Week 13: Rube Goldberg Finalization
Problem 2: A Trebuchet launches a ball into a cup, which covers a photoresistor. This in turn increases the output of a transistor, which has it's output amplified by an non-inverted op-amp. If the photoresistor is covered, then a relay is switched, turning on a clock (555 Timer.) This clock's pulses are measured and counted by the 74193 Binary Decimal Counter. This chip then outputs the count into 4 bits of binary. The binary bits are connected each to a 7 segment display. When all the displays are lit up (all binary bits are at 1,) then the clock's pulses are blocked from the Decimal Counter via a relay that shorts the wire between the two. This produces a constant signal for the next Rube Goldberg part.
|Circuit implemented on bread board.|
Some failures were due to inaccuracy of the trebuchet, this was solved with making a large enough target that missing is improbable. Another issue was inconsistent results when trying to use logic gates such as NOR to make flip-flop designs. This was solved by simplifying the design and using NAND gates instead.