RF modules recomendations?


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    Fanatical Contributor Tim's Avatar
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    Default RF modules recomendations?

    Hi,

    I'm looking at new product. It involves a hand held temp meter/indicator talking to base unit. Now I could use a cable but thinking about the distance involved some cases it would be a pain. The distance is actually only 4-5 mtrs max but to long really for a cable.

    So I'm looking for a simple rf module that can cover the short distance involved. 434, 868 not sure. I may be on sale in the USA so not sure 434mhz might be out. Bluetooth is out also as I had the thing due to so many issues with headphones, car etc. It will tx approx every 1 second and the packet will be just a few bytes. I doubt I need 2 way.

    I'm not interested in having to roll my own FR code so a simple ttl input and ttl output would be ideal eg RS232. It can be 2400 or 9600. Speed is not an issue.

    Any recomendations?

    Thanks

    Tim
    Tim

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    Prolific Poster charliecoultas's Avatar
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    Default Re: RF modules recomendations?

    George had a lot of success with HC-12 modules. I think they are 434Mhz but they look very simple: RS232, 9600 by default, cheap.

    Charlie

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    Prolific Poster towlerg's Avatar
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    Default Re: RF modules recomendations?

    HC-12 operates 433.4-473.0MHz not sure if that excludes it, it has 100 channels and defaults to 0. Otherwise super simple and super cheap, defaults to 9600, no problem with range, 3.3v
    George.

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    Fanatical Contributor Tim's Avatar
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    Default Re: RF modules recomendations?

    Thanks

    Looks perfect

    Tim
    Tim

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    Fanatical Contributor top204's Avatar
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    Default Re: RF modules recomendations?

    You can try the nRF2401+ tranceivers. They operate at quite long ranges and are extremely inexpensive.

    I created a library for them a few years back for a project I was doing for someone, and I've placed it on my google drive here:

    Proton nRF24L01+ Demo.zip

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    Default Re: RF modules recomendations?

    nRF24L01+ is excellent if your looking for a high speed bidirectional data transfer environment with auto Ack and auto retransmit but HC-12 is just so easy and suits your requirements (except the 433 thing).
    George.

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    Prolific Poster John Drew's Avatar
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    Default Re: RF modules recomendations?

    Tim,
    Be aware that the range 420-450MHz is an amateur radio allocation. There may be transmitters outputting up to 1kW, especially around 432-433. There are also satellite transmissions between 435-436. I suggest you stick to 433-434 as amateurs avoid transmitting there as they know LIPD units operate there. In addition, for the above reason I suggest you have handshaking and error correction if your device is anything but a hobby application.
    John

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    Fanatical Contributor Tim's Avatar
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    Default Re: RF modules recomendations?

    Thanks Les

    They look better and compatible in the USA I think.

    Quote Originally Posted by top204 View Post
    You can try the nRF2401+ tranceivers. They operate at quite long ranges and are extremely inexpensive.

    I created a library for them a few years back for a project I was doing for someone, and I've placed it on my google drive here:

    Proton nRF24L01+ Demo.zip
    Tim

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    Default Re: RF modules recomendations?

    Morning Tim

    You could look at the RFM22 From Hope Rf. http://www.hoperf.com/, There is a whole range of Transceivers for many applications.
    There Frequency and power can be set. They work extremely well. Some of there module are built around Silicone Labs Chips https://www.silabs.com/

    Kind Regards

    Craig

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    Default Re: RF modules recomendations?

    The NRF24L01+ modules are very cheap. I buy them with original IC for $1.2 each or $0.80 for the Si24 clone which works just as good with a little higher current but can be programmed to add 2-3dBm power. They work up to 30-35 meters without external antennas. If you need more range, you can always put the high power module ($7) with antenna on the base station. The frequency is compatible world wide and it will co-exist with almost any radio traffic around it. and the protocol supports retransmits if NO ACK and payload with ACK. I think I put the demos on the forum but can always help if anyone needs something specific.

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