Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

infra red system for remote voting

Status
Not open for further replies.

defnfo

Member level 3
Joined
Jun 11, 2003
Messages
65
Helped
11
Reputation
22
Reaction score
7
Trophy points
1,288
Activity points
453
hi
anybody knows how build infra red system for remote voting
or wireless
 

be more specific

What do you mean by voting? Do you mean the reliability method of several independent transmission paths with a majority comparison?
 


project details

100 people have 100 infra red remote system and voting
some YES! and another NO!
and PC recive the results
how mach YES and How much NO

thanks all
 

please view **broken link removed**
and if have any idea post me messages
 

problems to overcome

Here are some basic problems to overcome.

1. The transmitters are directional. You will need to have receptors in several locations.

2. The outputs yes/no of each unit have to be encoded differently so they are not counted twice.

3. The receptors can only handle one signal at a time. This leads to two things.
a. They have to be duty cycled to give time for the other transmissions.
b. It is important to have narrow beams so only one receptor gets the signal. There has to be decoding at the receptor.

4. The main computer needs to keep track of which transmissions never reach it.

This leads to the probability of radio links being better. There can be several frequencies. The receptor can transmit out a command for the senders that are received to stop transmitting. This makes sure all of the senders get counted.
 

INFRARED does't appear to be a good approach
100 people shooting to some direction . is not an elegant approach

Wireless is much better .. and in 2.4 giga herz is easy to implement
100 channels ..
 

two way ir

After thinking more about it, you could have the radio reverse link on the ir system. It could turn on groups of transmitters and after receiving each one turn it off and then turn the next group on. This will solve the collision problem.

Anther way is to poll the senders to turn on the IR transmitters and then off.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top