Ripple Counter
An asynchronous (ripple) counter is a single JK-type flip-flop,
with its J (data) input fed from its own inverted output. This circuit
can store one bit, and hence can count from zero to one before it
overflows (starts over from 0). This counter will increment once for
every clock cycle and takes two clock cycles to overflow, so every cycle
it will alternate between a transition from 0 to 1 and a transition
from 1 to 0. Notice that this creates a new clock with a 50% duty cycle at exactly half the frequency of the input clock.
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Humidity meter, controller, digital counter, data logger