Monday, February 27, 2017

Blog Report Week 8

Draw and explain a Rube Goldberg design that will include the following components:

- Digital
- Motor
- Relay
- Opamp
- Temperature sensor

The setup should be considered to last 30 seconds.

Video 1: Rube Goldberg Explained

Video 2: Rube Goldberg in action

  • Clearly in our circuit the relay was giving us a hard time. Other than that the circuit pretty much functioned according to plan. We showed the increasing voltage that was coming from the op-amp and into the relay to help viewers understand the circuit better. When the mechanism fell over, the slight bounce is just enough to release pressure on the switch. This is why there are random weight blocks on the back side and ultimately why I ended up pressing on the mechanism in the video. 

Make sure to include enough photos, videos, and explanations for each “transition” or step. Explain your circuits.

Photo 1: Shows the motor attached to the falling mechanism
that will trigger the 7 segment display to turn on

Photo 2: Overview of the 7 segment display, op-amp, and relay

Photo 3: Shows 555 timer

Photo 4: A closer view of the heat sensor, op-amp, and relay

Photo 5: Showing the connections made in order to produce
the number 3 on the 7 segment display

The following pictures are schematics of our Rube Goldberg's components layout

Schematic 1: Is a block diagram of our Rube Goldberg circuit

Schematic 2: Is part one of our Rube Goldberg Circuit

Schematic 3: Is part two of our Rube Goldberg Circuit

Put at least 2 issues/problems/struggles you faced during the project.

  • Problem 1: One problem that we encountered during this Rube Goldberg build was getting the gain on the op-amp to be just right. Instead of using two resistors, we ended up having to use three because we couldn't find one resistor to be precise enough. I am forgetful of the two values that we put in series to make this happen, but it worked nonetheless. 

  • Problem 2: Another problem that we faced during this build was getting everything to work correctly at the end of it. As you can see in the video, the falling mechanism we built did not have enough weight to trigger the switch on the bottom side. This is why you can see me push down on it to light up our group number. The motor was also very weak and we had little supplies available to attach to it.