The kit is a low cost counter, counting from 0000 to 9,999 or down from 9,999 to 0000. The overflow output pulses low when the count wraps to zero; so, two counters could be connected together to make an eight digit counter.
The clock input is debounced to prevent problems when using external mechanical switches. Operation on anywhere from 9 to 15 volts DC and 20 to 40 mA (depends upon how many display segments are lighted).
The AT90s1200 is preprogrammed; builder is not required to program anything. There are five pairs of pins for external connections: RESET, CLOCK, DOWN, DISABLE, OVERFLOW. A Down connections sets the unit to count down. A Disable prevents counting at all; Resets sets the counter at zero (0000), Overflow outputs a pulse low when the counter reaches 0000. The Clock contact will pulse a count, and each time a switch connected to Clock is on the unit increments a digit.
The maximum speed of counting is a bit more than thirty (30) per second. The display is red LED digital 0.6" high.
We suggest you also order a soldering tool kit to make this project. Click here to go to this item (# S540).
Click Here For Picture Of Soldering Kit # S540.