Sunday, April 10, 2016

week 12

Week 12

Stocker Rube Goldberg

     Parts Used

  • Seven Segment Display
  • LM324 Op Amp
  • Relay
  • Transistor 
  • Motor
  • Resistors: Various Ohm Values
  • Dominoes

Rube Goldberg Plan

      The setup I have chosen to use consists of seven segment displays, a relay, op amp, transistor, motor and dominoes. The plan is to get voltage from my partner next to me to flip the relay. I haven't figured out how I will get my voltage to start from his rube goldberg. I was thinking of using a solar panel like the project in front of me who I will have to connect with. From there it will light up the seven segment displays and go into the op amp. I plan on having around 1 volts go into the op amp and around 10 come out by using resistors to get a gain of 10. From the output of the op amp it will be sent to the transistor to power the motor. The motor will be used to spin and hit the first domino to create a domino effect. I will have the dominoes go up and over the desk to fall down to the other side. The person I will be connecting with will be using a solar panel and will have it covered by a sheet of paper. With the dominoes I will be able to pull off the sheet to get his circuit going. In my video it isn't exactly ten seconds because my second set of dominoes are two hours away and I wasn't fully able to get it to the time limit. Once I get my second set of dominoes I will be able to add a longer setup.









video

video

Failures

       When it comes to using dominoes it is very easy to fail and knock them over. It happened to me a few times and also when the dominoes had to fall off the edge shown in my first video, the domino path didn't continue. Other failures involved the circuit with not putting in the correct resistor values to create the desired gain for the op amp. Also the resistor values for the transistor were off making the motor spin very slow and not hitting the domino over. 



                              

9 comments:

  1. David, I hope your dominos will work fine. Your circuit is very similar (if not the same) as some of our labs. I like 7 segment saying hello but you might want to find a way to maybe trigger in a different way? Also, this part is not included in your drawing.

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    1. Okay I can try to change it up. Today I had to add a relay and a solar panel so that changes it up some. I can update the picture

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  2. I like the way you made the displays show "Hello". That was cool. What do you think you'll do to make sure the dominos fall correctly over the desk? -Matt

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    1. I will just have to be prepared early and have the dominoes very close and just put a bunch on the other side for the fall to make sure it works.

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  3. I like your setup, and I always enjoy watching dominoes tumble over. How do you connect the dominoes on different levels? Is it just connected by string taped to each corresponding domino? If so does the tape hold? For my transistor I ended up using a very small (87 ohm) resistor for the collector and no resistor between my OpAmp and base, this gave me enough voltage to get my motor to run.

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    1. I connected the dominoes with a string thats super glued to it to make sure it doesn't come off and seems to work every time. I had to add additions to my circuit to get the voltage from nick by using a sensor going to the op amp that will switch over the relay. From there the motor will start.

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  4. I like the setup, nice idea to use the string glued to the dominoes to do the level change.

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  5. Hey David, I think the 7 segment display is unique since no one has really done anything with them other than counting or displaying single letters. I have a suggestion for you input to your RB setup. If you do not know how you will get a voltage from the previous person you could always use a senor of some sort to trigger the start of yours. I think these are great ways to transition and make the entire setup interesting. If we all just had a power incoming from the previous circuit it would seem like we just have a bunch of circuits connected together without the mechanical movements.

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  6. Hopefully your dominoes work out okay! Maybe use a strain gauge or something for the voltage? Why not just connect it to the function generator or the power supply?

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