The problem is, its a wearable so I need it to be pretty compact.

And you are trying to use nRF52832?
Have you looked at the size of HC-05 module?

 

Are you talking about a simple status signal, such as press a button here and get an indication over there? Or a sensor detects something here and sends an alert to there? Technically, a bit, but not explicitly computer data related?

ak

Yes exactly, I just want to be able to communicate a button press between the two devices and have the other one light up and vibrate

 

Yes exactly, I just want to be able to communicate a button press between the two devices and have the other one light up and vibrate

That is what is known as data.

 

what is your definition of "wearable"?

 

Yes exactly, I just want to be able to communicate a button press between the two devices and have the other one light up and vibrate

so this does not need to be anything fancy, could be purely analog too...
make an RF transmitter, modulate it with audible tone and activate it on a button press.
and at some distance away have a radio receiver...

 

That is what is known as data.

I don’t know why you’re getting so caught up on this one data message. I just made a small mistake. I only need a binary on/off signal

 

what is your definition of "wearable"?

View attachment 323110

I just mean a small piece of jewellery, a cylinder with a diameter of 22mm

 

so this does not need to be anything fancy, could be purely analog too...
make an RF transmitter, modulate it with audible tone and activate it on a button press.
and at some distance away have a radio receiver...

How compact could I make this setup. I need this to work over long distances (<40km)

 

And you are trying to use nRF52832?
Have you looked at the size of HC-05 module?

Well the ISP1507_AL is 8x8x1mm, whereas as far as I can tell the HC-05 is 44×16×7mm. I could be completely wrong or looking at the wrong module or something, but the ISP1507_AL fits in the dimensions I need it too, so I don't see why I shouldn't use it.

 

8 x 8 x 1mm is the size of the chip. What are you going to do with it once you get it in your hand?
If you want to play that game, nRF24L04 is even smaller, 4 x 4 x 0.85 mm.

 

8 x 8 x 1mm is the size of the chip. What are you going to do with it once you get it in your hand?
If you want to play that game, nRF24L04 is even smaller, 4 x 4 x 0.85 mm.

Yes but breaking out the nRF24L04 and developing a whole antenna for it and everything else the ISP1507 has integrated would be much harder and not worth it. the ISP1507 is the most user friendly version of the chip that I can fit into the dimensions I need.

 

transmitting information over long distance is not easy. you may as well wish to hand throw a rock or paper plane that will go 40km.

you can use wired connection. this would be the easiest and needed devices would be the smallest.

you can use laser. both sender and receiver would need to be in line of sight and carefully aligned.
may be easier using optic cable - at least you would get some mobility that laser did not provide.

you can use wireless. but you need to be aware of range. using nRF24L04 you get maybe 800m so to cover 40km, you would need repeater. then your wearable transmitter can be small, and repeater can be something large, it does not matter since it is not part that is worn. but it need to be within range of the small transmitter. if you wand to use wireless you need to in compliance with standards, to get long range from something small and low power you need directional antennas. not very practical for wearable (think satellite dish or Yagi antenna).

you can use something with GSM modem but both sender and receiver will need to be in the area that has mobile coverage. if those 40km are in the middle of nowhere, this will not work.

so if you are serious about this you better get some serious effort in defining constraints. "20mm cylinder" is not a size. it is one dimension only. you can use 20mm rod that is 40km long. soft of ultra long cane... if you can move it, the other side can detect this...

 

transmitting information over long distance is not easy.

He has said multiple times that the the long distance comm is via cellphones and the wearables connect to the phones with bluetooth.

 

my apologies....