slight_smile:

Thank you very much for your help.

7

Nice you got it working!
It seems your first K8055 project will be a success! :slight_smile:
I wish you luck with the soldering too…

8

Soldering went okay!

I’ve wired it all up today, and tested it, it seems to work fine.

Spent some time making a wooden enclosure for the K8055 today, I’m pleased with the results, something has to go wrong soon…

In a few weeks time I might look into hooking up a temperature sensor, seeing as it controls my ceiling fans presently. I will most probably be back here with more troubles when I attempt that… :smiley:

9

Nice you got your fan control system working!
Indeed it may be good idea to add a temperature sensor there too…
In this forum has been some discussions about the temperature sensors and temperature measuring with the K8055 / VM110.
One possible sensor may be the VM132.