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<\/a>Glue the components on the box.<\/p>\nOverall the build process was what we expected. We stuck closely to our initial design and the electronics cooperated with the vision of our final product. There were a few strange library conflict with our text to speech library but that was debugged rather quickly. All of our box parts fit well and the foresight to use clearly labeled stranded wire made assembly very easy.<\/p>\n
<\/p>\n
Conclusions and Lessons Learned<\/h3>\n
Starting with the final critique. We were overall pleased with the final presentation and critique of the project. There were some last minute software\/ electric related bugs but other than that, our device performed as expected.\u00a0<\/span><\/p>\n <\/p>\n
The feedback that we received was roughly split into 2 categories: design and execution. The design related feedback was very insightful as at that point in time, we had been staring at this particular design for a couple weeks, having fresh perspectives was nice. Much of the feedback centered around the user friendliness of the design stating that :\u201d<\/span>Some of the usability was unclear, it could benefit from some labels to clarify what each numbers are corresponding to and a volume potentiometer.<\/span><\/p>\n\u201c and \u201c<\/span>Would be helpful if the buttons read out their purposes as well as the corresponding figures, as well as having the displays physically labeled\u201d. The core of the feedback that complimented the design on its sleekness and minimal look also criticized the confusing nature of the placement of the buttons. It would probably be a good idea to label the buttons as it does not really detract from the overall look or function of the device. It was an issue of running out of time that we chose not to mess with the overall design too much. In addition, the displays being physically labeled would probably preclude the need for labeling the buttons. We also had a design comment about the placement of the thermometer over the speaker cutout. \u201cPlacement of thermometer rest in proximity to speaker holes presents moisture challenges and could be made more ergonomic.\u201d This was very interesting as we had not considered the potential for the thermistor to become wet and leak into the speaker port. Given that both the port and the mount are easily moved. A future interaction would definitely address this. There was also a comment about adding some rubber feet to the device to prevent it from slipping. This would probably be a good idea on a commercial version but we designed the device to fit on a specific shelf where slipping when pushing a button would not cause any problems.<\/span><\/p>\n <\/p>\n
Finally on execution notes. A lot of notes were on the buggy timer and screen flashing which we were aware of potential fixes already. However, there were some software notes that we had not considered. One interesting note is that \u201cNeeds warning beeps at T\u20135\u00b0, solid alarm tone at T\u00b0, and a constant (but dismissable) BURN ALERT at something like T+10\u00b0.\u201d While designing the functionality of the product, we only considered a warning when the temperature was met with the assumption that Bill would be able to head and see it. If it’s the case that he is in another room, we did not consider that possibility. A future iteration would include an approaching temperature chime as well as a burn warning that is sustained in order to address these cases. I think this was just a situation where we did not consider the possibility of him missing the complete chime.\u00a0<\/span><\/p>\n <\/p>\n
Overall the feedback was very insightful and having many experienced perspectives really helped us understand the advantages and disadvantages of the design choices that we made.<\/span><\/p>\n <\/p>\n
Working with Bill was an overall good experience. We think given that he was the coordinator and CLASS staff, our experience might be different from other groups working with CLASS members. With Bill specifically, something like not being able to see the doneness of meat was not a complication that we had ever considered with color blindness. Having him as a client made us aware of a lot of issues that partial vision deficiency could cause for a person even if it’s not as serious as full blindness. We are grateful for the opportunity to work with him. We also learned valuable lessons working with and interacting with the other clients in the project as well as the CLASS trip. Prior to this project, we did not have a lot of experience interacting with the disabled community and this project gave a lot of insight into their lives and struggles.\u00a0<\/span><\/p>\n <\/p>\n
Finally, some notes about this project. This project ran smoothly overall and the team worked well together. The division of tasks was more or less equal and people were able to bring their specialized skills to make the project what it was. Given the opportunity to do it again, our process would be very similar. We built it flex time in the event that something went wrong which helped us out a lot in the end. This final project was an excellent close to a very interesting and engaging class. <\/span><\/p>\n <\/p>\n
Technical Details<\/h3>\n\n- \n
Schematic and Block Diagram<\/h4>\n<\/li>\n<\/ul>\n
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Codes<\/h4>\n<\/li>\n<\/ul>\n\/*\r\nProject Name: Bill's Cooking Buddy Helper\r\nProject Members: Sapna Tayal, Angie (Chuyi) Wang, Harry Ren\r\nCode Author: Harry Ren\r\n- Assistive Meat Thermometer and Cooking timer\r\n- Keypad input for target temperature\r\n- All values displayed on 7 segments and can be read via speaker\r\n\r\nController: Arduino Mega\r\n\r\nPin Mapping:\r\nA0: Keypad pin 1\r\nA1: Keypad pin 2\r\nA2: Keypad pin 3\r\nA3: Keypad pin 4\r\n10: Keypad pin 5\r\n11: Keypad pin 6\r\n12: Keypad pin 7\r\n13: Keypad pin 8\r\n\r\n2: Current Temp Button\r\n3: Target Temp Button\r\n4: Timer Button\r\n\r\nA8: Hour Potentiometer Pin\r\nA9: Minute Potentiometer Pin\r\n\r\n6: Main Audio Amp Pin\r\n7: Inverted Audio Amp Pin\r\n\r\nA10: Temp Probe Pin\r\n\r\nNote: all 7 Segment pins connect to I2C Bus (master-slave) System\r\nSDA: 7 Segment main SDA\r\nSCL: 7 Segment main SCL\r\n\r\nPortions of code are adapted from the following sources\r\n- https:\/\/forum.arduino.cc\/t\/another-bbq-thermometer-wifi-enabled-with-push-notifications\/225467\r\n- https:\/\/forum.arduino.cc\/t\/countdown-timer-and-adafruit-4-digit-7-segment-display-w-i2c-backpack\/364882\/2\r\n- https:\/\/www.instructables.com\/Arduino-Text-to-Speech-Converter-Using-LM386-Talki\/\r\nrelevant functions are credited\r\ncode by Harry Ren at Carnegie Mellon University (hjren@andrew.cmu.edu)\r\nreleased by author to public domain, April 2023\r\n*\/\r\n\r\n\r\n#include <Keypad.h>\r\n#include <OneWire.h>\r\n#include <DallasTemperature.h>\r\n#include \"Talkie.h\"\r\n#include \"Vocab_US_Large.h\"\r\n#include <Wire.h> \/\/ Enable this line if using Arduino Uno, Mega, etc.\r\n#include <Adafruit_GFX.h>\r\n#include \"Adafruit_LEDBackpack.h\"\r\n#include <math.h>\r\n\r\n\/\/Lines 12-19 adapted from https:\/\/forum.arduino.cc\/t\/another-bbq-thermometer-wifi-enabled-with-push-notifications\/225467\/2\r\nfloat air; \/\/ temperature\r\nfloat meat; \/\/ Unused from sample code\r\nfloat vin = 4.999; \/\/ DC Voltage as measured with DMM between +5V and GND\r\nfloat r2 = 100000; \/\/ Resistance in ohms of your fixed resistor\r\n\r\nfloat A = 0.00004556837992; \/\/ \"A\" Coeffecient in Steinhart-Hart Equation\r\nfloat B = 0.0002634285613; \/\/ \"B\"\r\nfloat C = 0.00000005286310982; \/\/ \"C\"\r\n\r\nconst int sw1 = 2; \/\/current temp button\r\nconst int sw2 = 3; \/\/tgt temp button\r\nconst int sw3 = 4; \/\/timer button\r\nconst int sw4 = 5; \/\/io switch\r\n\r\nTalkie voice; \/\/init speaker\r\n\r\n\/\/ Define the pins for the 7-segment display: depreciated\r\nconst int digitPins[] = { 2, 3, 4, 5 };\r\nconst int segmentPins[] = { 6, 7, 8, 9, 10, 11, 12 };\r\n\r\n\/\/ Define the keypad\r\nconst byte ROWS = 4;\r\nconst byte COLS = 4;\r\nchar keys[ROWS][COLS] = {\r\n { '1', '2', '3', 'A' },\r\n { '4', '5', '6', 'B' },\r\n { '7', '8', '9', 'C' },\r\n { '*', '0', '#', 'D' }\r\n};\r\nbyte rowPins[ROWS] = { A0, A1, A2, A3 }; \/\/keypad pins\r\nbyte colPins[COLS] = { 10, 11, 13, 12 }; \/\/keypad pins\r\nKeypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);\r\n\r\n\r\nAdafruit_7segment mat = Adafruit_7segment(); \/\/curr 7seg\r\nAdafruit_7segment mat1 = Adafruit_7segment(); \/\/tgt 7seg\r\nAdafruit_7segment matrix = Adafruit_7segment(); \/\/timer 7seg\r\n\r\nint number = 0; \/\/curr tgt\r\nint temp = 0; \/\/curr temp\r\n\r\nint startMinute = 4; \/\/ Modify these defines to\r\nint startSecond = 59; \/\/ change the timer interval\r\nint minutes = startMinute;\r\nint seconds = startSecond;\r\nbool notStarted = 0; \/\/timer started bool flag\r\n\r\nunsigned long previousSecondMillis = 0UL;\r\nlong oneSecond = 1000UL; \/\/ milliseconds per second\r\n\r\nconst int POT_PIN_H = A8;\r\nconst int POT_PIN_M = A9;\r\nint digit_H = 0;\r\nint digit_M = 0;\r\n\r\n\r\nvoid setup() {\r\n\r\n Serial.begin(9600);\r\n\r\n \/\/init button pins\r\n pinMode(sw1, INPUT);\r\n pinMode(sw2, INPUT);\r\n pinMode(sw3, INPUT);\r\n\r\n \/\/init 7 segments\r\n mat.begin(0x70);\r\n mat1.begin(0x71);\r\n matrix.begin(0x72);\r\n mat.print(number);\r\n mat1.print(temp);\r\n\r\n matrix.writeDigitRaw(2,0x2);\r\n \r\n \/\/ Set the digit pins as outputs: depreciated\r\n for (int i = 0; i < 4; i++) {\r\n pinMode(digitPins[i], OUTPUT);\r\n }\r\n\r\n \/\/ Set the segment pins as outputs: depreciated\r\n for (int i = 0; i < 7; i++) {\r\n pinMode(segmentPins[i], OUTPUT);\r\n }\r\n\r\n\/\/init speaker code: depreciated\r\n#if defined(TEENSYDUINO)\r\n pinMode(5, OUTPUT);\r\n digitalWrite(5, HIGH); \/\/Enable Amplified PROP shield\r\n#endif\r\n}\r\n\r\n\r\nvoid loop() {\r\n \/\/read switches\r\n int switch1 = digitalRead(sw1);\r\n int switch2 = digitalRead(sw2);\r\n int switch3 = digitalRead(sw3);\r\n int switch4 = digitalRead(sw4);\r\n\r\n \/\/BUTTON CODE\r\n if (switch1 == 1) {\r\n readnum(number);\r\n }\r\n if (switch2 == 1) {\r\n readnum((int)air);\r\n }\r\n if (switch3 == 1) {\r\n notStarted = 1;\r\n \/\/previousSecondMillis = 0UL;\r\n }\r\n \r\n\r\n \/\/TEMP PROBE CODE\r\n \/\/read and update current temp\r\n readSensors();\r\n mat1.print((int)air);\r\n\r\n \/\/KEYPAD CODE\r\n \/\/ Wait for a key press\r\n char key = keypad.getKey();\r\n char printednum = '0';\r\n \/\/ If a key was pressed, display and read the corresponding number\r\n if (key != NO_KEY) {\r\n int newnumber = getNumberForKey(key);\r\n saynum(newnumber);\r\n if (newnumber == 14) {\r\n number = 0;\r\n mat.clear();\r\n }\r\n \/\/update the 7 seg number\r\n else if (number < 1000 && newnumber != 14 && newnumber != 15) {\r\n number = number * 10 + newnumber;\r\n }\r\n mat.print(number);\r\n \/\/Serial.println(number);\r\n }\r\n if (switch4==1){\r\n mat.clear();\r\n mat1.clear();\r\n \r\n }\r\n mat.writeDisplay();\r\n mat1.writeDisplay();\r\n\r\n \/\/TIMER CODE\r\n \/\/Setting timer\r\n if (notStarted == 0) {\r\n int potVal_H = analogRead(POT_PIN_H);\r\n int potVal_M = analogRead(POT_PIN_M);\r\n\r\n digit_H = map(potVal_H, 1023, 0, 0, 30);\r\n digit_M = map(potVal_M, 1023, 0, 0, 59);\r\n\r\n startMinute = digit_H; \r\n startSecond = digit_M; \r\n minutes = startMinute;\r\n seconds = startSecond;\r\n matrix.writeDigitNum(0, (minutes \/ 10));\r\n matrix.writeDigitNum(1, (minutes % 10));\r\n matrix.writeDigitNum(3, (seconds \/ 10));\r\n matrix.writeDigitNum(4, (seconds % 10));\r\n if (switch4==1){\r\n matrix.clear();\r\n\r\n }\r\n matrix.writeDisplay();\r\n }\r\n\r\n else {\r\n \/\/ Countdown timer\r\n \/\/adapted from https:\/\/forum.arduino.cc\/t\/countdown-timer-and-adafruit-4-digit-7-segment-display-w-i2c-backpack\/364882\/2\r\n \/\/ --------- Run this every second ------------------\r\n if (millis() - previousSecondMillis >= oneSecond) {\r\n \/\/update 7 seg per second\r\n matrix.writeDigitNum(0, (minutes \/ 10));\r\n matrix.writeDigitNum(1, (minutes % 10));\r\n matrix.writeDigitNum(3, (seconds \/ 10));\r\n matrix.writeDigitNum(4, (seconds % 10));\r\n if (switch4==1){\r\n matrix.clear(); \r\n }\r\n matrix.writeDisplay();\r\n if (seconds-- == 0) {\r\n if (minutes == 0) {\r\n \/\/If timer reaches 0\r\n notStarted = 0;\r\n voice.say(sp2_COMPLETE);\r\n \/\/minutes = startMinute;\r\n \/\/seconds = startSecond;\r\n delay(1000);\r\n } else {\r\n \/\/ rollever from n:00 to (n-1):59\r\n minutes -= 1;\r\n seconds = 59;\r\n }\r\n }\r\n\r\n previousSecondMillis += oneSecond;\r\n }\r\n }\r\n}\r\n\r\n\/\/reads a 4 dig number on speaker\r\nvoid readnum(int number) {\r\n if (number > 999) {\r\n saynum((number \/ 1000) % 10);\r\n }\r\n if (number > 99) {\r\n saynum((number \/ 100) % 10);\r\n }\r\n if (number > 9) {\r\n saynum((number \/ 10) % 10);\r\n }\r\n if (number > -1) {\r\n saynum(number % 10);\r\n }\r\n}\r\n\r\n\/\/reads a single number\r\nvoid saynum(int n) {\r\n switch (n) {\r\n case 1:\r\n voice.say(sp2_ONE);\r\n return;\r\n case 2:\r\n voice.say(sp2_TWO);\r\n return;\r\n case 3:\r\n voice.say(sp2_THREE);\r\n return;\r\n case 4:\r\n voice.say(sp2_FOUR);\r\n return;\r\n case 5:\r\n voice.say(sp2_FIVE);\r\n return;\r\n case 6:\r\n voice.say(sp2_SIX);\r\n return;\r\n case 7:\r\n voice.say(sp2_SEVEN);\r\n return;\r\n case 8:\r\n voice.say(sp2_EIGHT);\r\n return;\r\n case 9:\r\n voice.say(sp2_NINE);\r\n return;\r\n case 0:\r\n voice.say(sp2_ZERO);\r\n return;\r\n case 14:\r\n voice.say(sp3_CLEAR);\r\n return;\r\n case 15:\r\n \/\/readnum();\r\n return;\r\n\r\n default: return;\r\n }\r\n}\r\n\r\n\r\n\/\/ Convert the key to a number (casting caused problems)\r\nint getNumberForKey(char key) {\r\n switch (key) {\r\n case '0': return 0;\r\n case '1': return 1;\r\n case '2': return 2;\r\n case '3': return 3;\r\n case '4': return 4;\r\n case '5': return 5;\r\n case '6': return 6;\r\n case '7': return 7;\r\n case '8': return 8;\r\n case '9': return 9;\r\n case 'A': return 10;\r\n case 'B': return 11;\r\n case 'C': return 12;\r\n case 'D': return 13;\r\n case '*': return 14;\r\n case '#': return 15;\r\n default: return 0;\r\n }\r\n}\r\n\r\n\r\n\/\/Depreciated Function\r\nvoid displayNumber(int number) {\r\n int digits[4];\r\n digits[0] = number % 10;\r\n digits[1] = (number \/ 10) % 10;\r\n digits[2] = (number \/ 100) % 10;\r\n digits[3] = (number \/ 1000) % 10;\r\n}\r\n\r\n\/\/ Reads and updates current temp\r\n\/\/ adapted from https:\/\/forum.arduino.cc\/t\/another-bbq-thermometer-wifi-enabled-with-push-notifications\/225467\r\nvoid readSensors() {\r\n float a0 = analogRead(A10); \/\/ This reads the \"voltage\" value on A0. Value is actually divided into 1024 steps from 0-1023.\r\n float v0 = a0 * .0049; \/\/ Converts A0 value to an actual voltage (5.0V \/ 1024 steps = .0049V\/step.\r\n float r0 = (((r2 * vin) \/ v0) - r2); \/\/ Calculates resistance value of thermistor based on fixed resistor value and measured voltage\r\n float logr0 = log(r0); \/\/ Natural log of thermistor resistance used in Steinhart-Hart Equation\r\n float logcubed0 = logr0 * logr0 * logr0; \/\/ The cube of the above value\r\n float k0 = 1.0 \/ (A + (B * logr0) + (C * logcubed0)); \/\/ Steinhart-Hart Equation to calculate temperature in Kelvin\r\n float f0 = (1.8 * (k0 - 273)) + 32; \/\/ Convert temperature to Fahrenheit\r\n\r\n if (isnan(f0)) \/\/ If value is not a number, assign an arbitrary value\r\n {\r\n air = int(1);\r\n } else {\r\n air = f0; \/\/ Otherwise use the calculated value\r\n }\r\n}<\/pre>\n <\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Introduction In this class, we worked collaboratively with our client\u00a0 Bill, who has achromatopsia and is sensitive to light. We aimed to create an assistive device to…<\/p>\n","protected":false},"author":43,"featured_media":18307,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[159],"tags":[],"_links":{"self":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/posts\/18115"}],"collection":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/users\/43"}],"replies":[{"embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/comments?post=18115"}],"version-history":[{"count":15,"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/posts\/18115\/revisions"}],"predecessor-version":[{"id":18368,"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/posts\/18115\/revisions\/18368"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/media\/18307"}],"wp:attachment":[{"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/media?parent=18115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/categories?post=18115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/courses.ideate.cmu.edu\/60-223\/s2023\/work\/wp-json\/wp\/v2\/tags?post=18115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/a><\/p>\n