I need a device about the size of a phone with 2 buttons, the device will be used to let a server know the outcome of an event (2 possible outcomes). A mobile phone app would be the obvious choice but I want to reduce the latency as much as possible and it also needs to be more reliable than mobile internet.

I was thinking that it might be possible to create a device that sends the outcome by a radio transmitter to a receiver connected to a computer up to a 1km away with a fibre optic internet connection.

the device would need to operate for several hours.

is this realistic? how much knowledge and skill would be needed to create something like this?


  • \$\begingroup\$ Just google "1km wireless transmitter". It gave me some decent results. \$\endgroup\$ – Eugene Sh. Jul 30 '15 at 19:51

This transmitter/receiver pair, from Electronics-DIY.com, transmits data up to 4800 baud at 433 MHz. The manufacturer claims a range of 1 km. Cost is very reasonable, $10 for both modules.

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The receiver current consumption is 5 mA. The transmitter consumption varies between 5 mA and 45 mA, obviously the latter when it is actively transmitting. With a couple of AA cells, using a boot regulator to boost the battery voltage up to 12V (for maximum transmit range), you should be able to get 6 to 7 hours of life out of one set of batteries on the transmit side, and much longer on the receive side (which runs on 5V).


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