Explain your Rube Goldberg project by mentioning what your
input data, what you did, and what your output data were.
- Inputs: Dominoes, 120VAC, 5V, 10V, 5V "Fixed",
- What I did: In my Rube Goldberg circuit, It begins with a set of dominoes being triggered by the previous groups circuit, a domino then falls onto a rocker light-switch which allows power to flow through a 120VAC power strip, to power a heat gun with a pre-set mechanical switch. This heat gun powers a temperature sensor with a 5V power source.
- This hooked up to a LM324 Non-Inverting Operational Amplifier, the voltage gain [ Av = 1 + (2000Ω / 274Ω) ] = 8.3V. The op-amp requires a voltage supply equal or greater than the gain, so it’s (V+) is 10V.
- The output from the Op-Amp then flows into (pin 2) of a relay, by heating up the temperature sensor it will trigger the relay within a few seconds. (Pin 1) has a 5V "fixed" power source to ensure that enough voltage and current is supplied to components after the relay.
The relay then triggers a 555 timer, attached to a 74192 Decimal Counter, and then a 7447 Display Driver, which finally displays a number that counts up from 0 to 9. The D output form the 74192 will be 1 and give a voltage of about (1 - 1.5)V which is not enough to power a motor, especially with an amperage of 0.04A.
- So I used another Op-Amp and Relay with an additional separate power supply to power the motor when the voltage spikes at 9 seconds.
- At 9 seconds a motor will impulsively begin to spin, and it will pull a toy car across the table using a string, the toy car will have a 5V wire taped to it and will hopefully run into a metal wire ball that i have set up. This 5V connection will help power my partner Justin's circuit.
- Outputs: Toy car that carry's 5V wire attached to it.
Drawings and sketches are expected to be drawn in CAD (MS Word, MS PowerPoint, or any drawing software). Both technical circuit drawing and mechanical part drawing are required. Photos of your RG setup are also required.
Draw the circuit
schematic and list the parts you used with detailed explanations.
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| A final sketch of Liam's Rube Goldberg Schematic. |
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| Final Version of Liam's Rube Goldberg Block Diagram. |
- Temperature sensor
- 2 Op-Amps
- 2 Relays
- 1N4001 Diode
- 555 Timer
- 74192 Decimal Counter
- 7447 Display Driver
- 7 Segment Display
- XOR Gate
- LED
- Motor
List 2 main challenges/road blocks during the project and provide enough details how you solved them.
- Getting my timer to work correctly was difficult because I didn't know that i had to use more current than what my circuit was being provided. I was able to solve this by troubleshooting using the multimeter, and modified an old phone charger to provide the extra power our circuit required.
- Another issue that i had was getting my 555 timer to work correctly, in an event where i was using a potentiometer to see how resistance affected the counting rate of the timer, the current would sometimes flow backwards and cause the relay to switch back to pin 3, rather than stay at 4. To solve this I used a 1N4001 diode to assure that the current only flowed in one direction.
Provide at least 1 detailed comments on 2 other RG groups by talking to them about their setup.
