For our Rube Goldberg project we visioned using the circuit setup with a fan to push over the dominoes to create the effect to hit a ball. This ball would then roll down a tube to hit more dominoes to fall further and eventually end at a ball to knock over a set of blocks. After setting everything up we had to eliminate a few things as it was hard to recreate the exact setup we had planned. Our problems throughout the week started with getting the circuit to act how we wanted. Originally we wanted the digital part of the circuit with an OR gate to power the temperature sensor to power the op amp and the relay to start our motor. After spending a lot of time on the circuit, it was finally realized that we had the wrong op amp to make the relay work properly. This was realized the night before and had to rush to get the right op amp resistors correct to increase the temperature on the sensor that starts at around .7 volts to be amplified to the 5.5 volt range to switch the relay. The presentation didn't go as planned for the dominoes as our ball completely bounced over the dominoes. The circuit itself worked as planned until the dominoes didn't apply enough force on the resistor.