How to communicate over 433mhz radio?

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tylersuard
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Joined: Mon Jan 21, 2019 4:09 pm

How to communicate over 433mhz radio?

Post by tylersuard » Tue Jun 18, 2019 1:20 pm

Hello. I’m trying to get my ESP8266 to send signals via 433mhz transmitter that another device can receive and translate. How do I do this? Thanks in advance for your help.

OutoftheBOTS_
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Re: How to communicate over 433mhz radio?

Post by OutoftheBOTS_ » Tue Jun 18, 2019 9:41 pm

Using radio link requires checking of data received is correct. A simple way to do this is use a checksum. Either way it will require a 2 way link so that the receiver can send back to the sender if the checksum added up correctly before the next packet of data is sent.

The exact hardware used also makes a huge difference I experimented with really common type of transmitter that has an auto gain control but it is the worse as as the auto gain keeps getting turned all the way up then reviving a lot of noise.

I found this type to give me much better data without a lot of noise https://www.aliexpress.com/item/2pcs-X- ... 4c4diGuL1x

U can see wiring here http://www.rflink.nl/blog2/wiring

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jimmo
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Location: Sydney, Australia

Re: How to communicate over 433mhz radio?

Post by jimmo » Tue Jun 18, 2019 9:48 pm

tylersuard wrote:
Tue Jun 18, 2019 1:20 pm
Hello. I’m trying to get my ESP8266 to send signals via 433mhz transmitter that another device can receive and translate. How do I do this? Thanks in advance for your help.
What sort of transmitter module do you have (link to datasheet)? Is the other device another esp8266 with a corresponding receiver or an existing applicance or something that you're trying to control? If the latter, do you know what the packet format / protocol is?

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jimmo
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Re: How to communicate over 433mhz radio?

Post by jimmo » Tue Jun 18, 2019 9:51 pm

This is a good talk I saw a few years ago on the topic of 433MHz radio https://youtu.be/3BNNY6_r3tQ

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