Hi All

My first post because I am beginning my learning with RF devices and continuing my software learning. I think I maybe making some rookie errors so please help if you can.

I am trying to decode some info from some RF sensors and do some calculations on the. The sensors came with a receiver mounted to a board which includes a USB to serial converter chip (CH340T). I think/hope the RF reciever board uses a serial output but i've tried a TTL to USB converter and whilst I get data its garbage and not spaced properly etc. The RF board has a number which I think is 8281 (could be 1828) and I found a datasheet for an ESP8285 so i've been using the serial settings for that because I don't have much else to go on.

The reason for using the serial output is I would like to put this into an arduino without using a USB shield (which appear to be a dead product for Arduino now).

How do I try and trace if I am doing the right thing, I can't find data on the board or chip are there any good resources? Should I be trying to read the serial off the CH340T serial in pin directly (I am not at the moment i'm using a soldering joint marked 'DATA' which I think is connected to the CH340T.



Thankyou for any info/advice

 

hi DS50,
Welcome to AAC.
Do you have a circuit diagram to post, showing the connections, also any part numbers for the sensor.?
E

 

Do you have (access to) an oscilloscope?

 

hi DS50,
Welcome to AAC.
Do you have a circuit diagram to post, showing the connections, also any part numbers for the sensor.?
E

Unfortunatly not,

 

Do you have (access to) an oscilloscope?

Thanks, I presume this would be to put on the 'Data' pin and try and see if I can see bit time width (for speed), would this help me identify the protocol too? I may be able to borrow one.

 

Getting the speed right would be excellent start.

 

Getting the speed right would be excellent start.

Thanks although I've tried all of them so far and it hasn't decreased the jargon so I'm hoping I have the wrong protocol. I guess I could try scoping the line to check I see the size of messages I'm expecting and the levels. That will help narrow down the protocol I guess.

 

With a bit of cunning, and depending on the 'scope, you should be able to get whether it is 7, 8, or 9 bits.