Liam's circuit will begin with Dominoes falling onto a light switch and turning a heat gun on, to heat a temperature sensor. Next it will start a timer, counting until it reaches 9 seconds, and then spinning a motor with a string glued to a car (to act like a pulley system). The car will have a 5V wire attached to it and will begin Justin's Circuit.
Justin's circuit will begin with a 5V connection from Liam's circuit. This will spin a motor that pulls a stop block and releases a ball down a system of ramps. The ball will trigger a switch that sends power through an op amp, a relay, and into a timer. This will be connected to a binary counter. The least and most significant bits will be connected to an and gate which is then connected to a motor that will pull a paper off of the next group's circuit.
7. Group task: Video of a test run of your group RG.
1. Provide the updated computer drawing for your individual RG setup.
Block Diagram for Week 13 Rube Goldberg.
An updated circuit schematic for Week 13 Rube Goldberg.
2. Explain your setup.
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.
3. Provide photos of the circuit and setup.
Photo 1: My initial 120V AC power supply which
has a switch that will be triggered by a domino,
and then power a heat gun.
Photo 2: A separate 12V 16A power supply.
Photo 3: An angle to show where everything is at.
Photo 4: Showing my motor from birds eye view.
Photo 5: A side view of my circuits components.
Photo 5: Showing my components
and their wiring.
Photo 6: The motor will pull this car with
a 5V wire to trigger Justin's circuit.
4. Provide at least 2 new videos of your setup in action, one being a failed attempt.
Video 1: Updated Rube Goldberg Week 13 - Fail
Video 2: Updated Rube Goldberg Week 13 - Success
5. What failures did you have? How did you overcome them?
One of the failures I had when making this circuit was trying to figure out how to get the 7-Segment-Display and all of its components to work properly with each other. I was able to overcome it by putting in long hours and having the tools and resources available to improvise solutions to get the counter working. For some odd reason my temperature sensor was grounded on pin 2 instead of pin 3, everything else was working somewhat correctly.
Another Failure of mine was getting the motor to trigger once the 7-Segment display reached the number 9 in the circuit. I was able to overcome this by using a separate power supply hooked up to a relay that was attached to an op-amp.
1. Provide the updated computer drawing for your individual RG setup.
Figure 1: This is a basic schematic of my circuit. It excludes things such as power to components and some ground.
2. Explain your setup. Power will come to my setup in the form of a 5V pulse of electricity. This 5V will be directly connected to my motor. This motor will pull the stopping block in front of my ball, which will allow it to fall down the setup. The ball will land on a switch and activate it. This will allow 5V to run through the op-amp, increase to 7V, and trigger the relay. The relay will send voltage to an LED to start the next circuit while also powering a 555 timer that's 1st and 4th output will be hooked up to an AND gate. When this triggers, the LED will have power.
3. Provide photos of the circuit and setup.
Figure 2: An overview of my circuit on the breadboard so far.
Figure 3: The top view of my catching component.
Figure 4: The underside of my catching component that shows the switch.
Figure 5: A picture of the ramp system that I have built for the ball to travel down.
Figure 6: A close up picture of the motor on my mechanical component that will pull the stop block and allow the ball to roll down the ramp system.
4. Provide at least 2 new videos of your setup in action, one being a failed attempt.
Video 1: This is a failed attempt.
Video 2: This is a partially successful attempt.
Video 3: This is a successful attempt
5. What failures did you have? How did you overcome them? One of the main failures that I faced was getting the mechanical component to successfully land inside of the catching mechanism that I had built. I tried to overcome this by taping the component onto the table to prevent the small movements between attempts. At first I had trouble getting the relay to trigger when I wanted it to, but I solved this by playing with the resistor values on my op amp until I could get it to work. I also have trouble will getting the ball to start rolling. It is not perfectly round so sometimes when the stop block is released, the ball remains there.
