This circuit energizes the relay repeatedly – at regular intervals. The length of the intervals depends on the setting of R4 – and the output pin to which the “Range” wire is connected. With the range wire connected to pin 3 – intervals of up to 24-hours are available. If you need longer than 24-hours – increase the value of C3.
Say goodbye to the green elephant and hello to Pi!
Here is a guide on setting up a Raspberry Pi as your private online note keeper. Say goodbye to the green elephant and hello to Pi! Since storing notes only needs a bit storage and you need the note keeper service to be available 24/7 the Raspberry Pi is perfectly suited for this job.
This circuit uses digital circuits such as a demultiplexer and a binary counter to create patterns of “moving” led lights. This basic circuit is really cool when used in the dark or to light up a sign of some sort, as it creates a cool pattern that catches the eye.