Rf module with one arduino - Tutorial: 433 MHz RF Modules for Arduino - Cooking
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RF network using Arduino. connected via i2c in each slave module. One arduino will be busy controlling the lightssensors. Other one will take care of RF.
How to connect 20 wireless sensors in one (rf 433mhz usually one main door and several others, so I can't have one arduino in each place or run down then wall.
RF Link Sender 434MHz. 4, 34 EUR. they will only work communicating data oneway, Color may be blue or green, but they are the same module. Features: 434 MHz
MHz Transmitterreceiver Module and Arduino send a Data from One Master.
MHz RF module with Arduino a remote control RF signal. Maybe there is room for one more module with Arduino Tutorial 1; Relay Module.