BEST SIMPLE module for 50m signal transmittion?

Using Arduino General Electronics
1

I need to find radio transmitter and receiver pair (or just transceiver) for distance up to 50m that fits:
:exclamation::exclamation::exclamation::exclamation::exclamation: as cheap and as small as possible
:exclamation::exclamation::exclamation: not to interfere with my main 433MHz module, so it SHOULDN'T be 433MHz. It may be 868MHz or any frequency up to 2.4GHz
:exclamation: as simple as possible, with few pins

What I need is to transmit 8 digits from each of my light sensor to my main Arduino module. I've found such a module but it seems complex.

Please tell me, which pins I can omit in this module? Or maybe you know specific module which is better? Best for me is 3 pins (VCC, GND, SIGNAL) like I've used in 433MHz, but I can't use 433MHz here

Thank you in advance!

2

More details perhaps ?

Is the '50m signal transmission' ?

When there is good line of sight between transmitter and receiver ?

Underground ?

Underwater ?

1 Like
3

Yes, of course. Maximum distance between modules is 50meters. it is 2-3 meters above ground. Only obstacles are few (1-2) trees. Apart from trees, yes, there are no obstacles, good line of sight

4

@srnet

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What are you using for the current 433 MHz module and what's going on with that link (e.g. bi-directional vs uni-directional & packet size and rate & sensor/processor on the other end)?

Would it be possible to a multi-node network all on the 433 MHz which is zero extra cost to the existing node?

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...and which Arduino?

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Screenshot_1
Screenshot_11097×505 16.7 KB

The direction is from sensors to LoRa node only, and then from LoRa node to my main receiver (ME). No bi-directional.
For 433MHz part I already use CC1101 transceiver

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Arduino Nano. This must be as small and simple as possible

9

Have you looked at the NRF24L01?

By the way, the suggestions are going to be pretty random without having a lot more information about your application and design.

"best" choices don't happen without context.

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Yes, that's the module I mentioned in the original post. But there are 7pins used. Do I need all of them? I would prefer 3 pins, please see links in my original post. I will make lots of these modules, so I need simple solution

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There isn't one. Edit - well you could run wires, that's simple.

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No way for wires unfortunately. I'm just installing light sensors near the woods. That's the context. Height is 2-3 meters above ground. There's no additional obstacles

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Then you are out of luck. Maybe you could choose a different frequency for Lora.

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That is a tiny snippet of the context. With due respect.

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WeMos D1 mini or ESP-01 with ESP-NOW protocol should do several hundred meters.
Is power an issue?
Leo..

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16

Is this a commercial product ?

There are a number of RF devices that would cover that distance with only 3 pins needed.

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In most countries you are allowed to transmit on these frequencies only at low power and only at infrequent intervals.

So, many of the simple 433 MHz radios can operate on the same frequency and will only rarely interfere with each other.

With a good dipole antenna like shown below (34 cm from tip to tip), communications range is over 300 meters, clear line of sight.

dipole
dipole1000×597 151 KB

2 Likes
18

@srnet I'm installing a bunch of sensors near my own apartments, but if I succeed, yes it will be a commercial product too. Please share these specific RF device names. I found only 433MHz ones so far

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Are you aware that '433MHz module' are very very very common, so that some element of interference is exactly what you should expect ?

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Yes. That doesn't bother me. I'm installing it outside of the city. There will be very few interferences. I just need some RF module, not 433MHz