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September 20, 2011
about 5 years ago
As long as the phone battery doesn't have some kind of protection circuit that forces it to use a "known" charger (don't know how common this is, if it even exists :D), I don't see any problems with using this. Can't stress this enough though, Li-Ion and Li-Poly are very dangerous, even if you know what you're doing.
Check below about the third pin.
Most camera and phone-batteries are single-cell (3.7 volt) and the third pin (often in the middle if I'm not mistaken) is for either 1-wire communication or internal temperature sensor.
about 8 years ago
I just assumed you used the VirtualWire-library of Arduino, do you? :P
Both versions of Uno have a 16MHz oscillator so thats not the problem. But if you were to use lets say a LilyPad or 3.3V Pro Mini on one side, it uses 8MHz oscillator and the timing would be all wrong. If you use the VirtualWire-library that is :)
Follow this guide http://www.open.com.au/mikem/arduino/VirtualWire.pdf examples included
I don't experience any of the problems you describe. Sure 433 is an open frequency and subject to a lot of noise and other transmitting devices but it seems strange if you only get one out of 20. I transmit data (70 bytes four times a second) about 25m with antenna only on the receiver and in a couple of days I have maybe 2-3% loss.
Of course there's a lot of environmental parameters to take into account here. You don't explain how your setup is but mine is an ATtiny85 programmed via an Arduino Uno with VirtualWire as transmitter and an Arduino Mega 2560 as the receiver and as stated before, it works fine.
Make sure that both Arduinos run at the same frequency (if you're using a 8MHz as transmitter and 16MHz as receiver you must compensate for this in the code)
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