Is it possible to use TDMA or some kind of time synchronization / pseudo random coding for a number of transmitters so that they can be interfaced with a single master receiver without jamming?
How to implement TDMA with basic 433 MHz transmitter receiver pairs
433mhzreceiverRFtdmatransmitter
Related Solutions
Sorry that I can't point you to an answer, but I can shed some light on why Google doesn't come up with much (my response is too long for a comment). The reason is very few designers have access to the equipment necessary to properly design a 433MHz circuit from scratch. Normal oscilloscopes are definitely out, and every little 0.1mm corner of a pad of your circuit board is actually a tiny inductor and capacitor connected to every other part of your circuit (parasitic/stray inductances and capacitances are killer at frequencies that high).
Also, the schematic of a 433MHz design is impossible to divorce from the geometry of the PCB layout. In other words, they would have to give you the schematic as well as the exact PCB geometry to make it work. Also, unfortunately, hand soldering is out due to parasitics. (Soldering an antenna on is one thing, but soldering the whole board is going to completely change the response of the circuit).
I don't mean to discourage you. I just want to make sure you know you're trying to slay a very big giant.
Are you sure that your module works well to 12 V?
Since it is the "XY-MK-5V" model I think it has the voltage up to 5 V as ideal.
For all I know, these modules work well between 3.3 V and 5 V, maybe saturating the circuit.
Really, the transmitter work with up to 12 V.
But I suspect that it does not work at the frequency in question. See, there are a lot of bad information on the Internet about them.
- Product Model: MX-FS-03V
- Launch distance: 20-200 meters (different voltage, different results)
- Operating voltage: 3.5-12 V
- Dimensions: 19 * 19 mm
- Operating mode: AM
- Transfer rate: 4 KB/s
- Transmitting power: 10 mW
- Transmitting frequency: 315 MHz
- An external antenna: 25 cm ordinary multi-core or single-core line
- Product Model: MX-05V
- Operating voltage: DC5V
- Quiescent Current: 4 mA
- Receiving frequency:315 MHz
- Receiver sensitivity:-105 dB
See more at: How to use 315 MHz RF transmitter and receiver modules with an Arduino
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Best Answer
Without two-way communication, or a way of precisely synchronising the time, you can't.
What you can do is have your device transmit its message several times, with a random delay between the messages. This improves the chance of at least one message getting through.
Of course there's a fundamental limit to the number of transmitters that can talk at the same time, depending on the length of the message, the total time you're prepared to wait, and the probability of success that you're happy with.
You could write a simple program to investigate this, to find out how many transmissions you need to have a reasonable chance of success.