Those only do one way communication. The smaller one is the transmitter and even though the bigger one has two data pins, only one is needed.
Also make sure the receiver is getting 5 volts and not 3.3.
Those only do one way communication. The smaller one is the transmitter and even though the bigger one has two data pins, only one is needed.
Also make sure the receiver is getting 5 volts and not 3.3.