How to get 433 MHz receiver to work

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jokeri
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How to get 433 MHz receiver to work

Unread post by jokeri » Mon May 20, 2019 5:32 am

Hello,
I got a 433 MHz like the XY-MK-5V receiver, connected the signal line via a voltage divider from 5V to 3.3V to the N2 and I installed the following tool but I cannot get it to receive data although it is based on wiringpi.
https://github.com/ninjablocks/433Utils

I installed wiringpi from hardkernel and added "-lpthread -lm -lrt" in the Makefile so no errors. The receiver script starts but no signals receiving.
Do you have any hint? Or is there another library with which I can receive 433MHz in Python with the N2? RPI.GPIO for Odroid doesn't work (yet?) so I can not try those libraries.
Thanks.

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Re: How to get 433 MHz receiver to work

Unread post by odroid » Mon May 20, 2019 9:57 am

Is it compatible with NRF24 433Mhz connection viewtopic.php?f=116&t=24698?

Can you tell me which bus you are using with your device? I2C? UART? SPI?

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Re: How to get 433 MHz receiver to work

Unread post by jokeri » Wed May 22, 2019 6:03 am

Thanks for reply. The receiver is just connected to 5V, GND and a GPIO pin and the library basically works via interrupt routine of wiringpi.
I tested the isr example in wiringpi and I see the interrupts of the receiver.
The NRF24 is a 2.4GHz sender/receiver and works different compared to those for example XY-MK-5V. Do you have other suggestions? I am not sure what else I can try now.

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Re: How to get 433 MHz receiver to work

Unread post by odroid » Wed May 22, 2019 9:07 am

I didn't know it uses one single wire for receiving data.
I have no experience of 433Mhz wireless communication.

I hope other users can give you some ideas.

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Re: How to get 433 MHz receiver to work

Unread post by ab1jx » Tue Sep 10, 2019 6:13 am

You might look at rtl_433. I use it to monitor temperatures from an Oregon Scientific sensor with a $10 RTL2832 USB dongle, I've been doing it for about 4 years. Roughly 1 data point per minute, so about 1.6 million points so far.
fbtemps.png
fbtemps.png (23.74 KiB) Viewed 91 times
That's a 1-month moving average that's plotted, too much noise otherwise.

Sorry i don't do Python. I run rtl_433 > text files and religiously gather and store them. Then I wrote some C which extracts the numbers and puts them into tab-delimited files. Then they go into a PostgreSQL database for duplicate removal and sorting. I feed cleaned data to Gnuplot.

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