Any electronic hobby kit junkie out there ? How do I create a wireless countdownt timer below $100 prototype ?
Push button is pressed , countdown timer on LED panel starts with audible number count speaker. Can I get both the speaker & the LED timer display panel linked from the push button by wireless technology ? Distance of 20metres from each other. I know Sim Lim & Rochor Centre sells the ready made hobby kit but they are all wired. Can anybody advice on how I can get it to be wireless yet wont blow my budget? Im working on a WITS project below SD$100. Thanks 
PS: Bluetooth, Radio or Infra red ????
Well you say that you can already find the ready made wired version so all you have to do is make that wireless, which should be an easy task. I wouldn't use IR if it's going to be used outside, i.e. for model rocket launches or something as the bright ambient light and the sun would do a good job of blocking your remote signal. Bluetooth is more complicated than what you need. You only need to send a single push button signal. Radio is the way to go. Here's an example of a unit that'd do the trick:
http://www.electronickits.com/remote_control/rf2.htm
It's $30, but I'm sure you could do it cheaper by going to your local thrift/second hand store and finding an R/C car, ripping the receiver and servo out of it and using that to trigger a switch with the remote.
Roomba Red with Airsoft Gun
 |
 Handsfree Wireless Red Wht bluetooth Headset w Charger  US $11.62
|
 NEW NoiseHush Wireless Bluetooth Headset N500 Black w Red US $22.50
|
 |
Peltor M2RX7A Alert AM/FM Radio Headset
List Price:  |
 |
Sennheiser Set 50 TV Wireless Mono Assistive TV Listening System
List Price: |
 |
Polar IrDA USB Adapter Interface
List Price: |
 |
PictureSound BT Ultimate Bluetooth Car Fm Transmitter with USB port support,Sd-card support (16gb *),line support for MP4/WMA/MP3 (iPhone 4, 3Gs & 3G, iPod, Zune)
|
 |
Motorola MOTOROKR S9 Bluetooth Active Headphones (Red,Black) [Retail Packaging]
List Price: |
 |
Dell Inspiron Duo Convertible Tablet with Intel Dual Core 1.5GHz, 10.1" Multi-touch Screen with WebCam, 2GB DDR3 Memory, 320GB Hard Drive, Windows 7 Home Premium
List Price: |
 |
iSuper iHeli-007-Y Helicopter Controlled by iPhone/iPad/iPod Touch (Small Yellow Model)
List Price: |
 |
SD/MMC/USB/MP3 Wireless In Car FM Transmitter with Remote (Black)
List Price: |
 |
XO Vision IR620 Universal IR Wireless Foldable Headphones for In-Car Video Listening
List Price: |
 |
Jabra FREEWAY Bluetooth Speakerphone (Black, Retail Packaging)
List Price: |
Comments