How to implement the relay switching times per day?

The bottom line is this, alternately running pumps should switch once a day(one off of the other involved), but the catch is that the Board is not connected neither to PC nor to the Internet to know the time, I am so confused
March 12th 20 at 08:04
3 answers
March 12th 20 at 08:06
Solution
Well, if you really want to learn to do, then buy the sensor real-time (e.g. DS1307), relays, and code accordingly write to MK took time from the sensor and every 24 hours switched relay. But in General it will be the farm, better to do without the MC, as described above.
March 12th 20 at 08:08
And what prevents a fee to put your own watch? And if the task Board is only switching the pumps, and the microcontroller is not required, only the clock and bistable relays.
I understand the accuracy of the watches even very interested. our purpose is to distribute the load on the duplicated items ?? - skye66 commented on March 12th 20 at 08:11
March 12th 20 at 08:10
For this task, even the microcontroller is not needed.
To buy any ehlektromagazin mechanical timer sockets and changeover contactor (really dial them just for a day, switching the 12h of pumps even better)
The author in adjacent question asked about "the indication of the water flow", so in addition to the timer there is still the emergency switch means, here is the easy PLC or microcontroller, the timer just a little. - ottis_Grimes38 commented on March 12th 20 at 08:13

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