Hello again, I asked a few questions about multiple SERINs on one pin at http://www.picaxeforum.co.uk/showthread.php?t=7139 For those who don't want to read that thread, I have an 08M listening to serial data via a 433MHz wireless module. The remote transmitter sends one byte every ten seconds or so. To prevent the 08M hanging I also have a second 08M acting as a watchdog, sending a dummy serial byte if it isn't reset by the first, master 08M, after about 60 seconds.
Now the above configuration works 100% reliably on the breadboard, with the remote module connected via a cable, ie. omitting the "wireless" part of the link... so two inputs from two PICaxes is fine, but one input from a PICaxe and one from a wireless module doesn't work. Either one works on its own (so I know the wireless connection is solid)
Both inputs are the same n300 data, with identical qualifiers etc (both of them work fine when hard-wired to the master PICaxe) Could there be an issue with the wireless module and the PICaxe giving different amplitude signals, or noise from the wireless RX drowning out the serial output of the watchdog? Have any of the wireless gurus had a similar problem? The serial sources are isolated from each other using the diode network suggested in the above thread, this aspect at least I did get to work!
Finally, has anyone tried isolating the watchdog's output with a transistor, and only "switching it in" when it is required, ie the watchdog is not connected to the master PICaxe except when it is sending its dummy serial byte.
I hope that makes sense to everyone, please let me know if I can clarify anything.
Now the above configuration works 100% reliably on the breadboard, with the remote module connected via a cable, ie. omitting the "wireless" part of the link... so two inputs from two PICaxes is fine, but one input from a PICaxe and one from a wireless module doesn't work. Either one works on its own (so I know the wireless connection is solid)
Both inputs are the same n300 data, with identical qualifiers etc (both of them work fine when hard-wired to the master PICaxe) Could there be an issue with the wireless module and the PICaxe giving different amplitude signals, or noise from the wireless RX drowning out the serial output of the watchdog? Have any of the wireless gurus had a similar problem? The serial sources are isolated from each other using the diode network suggested in the above thread, this aspect at least I did get to work!
Finally, has anyone tried isolating the watchdog's output with a transistor, and only "switching it in" when it is required, ie the watchdog is not connected to the master PICaxe except when it is sending its dummy serial byte.
I hope that makes sense to everyone, please let me know if I can clarify anything.