{"id":12706,"date":"2021-04-04T20:27:55","date_gmt":"2021-04-05T00:27:55","guid":{"rendered":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2021\/work\/?p=12706"},"modified":"2021-04-04T20:28:39","modified_gmt":"2021-04-05T00:28:39","slug":"clap-activated-light-switch","status":"publish","type":"post","link":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2021\/work\/clap-activated-light-switch\/","title":{"rendered":"Clap-Activated Light Switch"},"content":{"rendered":"

Overview<\/h2>\n

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I created a device that turns a light on and off whenever it hears you clap or snap, so I can turn off my light remotely.<\/p>\n

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GIF<\/p><\/div>\n

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Overall photo for proportion and scale<\/p><\/div>\n

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Detail photo of the electret microphone installment soldered to an internal breadboard<\/p><\/div>\n

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Image showing the use of my device. Once I snap or clap, it’s picked up by a small microphone and moves a motor.<\/p><\/div>\n

Process images and review<\/h2>\n

Below are some images of my pivot points. The first big issue I had to tackle was figuring out the mechanical setup o f my device. I knew I needed an actuator that moved linearly in some way so I could turn the switch on the wall off and on. After I knew the exact linear actuator I was ordering, I made some hypotheses. At first, I thought I needed to fashion a squarish attachment that would do the moving. You can see the sketch of it in my sketchbook, and next to it is the refined version that I ideated when I realized it I didn’t want to code the extra step of having the actuator return to\u00a0 neutral position after pushing the switch.<\/p>\n

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My beginning thoughts on how I would get my linear actuator to do what I wanted<\/p><\/div>\n

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The cardboard cutout I made to test out my original idea<\/p><\/div>\n

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After that, I measured out all the physical components I would need for my device, sketched it out to see how big of a box I would need to fit everything, then built a 3D model in Fusion 360.<\/p>\n

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measurement sketches<\/p><\/div>\n

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my Fusion 360 model<\/p><\/div>\n

When I started actually building the model, I realized I drastically overestimate the size of the hole in the actuator arm. It would not be able to hook the switch, so I just made it push the switch, measuring carefully in my Arduino Sketch the amount it needed to press down.<\/p>\n

Discussion<\/h2>\n

Response<\/strong><\/p>\n

During the crits, no had many critiques, but they asked good questions that I needed to consider:<\/p>\n

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  1. How does the linear actuator work?\n
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    1. At the time, I thought I had a pretty good idea, but I really didn’t. I figured that it works like a servo and I can just write to it to move to a certain position. I also thought it would be easy to wire, like one wire to power in and one to power out. Luckily, I got help from the course professor, Zach, who knew how that works. An L293D motor driver was key in the process.<\/li>\n<\/ol>\n<\/li>\n
    2. How will the device pick up sound?\n
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      1. The render I showed them in my crit actually had no microphone, so I’m glad they pointed that out so I could explain the concept more clearly.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n
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        parts were loose because I cut out 0.2mm of space that I did not need to cut out<\/p><\/div>\n

        Self critique<\/strong><\/p>\n

        I was satisfied that my device at least worked, but I did not have time to make it look as nice as i would had hoped. I wanted everything to be neatly encased in clear acrylic including the actuator.<\/p>\n

        What you learned<\/strong><\/p>\n

        I learned a lot about Fusion. I taught myself how to make finger joints, though I’m sure I used a method that could have been a lot easier. I learned how to prepare a 3D drawing for laser cutting. I learned how to bevel out the edges that I wanted to be curved as well. I realized that my panels would not fit together the way I designed them in Fusion, thanks to my laser-cut cardboard model.<\/p>\n

        Next steps<\/strong><\/p>\n

        A clap-activated light switch would actually be super useful to me, so I would like to iterate again. But the device would be right next to my door which I slam sometimes and that triggers the switch, so that would get annoying. If I were to iterate, I would make then enclosing fit together nicer and make it out of more long-lasting material. I would also attach a hook to the actuator to make it actually switch the light on and of all the way. Finally, I would fit everything in the enclosing so it can attach directly over the light switch, use adhesive so tape isn’t sticking out everywhere, and switch to a battery to power my Arduino so no wires are plugged into the wall. I actually had to unplug my Xbox for the device, so that is not ideal at all.<\/p>\n

        Technical information<\/h2>\n

        Schematic and block diagrams<\/strong><\/p>\n

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        block diagram<\/p><\/div>\n

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        schematic<\/p><\/div>\n

        Code submission<\/strong><\/p>\n

        \/****************************************\r\n * Clap-Activated Light Switch Sketch\r\n * Dominique Aruede\r\n * \r\n * Description:\r\n * This sketch moves an actuator to turn a light on and off whenever it hears\r\n * you clap or snap, so you can turn off your light remotely.\r\n\r\n  Pin mapping:\r\n  Arduino pin | type   | description\r\n  ------------|--------|-------------\r\n  A3           output   linear actuator\r\n  A4           output   linear actuator\r\n  A1            input   electret microphone\r\n\r\n  Collaboration and sources:\r\n  Example Sound Level Sketch for the\r\n  Adafruit Microphone Amplifier\r\n****************************************\/\r\n\r\nconst int LINEARARMPIN1 = A3;\r\nconst int LINEARARMPIN2 = A4;\r\nconst int MICPIN = A1;\r\nconst int WAIT = 1000;\r\nunsigned long timerVariable = 0;\r\nconst int sampleWindow = 50; \/\/ Sample window width in mS (50 mS = 20Hz)\r\nunsigned int sample;\r\nboolean toggle = 1;\r\n\r\nint micState = 0;\r\nint armState = HIGH;\r\n\r\nvoid setup()\r\n{\r\n  Serial.begin(9600);\r\n  pinMode(MICPIN, INPUT);\r\n  pinMode(LINEARARMPIN1, OUTPUT);\r\n  pinMode(LINEARARMPIN2, OUTPUT);\r\n}\r\n\r\n\r\nvoid loop()\r\n{\r\n  unsigned long startMillis = millis(); \/\/ Start of sample window\r\n  unsigned int peakToPeak = 0;   \/\/ peak-to-peak level\r\n  micState = peakToPeak;\r\n  armState = analogRead(LINEARARMPIN1);\r\n  timerVariable = millis();\r\n\r\n  unsigned int signalMax = 0;\r\n  unsigned int signalMin = 1024;\r\n\r\n  \/\/ collect data for 50 mS\r\n  while (millis() - startMillis < sampleWindow)\r\n  {\r\n    sample = analogRead(MICPIN);\r\n    if (sample < 1024)  \/\/ toss out spurious readings\r\n    {\r\n      if (sample > signalMax)\r\n      {\r\n        signalMax = sample;  \/\/ save just the max levels\r\n      }\r\n      else if (sample < signalMin)\r\n      {\r\n        signalMin = sample;  \/\/ save just the min levels\r\n      }\r\n    }\r\n  }\r\n  peakToPeak = signalMax - signalMin;  \/\/ max - min = peak-peak amplitude\r\n  double micState = (peakToPeak * 5.0) \/ 1024;  \/\/ convert to volts\r\n\r\n\/\/ if mic hears sound, move up or down depending on position of switch\r\n   if (micState > 2 && toggle == 0){\r\n    Serial.println(\"hey\");\r\n    \r\n    while (millis() - timerVariable < WAIT) {\r\n      digitalWrite(LINEARARMPIN1, HIGH);\r\n      digitalWrite(LINEARARMPIN2, LOW);\r\n      delay(1000);\r\n      toggle = !toggle;\r\n    }\r\n  }\r\n  if (micState > 3 && toggle == 1) {\r\n    Serial.println(\"whats up\");\r\n    \r\n    while (millis() - timerVariable < WAIT) {\r\n      digitalWrite(LINEARARMPIN1, LOW);\r\n      digitalWrite(LINEARARMPIN2, HIGH);\r\n      delay(1000);\r\n      toggle = !toggle;\r\n    }\r\n  }\r\n  \/\/  Serial.println(timerVariable);\r\n  digitalWrite(LINEARARMPIN1, LOW);\r\n  digitalWrite(LINEARARMPIN2, LOW);\r\n  if (millis() - timerVariable > sampleWindow) {\r\n    Serial.print(\"mic state: \");\r\n    Serial.println(micState);\r\n    Serial.print(\"arm position: \");\r\n    Serial.println(armState);\r\n    timerVariable = millis();\r\n  }\r\n\r\n}<\/pre>\n
         <\/p>\n","protected":false},"excerpt":{"rendered":"
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