wireless module

Using Arduino Project Guidance
1

Hello

Can someone please suggest me wireless devices to sent sensor data for the range 20meters and devices will be in the enclosure.

with external antenna is also ok but everything will be kept inside aluminum enclosure.

Thank you

2

There are NRF24L01 radios with external antennas.

Here is a tutorial on their use.

Any wireless device will work better with the antenna outside the metal enclosure. They may have reduced range if they work at all with the antenna inside.

3

Thank you.

what will be the range if i keep device in metal enclosure?
both receiver and transmitter will be in different metal enclosure.

4

CC1101 texas is another one for long range but difficult to program. I use it for toggle the relay only.

5

bmg1234:
what will be the range if i keep device in metal enclosure?

Just assume they wont work at all.

6

@srnet

Are you sure because i want to know this before i start? are you sure this will not work if we keep device in metal enclosure.

7

are you sure this will not work if we keep device in metal enclosure.

For a radio to work, the antenna must be outside of a metal enclosure, and in most cases, perpendicular to it.

8

Is it same with all Arduino wireless modules? are there any Bluetooth module which can pair if both transmitter and receiver are placed in metal enclosure and kept at min 10 meters range

9

Metal enclosures (with no holes in them) are very effective barriers to radio and light waves.

10

bmg1234:
@srnet

Are you sure because i want to know this before i start? are you sure this will not work if we keep device in metal enclosure.

If you choose not to believe us, is it really so difficult to try it for youself ?????

11

I tried with hc-05 it didn't work. so i am asking are there any other Bluetooth which can pass signal through metal so that i can try.

12

bmg1234:
I tried with hc-05 it didn't work. so i am asking are there any other Bluetooth which can pass signal through metal so that i can try.

Superman can see thru metal, but you can't. When you can then you can send radio signals throu metal.

Paul

13

bmg1234:
Are you sure because i want to know this before i start? are you sure this will not work if we keep device in metal enclosure.

Google for "Faraday Shield". I'm not going to type it in for you.

14

We are having fun of course.

You can run a Wireless module in an alluminium enclosure, but you will need some holes in it to let the RF out.

By my calculation (not checked) at around the point the surface area of the hole (or holes) just about exceeds the surface area of the enclosure, reception is around the same as if there was no enclosure.

15

Would "the surface area of the enclosure" be the total enclosure area minus the hole area?

If not, am I correct in concluding from your presumably arduous calculation that "no enclosure" would be roughly equal in performance to "no enclosure"?

16

Would "the surface area of the enclosure" be the total enclosure area minus the hole area?

Indeed No, I meant that the "the surface area of the enclosure" was to be the original undrilled surface area.

If not, am I correct in concluding from your presumably arduous calculation that "no enclosure" would be roughly equal in performance to "no enclosure"?

Not sure, I will need to check, more sums .................

17

srnet:
We are having fun of course.

You can run a Wireless module in an alluminium enclosure, but you will need some holes in it to let the RF out.

By my calculation (not checked) at around the point the surface area of the hole (or holes) just about exceeds the surface area of the enclosure, reception is around the same as if there was no enclosure.

Actual "holes" are not necessary. Google "slot antenna". Any narrow slot, 1/4 wave length long will act as an antenna. This is part of what "stealth" aircraft eliminated to not reflect radar. Also main reason Radar does reflect aircraft.

Paul

18

Ahh, I get it! More clearly stated, a metal enclosure with zero or negative surface area would perform roughly equivalent to "no enclosure".

But, could an enclosure with negative surface area be even better than none at all?

19

Paul_KD7HB:
Any narrow slot, 1/4 wave length long will act as an antenna.

You mean a half wavelength slot.

20

Paul__B:
You mean a half wavelength slot.

Probably. Never used one.

Paul