I am looking to broadcast a simple signal "yes/no" to a large area (1Km radius).
"Yes" could be represented by presence of signal.
The signal needs to travel on a non regulated band (ISM), transmit up to 1 watt.
I looked into different Radio front ends, but I am interested for something simpler, no need to serialize bytes over the air, just carrier detect the frequency.
What kind of circuit should I study, that can be easily incorporated into a toy?
Cheap, Simple, Small are the main circuit design requirements (excluding the antenna), battery lifetime is important but not critical.
Please send me pointers to start studying.
"Yes" could be represented by presence of signal.
The signal needs to travel on a non regulated band (ISM), transmit up to 1 watt.
I looked into different Radio front ends, but I am interested for something simpler, no need to serialize bytes over the air, just carrier detect the frequency.
What kind of circuit should I study, that can be easily incorporated into a toy?
Cheap, Simple, Small are the main circuit design requirements (excluding the antenna), battery lifetime is important but not critical.
Please send me pointers to start studying.