Pages: [1]   Go Down
Author Topic: Smallest wireless transmitter?  (Read 1426 times)
0 Members and 1 Guest are viewing this topic.
0
Offline Offline
Newbie
*
Karma: 0
Posts: 42
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I need an extremely small wireless transmitter that can connect to an arduino or something smaller. The signal only needs to travel about a meter and the size of the receiver doesnt matter. Anyone know of anything?
Logged

the land of sun+snow
Offline Offline
Faraday Member
**
Karma: 149
Posts: 2790
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

http://www.hoperf.com/rf/fsk/21.htm
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 42
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

anything smaller?
Logged

0
Offline Offline
God Member
*****
Karma: 39
Posts: 986
Get Bitlash: http://bitlash.net
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

It might be worth considering infrared at that range, depending on the data rate you were hoping for.  The transmitter can be as simple as an LED + resistor.

-br
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 42
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

should be 5mm x 5mm at most
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 332
Posts: 16568
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

should be 5mm x 5mm at most

What kind of and amount of data do you need to send. Infrared transmitting can be very small for the transmitter part. Think how tiny the smallest LED you ever saw was.

 Lefty
Logged

Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

a transistor + a couple of caps + resistor + a wire = a transmitter;

an active crystal oscillator controlled by your mcu pin + a wire = a transmitter;

a mcu pin flipping fast and furious + a wire = a transmitter;

...
Logged

London
Offline Offline
Edison Member
*
Karma: 23
Posts: 1083
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

a transistor + a couple of caps + resistor + a wire = a transmitter;

an active crystal oscillator controlled by your mcu pin + a wire = a transmitter;

a mcu pin flipping fast and furious + a wire = a transmitter;

...


I need a very small receiver. I can go upto about 8mm by 8mm. I only need it to toggle a small 3v motor on or off when it receives a signal. I'm not too woried about the size of the transmitter. Although the receiver will be less than 10Mtrs from the transmitter, it won't be possible to use IR as the receiver will be hidden when in use. Any suggestions?
Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 446
Posts: 23872
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

These are pretty small for both Rx & Tx, built in antenna.
Not 8mm x 8mm small, but pair it up with an ATTiny perhaps to receive on/off command and control MOSFET to turn motor on/off.

http://www.mdfly.com/index.php?main_page=product_info&cPath=8_52&products_id=81
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

0
Offline Offline
Newbie
*
Karma: 0
Posts: 42
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

should be 5mm x 5mm at most

What kind of and amount of data do you need to send. Infrared transmitting can be very small for the transmitter part. Think how tiny the smallest LED you ever saw was.

 Lefty

Just need to send a button pushed signal but there cannot be any delay. Doesnt infrared have a bit of delay? At least according to my experience with TV remotes, or is that just the tuner being slow? If the is a delay it should be under 50ms in total
Logged

SW Scotland
Offline Offline
Edison Member
*
Karma: 13
Posts: 1327
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

At 1 metre range you don't need a transmitter on the remote device.
Assuming you want to "see" a circuit open or closed all you need is a tuned coil to act as your "transmitter". 
Your base receiver unit is actually a "grid-dip" device (now there's a term from the past`) which is tuned to the resonant frequency of the remote tuned circuit.  When the tuned circuit is open there is no absorption of the base signal but when the tuned circuit is closed there is absorption. 
Logged

Pages: [1]   Go Up
Jump to: