I am trying to improve 433mhz remote control reception.
I am using the RCSwitch library.
I am using arduino nano.
I am using a superheterodyne receiver.
I am using generic 433mhz remote control with 4 buttons
I notice a few things:
- the spring antennas (I tried 2 types) makes basically no difference to no antenna at all.
- Despite what I read on the forum, I ran receiver at both 3.3 and 5v and there is no range difference
- the 12v battery in the transmitter, as it gets weaker to 11 volts or less, the range decreases
- I can get signals of 30ft or more but not in all remote orientations, its possible to hold the remote at certain angles and it won't work even at 10-12 ft., but less than 10ft it always works.
- adding a 17cm wire antenna did not help, but adding a 17cm wire to both ground and antenna pin DOES help. I need both wires, and the signal definitely works about 50% further and more orientations. I can use a spring antenna on ground, or a bent wire on the ground, but the antenna wire needs to be straight 17cm to get the improvement. In either case it still does not reliably work in all orientations of the remote control especially around 20ft distance or more.
What can I do to improve reception? Should I try a different software or antenna. Any insight appreciated.