Monday, April 10, 2017

Blog 12 Abdullah Alramadhan

1. Provide the computer drawing for your individual RG setup.

fig. 1&2: RG circuit setup
2. Explain your setup.

In my Rube Goldberg set up I have the force sensing resistor connected to an Op Amp, when we give the FSR force the Op Amp the connect with the power and it will start a motor. The motor will pull weight to another FSR in the second circuit to connect the Relay. The Relay will start display to give number 9 “out group number”, also it will start motor to pull 
3. Provide photos of the circuit and setup. 

fig.3: the whole circuit
fig. 4 Relay part circuit
fig. 5: Op Amp circuit

4. Provide at least 2 videos of your setup in action (parts or whole), at least one being a failed attempt.

fig. 6&7: Circuits videos 

5. What failures did you have? How did you overcome them?

a- I had a failure with the Relay, its output wasn’t accurate and it could it start the motor. At the end, we found that the Relay wasn’t working. Everything goes well when we changed it.

b- The biggest failure I had that when I connect FSR to start Rely, the voltage dropped. I think I should some resistors or something else that can make the voltage and current constant. Until now I don’t solve this problem.


  1. Abdullah, you need a technical drawing of your mechanical part as well. Complication of the electrical and mechanical parts seem good.

  2. Abdullah your circuit seems complicated enough, both electronically and mechanically. However, it was very hard to to follow your explanation. I too am using a force sensor in my circuit and I am finding it to be somewhat hard to use effectively 100% of the time. Since you are using two of them, I hope they will work great for you. My advice is to tape them down when applicable.

  3. Abdullah, I like the mechanical side of your circuit a lot. The whole belt-driven gear system is really unique. It looks like you really spent a lot of time messing around with the 'evil' legos.
    I was going to use force sensors in the beginning however, it was too challenging to get them to be consistent. Make sure you use a heavy enough object to get them to output a low and consistent resistance.

  4. Nice job this week. your drawing for the circuit is really nice and easy to understand how it works. Also its cool that you used two separate motors with different tasks. I was thinking you could have probably powered the first motor with the first channel of the relay so then when it switched it would turn off. just a thought. Also your second motor was really cool looking, I'm interested to see it in person and learn more about it.

  5. Nice circuit I like the idea of a two part circuit where your mechanical part intersects your two circuits. Your description of the circuit was kinda of confusing. Also you may want to be careful when using a force resistor there resistance always seem to change a little bit every time you use them.

  6. i think your setup is very good and using two motors is a great idea the mechanical part seems too complicated, my advise is that using a photo sensor in the beginning is better than using the FSR because it needs more weight to make it work.

  7. Abdullah, I really like your circuit set up it looks complicated enough, using force is really better than using photo sensor, i tried to use photo sensor in the beginning but i struggled with so i changed to force sensor. For using force sensor, i think if you used resistors with it, it should work. Your mechanical contraption is unique, I hope it works.

  8. Abdullah, I really like your circuit, it provides a lot of good components. Did you have issues with your force sensors? They cause me to struggle quite a bit on them. They werent giving the output that I needed and i could not figure them out. Great job!

  9. I like the use of multiple motors in your circuit, as they are the literal definition of electronic input being converted into physical output. This allows for the naked eye to see what is going on in the circuit much more clearly.