Digital read problem/noise and rf transmission

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xeebee

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Hello,

I have some problem for receiving rf transmission from a DIO-remote (home easy protocol). I use for this a classic rf receiver 433Mhz module and a teensy LC (here RX470C-V01,https://robiz.net/rx470cwl102). I tried many librairies for testing first of all and mainly the rc-switch librairy https://github.com/sui77/rc-switch and the SimpleRcScanner https://github.com/sui77/SimpleRcScanner for decoding remote signal and also to see the signal received by the micro-controller (teensy LC). So to analyze the signal I use the simpleRcScanner that show the high and low with their duration.

For one remote, it works fine. For another one, I have some trouble. There is often very short high that should'nt be there :
teensy prob.png

It works with all remote fine with an arduino uno. I had some similar trouble with a seeeduino XIAO (https://wiki.seeedstudio.com/Seeeduino-XIAO/) which have a very similar specification with the teensy LC. I could solve the problem with the seeeduino using another power source (https://www.docdroid.net/9oyf/mb-v2-datasheet-pdf) for the rf 433 receiver module.

Ok it works fine with some other microcontroller. But I'd like to try to understand why it doesn't work with the teensy LC as it should work in theory. I tried many things like :
- powering the teensy LC (Vin with 5v) and the rf receiver module (3.3V) with the MB v2 power using a common ground. I tried different pin ground on the teensy LC (because there is many pin ground, by the way why?)
- I did some test without usb power and monitoring that let think that it doesn't work (I use some program that work well with arduino and XIAO where a led blink when the code is well decoded).
- I try using a pull down resistor
- I try to put the receiver a little away from the teensy to avoid micro-controller interference

I power the teensy LC with usb power or with 5V (because Vin 3.7v to 5.5v) and the rf receiver module with 3.3v (because the data pin is 3.3volt with 3.3v power and 5v with 5v power, it is said no more than 3.3v for pin receive)

Do you have some idea what could I do as test? Do you have some explication that could help?

Any idea is welcome ...

Great thanks :)
 
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