Hi I need a timer to operate a relay which will activate a Ham Radio WSPR beacon transmitter.
The requirements are that I need the realay to operate momentarily exactly at the start of every fourth minute and only on even numbered minutes so, 10:02/10:06/10:10.....etc.
So,just need some start off help with this. If I add an RTC to my Arduino, can I somehow interrogate the output of that to test for an even mintue and to test for a 4 minute pass? Maybe there's a better way to do this....
Thanks for any guidance folks