2.4 GHz versus 434 MHz transceiver for home automation


I am working on a project that uses an Arduino Uno R3 and will have one receiver and one transmitter. I'm going to use this for home automation within my home in India. I want to know which transceiver would be better, a 2.4 GHz or 434 MHz module? My requirement is a 100 meter range.

Also, I would like to know if I can use an ATTiny along with the transmitter?

Best Answer

In my (short) experience, 434MHz (or even 915MHz) would be much better getting through obstacles than 2.4GHz.

Please mind that an obstaculized 100 meter range is quite large for the usual hobbist module. Also, antenna directionality is important: if the antenna is omnidirectional you might be radiating power to directions you don't need, so take that into account for your link budget.