Hello. I have a problem with communication between RF modules (FS1000A) and RadioHead library.
When receiver and transmitter placed near to each other (3-5 cm), it works. Large distance does not allow to transmit. I checked signal on receiver (when transmitter disabled), and I saw that voltage randomly changes from 0 to 3.7 v. I connect antennas to both modules (it's length about 17 cm). How to solve my problem?
Hi, the transmitters will take up to 12V on the VCC line, using greater than 5V on the VCC pin on your transmitter will increase range.
I used them on my own project but have since started using the nRF24L01 transceivers as they work on 5V and you don't need to solder antennae (mine came with rubber antennae).
I have slightly different 433 MHz modules than yours
and they work from one end of my home to the other.
I run the transmitter module at 3.3V (that is the spec according to the seller) and the receiver module at 5V with the ~17 cm antennas.
I checked signal on receiver (when transmitter disabled), and I saw that voltage randomly changes from 0 to 3.7 v.
Are you giving the receiver 5V? You should see random noise between 0 and 5V. The receiver may not run on less than 5V.
Check again when the transmitter is enabled and you are sending something using RadioHead, and let us know what you see.