PurpleTentacle wrote:I am also working on connecting a DCF77 receiver to my monochron. I would prefer not to add an extra microcontroller (ATTiny-idea) to the clock.
PurpleTentacle wrote:The pins PB4 and PB5 are not free. They are connected to the display.
PurpleTentacle wrote:The RXD (PD0) and TXD (PD1) pins can be very useful for sending/receiving debug messages to/from a PC. I would not use them for anything else, if possible.
PurpleTentacle wrote:The Pin PC1 is free and can be used to connect the receiver. It is not an interrupt-pin so you have to poll.
PurpleTentacle wrote:Have you thougt of which timer you want to use? As all three timers are in use, i think i will do the polling in the interrupt function of timer 0, which is called once every millisecond.
PurpleTentacle wrote:If you still plan to use a second microcontroller, you should pick one with SPI. This makes serial communication to the main microcontroller a lot easier. In my opinion, ISP is also a must-have. Maybe you can use something like an ATTiny48. If you are searching for examples how to evaluate the serial data
on the main microcontroller, you can take a look at the code of the GPS-mod.
PurpleTentacle wrote:I've now connected a DCF77 receiver to pin PC1 of my monochron and it works fine!
PurpleTentacle wrote:@Stefan: It may be possible to connect your external DCF receiver to the clock in the same way, but you will probably have to modify the case to get it wired.
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