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I am looking for suggestions for wireless transmitter/receiver chips/circuitry. I have the following system in mind:

  • Multiple transmitters to one receiver Transmitters do not have access to microcontroller and have to run off batteries that can only supply a few mAmp.
  • Bi-directional communication not a must, but a nice to have
  • I only need to send a byte or two of data to and from
  • System needs to be as miniature as possible, thus SMD IC's and chips are a must
  • System requires 50m or more transmission range

I have developed a solution that uses simple 433MHz transmitters with HT12 encoders and the corresponding receiver system on the other side. The downfall of this system is that while one transmitter is transmitting it will jam any other transmitter, and its one directional.

Does anyone have suggestions for the above? Bluetooth, BLE, RF, etc?

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  • \$\begingroup\$ Hi Misha! Nice having you here. However, your first sentence reads like you're looking for product recommendations, which are explicitly off-topic here. \$\endgroup\$ – Marcus Müller Mar 1 at 18:31
  • \$\begingroup\$ If the TX side doesn't have a controller, how do you control when data is sent? \$\endgroup\$ – Aaron Mar 1 at 19:01
  • \$\begingroup\$ Can you post a schematic of your present system? \$\endgroup\$ – Aaron Mar 1 at 19:01
  • \$\begingroup\$ Take a look at RFID it may do what you want. \$\endgroup\$ – Gil Mar 1 at 21:57
  • \$\begingroup\$ If the TX side can't receive, it also can't be told when to transmit, leaving you with the problem of it having to always be ON and always transmitting, at least at some minimum frequency. For a low power device this seems a significant problem. \$\endgroup\$ – K H Mar 2 at 2:09
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Transmitters do not have access to microcontroller

Without some kind of brains behind the transmitter, "collisions" are guaranteed. ((All)) multi-user environments, from old party-line telephone systems to 5G, require brains behind the transmitter to recognize and recover from whatever form of collision/over-talking/garbled transmission that has taken place. A key requirement for this is that each transmitter must have a receiver, either to be told when to transmit, to to be told to re-transmit the last message.

Examples of those two options are more popularly know as ARCnet (a form of token ring) and Ethernet (CSMA/CD - the CD stands for collision detection). You don't need anything that complex for a small, low speed, dedicated system. But note that Bluetooth and BLE both are bi-directional systems with collision handling built into their communication protocols.

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