{"id":1569,"date":"2022-10-25T00:24:22","date_gmt":"2022-10-25T04:24:22","guid":{"rendered":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/?p=1569"},"modified":"2022-10-25T00:24:22","modified_gmt":"2022-10-25T04:24:22","slug":"person-in-time-informal-update","status":"publish","type":"post","link":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/somanybugs\/10\/25\/person-in-time-informal-update\/","title":{"rendered":"Person in Time, Informal Update"},"content":{"rendered":"

Woarb update:\u00a0 the waorb is becoming warmer.<\/p>\n

Seriously though… Here’s the waorb prototype circuit.<\/p>\n

\"\"<\/p>\n

As you can see it’s basically the circuit from the waorb proposal (missing the on\/off switch, heater being powered by an external power supply) with the addition of a momentary switch and a cockroft-walton ladder to power the MOSFET switching the heater.<\/p>\n

Let’s break it down a bit more!<\/p>\n

HEATER ELEMENT TEST<\/strong><\/p>\n

The heater is made from 40 gauge steel wire (ie. about human hair width)–and in order to achieve the right resistance (~10 ohms). The batteries I intend to use in the final waorb should be able to create about a 6.6w heater so I tested the heating elements to determine how well they could heat the brass using A and V which would produce 6.6w.<\/p>\n

\"\" \"\"<\/p>\n

Above: my horrible math notes.<\/p>\n

I found that on the brass sheet (about 6 times as much brass as in the waorb) I was able to heat the brass to about 89.0 degrees f.<\/p>\n

This was important because I now know:<\/p>\n

    \n
  1. That the woarb should perform as hoped (heating power and thermal tape attachment wise). The heating elements I created don’t catch fire.<\/li>\n
  2. The number of wires at what length I will need in the final waorb (resistance is directly proportional to length of wire and inversely proportional to number of wires of said length). I will need 3 wires at ~5.5″ for each heating element.<\/li>\n<\/ol>\n

    CIRCUIT BUILDING<\/strong><\/p>\n

    I then built the circuit needed to power on an RGB LED on a breadboard with an Arduino and installed Arduino. (As shown in the design).<\/p>\n

    After that I built the temp circuit (as shown in the design) and used the serial port on the Arduino to test it was working. Once it was working I took readings to calibrate it.<\/p>\n

    \n
    \n
    Reading | temp in F | temp in C | Temp in 10ths of C<\/div>\n
    880\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 71.5\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 22.2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 222<\/div>\n
    680\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 85.5\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a030.1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0301<\/div>\n
    580\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 96.9\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 35.5\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 355<\/div>\n
    640\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 94.2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 35\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0350<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n
    I used these values to find a line of best fit to convert the sensor reading into 10ths of degrees C (so they can be stored accurately without floating point numbers).<\/div>\n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n

    After this I added the heater element back into the circuit (almost as shown on the design, added a cockroft-walton ladder to make the MOSFET work correctly).<\/p>\n

    After this I added a momentary switch to change modes in the final program.<\/p>\n

    PROGRAM\u00a0\u00a0<\/strong><\/p>\n

    Currently the program is able to: switch between modes when the mom switch is clicked–showing a different LED color for each, take the temperature when the switch is single clicked in listening mode–showing a white flash from the LED, record the temperature into in 10ths of degrees c to an array.<\/p>\n

    TODO: add the heater control, make the LEDs change dynamically with temperature in listen and repeat mode. I’m sure some other stuff I’m forgetting.<\/p>\n

    \n
    \n
    \/\/vars for button stuff bool pressed;<\/div>\n
    int pressnum = 0;<\/div>\n
    unsigned long pressMil; \/\/there is a bug where milli() runs out of space and makes measurements invalid… maybe fixed abs <\/em><\/div>\n
    int mode = 0; int test; \/\/vars for recalibrating the temp sensor (form: y=mx+b)y is degrees in 10ths of c, x is sensor data number <\/em><\/div>\n
    float m = -0.4639; int b = 629; \/\/array for temps recorded <\/em><\/div>\n
    int currentSlot = 0; \/\/check to make sure this is correct<\/em><\/div>\n
    int tempsRec[100];<\/div>\n
    <\/div>\n
    \/\/write mode 0 here (ie. startup\/idle mode)<\/em><\/div>\n
    void idle () {<\/div>\n
    analogWrite(9, 0);<\/div>\n
    analogWrite(10, 0);<\/div>\n
    analogWrite(11, 150); }<\/div>\n
    <\/div>\n
    \/\/write mode 1 here (ie. listening mode) <\/em><\/div>\n
    void listens () {<\/div>\n
    \/\/temp sensing <\/em><\/div>\n
    int tempSensor = analogRead(A5);<\/div>\n
    int temp = m*tempSensor+b; \/\/temp in 10ths of degrees C<\/em><\/div>\n
    \/\/LEDS <\/em><\/div>\n
    analogWrite(9, 0);<\/div>\n
    analogWrite(10, 150);<\/div>\n
    analogWrite(11, 0); }<\/div>\n<\/div>\n
    \n
    \n
    \n
    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \/\/write the picture function here (ie. take temp and store it)<\/em><\/div>\n
    void picture () {<\/div>\n
    analogWrite(9, 255);<\/div>\n
    analogWrite(10, 255);<\/div>\n
    analogWrite(11, 255);<\/div>\n
    int tempSensor = analogRead(A5);<\/div>\n
    int temp = m*tempSensor+b; \/\/temp in 10ths of degrees C<\/em> tempsRec[currentSlot] = temp; currentSlot++;<\/div>\n
    delay(500);<\/div>\n
    analogWrite(9, 0);<\/div>\n
    analogWrite(10, 0);<\/div>\n
    analogWrite(11, 0); }<\/div>\n
    <\/div>\n
    \/\/write mode 2 here, (ie. run the heater correctly)<\/em><\/div>\n
    void repeat () {<\/div>\n
    analogWrite(9, 150);<\/div>\n
    analogWrite(10, 10);<\/div>\n
    analogWrite(11, 0); }<\/div>\n
    <\/div>\n
    \/\/IRS<\/div>\n
    void switchPressed () {<\/div>\n
    pressed = true;<\/div>\n
    pressMil = millis(); }<\/div>\n
    <\/div>\n
    void setup() {<\/div>\n
    \/\/ put your setup code here, to run once: <\/em><\/div>\n
    pinMode(9, OUTPUT);<\/div>\n
    pinMode(10, OUTPUT);<\/div>\n
    pinMode(11, OUTPUT);<\/div>\n
    digitalWrite(3, HIGH);<\/div>\n
    attachInterrupt (digitalPinToInterrupt (3), switchPressed, CHANGE); pinMode(A5, INPUT);<\/div>\n
    analogReference(INTERNAL);<\/div>\n
    Serial.begin(9600); }<\/div>\n
    <\/div>\n
    void loop() {<\/div>\n
    \/\/ put your main code here, to run repeatedly: <\/em><\/div>\n
    \/\/this whole part controls the mode selection and picture action <\/em><\/div>\n
    test = pressMil+500-abs(millis());<\/div>\n
    if (pressed == true) {<\/div>\n
    pressnum++;<\/div>\n
    delay(250);<\/div>\n
    pressed=false; }<\/div>\n
    \nif (test < 0) { pressnum=0; }<\/div>\n
    else if (pressnum >= 2) { mode++; delay(500); }<\/div>\n
    <\/div>\n
    if (test > 0 && mode == 1 && pressnum == 1) { picture(); }<\/div>\n
    if (mode==3) { mode = 0; }<\/div>\n
    \n\/\/these run the mode code depending on the mode<\/em><\/div>\n
    if (mode==0) { idle(); }<\/div>\n
    else if (mode==1) { listens(); }<\/div>\n
    else if (mode==2) { repeat(); }
    \n}<\/div>\n<\/div>\n<\/div>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    Woarb update:\u00a0 the waorb is becoming warmer. Seriously though… Here’s the waorb prototype circuit. As you can see it’s basically the circuit from the waorb proposal (missing the on\/off switch, heater being powered by an external power supply) with the addition of a momentary switch and a cockroft-walton ladder to power the MOSFET switching the … Continue reading “Person in Time, Informal Update”<\/span><\/a><\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[],"_links":{"self":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/posts\/1569"}],"collection":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/comments?post=1569"}],"version-history":[{"count":1,"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/posts\/1569\/revisions"}],"predecessor-version":[{"id":1573,"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/posts\/1569\/revisions\/1573"}],"wp:attachment":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/media?parent=1569"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/categories?post=1569"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-461\/f2022\/wp-json\/wp\/v2\/tags?post=1569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}