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It's easy. It is one pulse every 2 minutes or 120 seconds
32.768 kHz
Divide by 2^15 (32,768)
Divide by 60
Divide by 2
That can be done with standard ICs, but it is less wiring with a PIC
It's been a long time since I've used that chip. It really depends on the crystal type and cut. Overtone SC cut crystals can't be tuned very far off. AT cut crystals can be pulled further off than SC cut crystals.
What will?????
Thank You eric, I'm not that good in electronic, but I try, How would i hookup the4049? also I need a relay to be triged.???
You calculate the period of a signal by taking the inverse of the frequency. So a 100hz waveform takes 1/100 of a second to repeat itself. A 60hz waveform takes 1/60 of a second to repeat itself, etc. You need a 30 minute period (15 on & 15 off) which is 30 x 60 = 1800 seconds long. The period of 32768hz is 30.5176 microseconds long, so 1800/0.0000305176 = 58982400 which is the divide ratio you'd need.How do you get those numbers on the, I don't understand how to fig. the times????