Support for HotRC / Rlaarlo receivers

[c0ldtech]

It would be nice to have support for the HotRC receivers (which are also being used by Rlaarlo it seems). I'd be more than willing to order a receiver and have it sent to someone if it helps.

[pascallanger]

Can you open one radio and receiver to see what kind of RF chip they are using?
If it looks doable (no guarantee) I would need a TX and RX set to reverse the protocol.

[c0ldtech]

I'll be receiving a set in a few days. I'll let you know and post here.

[c0ldtech]

I guess the chips you'd be interested in are the ones without markings?

[pascallanger]

The RF component looks like a LT8900 or LT8910. You could spy the SPI bus with a logic analyzer. It might be doable but it depends on the component and configuration...

[c0ldtech]

Unfortunately I don't have the hardware or skill to do that myself. Would you be willing to look into it? I could try sending you a receiver/transmitter combo.

[pascallanger]

Not sure how much it will cost to send a TX+RX to France versus donating to purchase a set...
Also there is no guarantee at all that this protocol can be added. If the RF chip is really a LT89xx, it has not been emulated yet apart for the Shenqi protocol which was not using special features.

[c0ldtech]

This is the one I have and should cover all available functions:

https://www.aliexpress.com/item/1005007793346834.html?spm=a2g0o.productlist.main.9.348e48aaW7WtU4&algo_pvid=b27eeace-0f88-422b-99e3-adc6ffc3069a&algo_exp_id=b27eeace-0f88-422b-99e3-adc6ffc3069a-8&pdp_ext_f=%7B%22order%22%3A%2257%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21EUR%2138.98%2123.39%21%21%2140.03%2124.02%21%40%2112000042222094364%21sea%21DE%212333224124%21X&curPageLogUid=NbdEe5R2nVm4&utparam-url=scene%3Asearch%7Cquery_from%3A

I'd gladly donate the amount it costs, I'd see it as my thanks to the community. Would that be OK?

And I know it might not work out, but it would be nice if it did.

[pascallanger]

I can take a look but once again there is no warranty that it will work and that will take some time (weeks).
I'm in France so look at the shipping cost both ways vs donating to purchase a set.

[pascallanger]

This one with light right:

Since I can't see light ports on the F-04AT...

[c0ldtech]

You could also get that one, but the F-04AT is the one that I meant - it can use channel 5 for lights (they can be directly connected there, at least that's how it is done on the Rlaarlo Omni Terminator).

[pascallanger]

I'm wondering how the lights work on yours. Is it a simple on off on a specific channel?

[c0ldtech]

Yes, seems like it. Right now I have another receiver in the car in order to be able to use the MT12. As expected, just plugging the lights into the new receiver doesn't do anything. I needed a dedicated light controller to make them work.

So the lights seem to be just a regular LED strip without any included logic. That in turn should mean channel 5 is just a simple on/off. On the original remote it's dedicated to a regular on/off button, no additional states or anything.

[pascallanger]

I've placed the order, let's see when I get it.