Hi guys, happy new year!
Hope you can help me out on this one: I'm fairly basic when it comes to Arduino and I try to set up some home automation system just for fun. The plan is to use a Raspberry Pi as a webserver from which I can control lights/heating/etc.
The following problem got me stuck, but before I'm going to give up, I want to take the chance to ask you expert guys:
I bought these really cheap 433mhz receiver/transmitter kits from China. I made a setup where one Arduino would send a command using the VirtualWire library to another Arduino which then switches a relay (so basically it's just a remote switch). In my testing environment this worked perfectly, I was able to send/receive and then switch the relay, so I tried to build it in a small box and solder this all together. That didn't work and after some testing, it seems that the receiver only wants to receive data on some power-supplies. I bought some cheap 5v usb power-supplies because I didn't want it to cost way more than a regular remote-switch system that you can find in stores, but these cheap power-supplies seem to give problems.
After some testing I found out that my iPhone charger worked great, some other USB charger did work sometimes (it received a signal only half of the time) and some chargers (the more cheap ones) didn't catch a signal at all. The Arduino boards will show that they're powered, relays switches on startup, but don't do anything when I try to send a signal.
I've found some information about noisy power-supplies which maybe distort the receivers, but I'm not sure if that applies to this case and if I can do something to help that (found something about decoupling capacitors?).
Is this a common problem or does someone has had similar experiences? Is there a way to be able to use the cheaper power supplies?
Thanks a lot guys,