This project creates a medicine reminder system that helps elderly or forgetful individuals remember to take their medication. A PIR sensor detects when someone approaches the medicine cabinet, and if it’s time for medication, the system plays a reminder message and lights up LEDs.<\/p>\n
Difficulty:<\/strong> Intermediate A PIR sensor at the medicine cabinet detects when someone approaches. The system checks the current time against a schedule of medication times. If it’s within the reminder window, it plays a recorded message (via DFPlayer Mini) and lights up LEDs to remind the person to take their medicine. If the person opens the cabinet (detected by a reed switch), the reminder is marked as taken and the alarm stops.<\/p>\n \u8868<\/p>\n Add an LCD to show next medication time:<\/p>\n This medicine reminder system helps ensure medications are taken on time. With motion detection and audio reminders, it's especially helpful for elderly individuals or anyone who struggles with remembering medications.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview This project creates a medicine reminder system that helps elderly or forgetful individuals remember to take their medication. A PIR sensor detects when someone approaches the medicine cabinet, and if it’s time for medication, the system plays a reminder message and lights up LEDs. Difficulty: Intermediate Estimated time: 2-3 hours Estimated cost: $30-40 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-3927","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\n
\nEstimated time:<\/strong> 2-3 hours
\nEstimated cost:<\/strong> $30-40<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Circuit Diagram<\/h2>\n
Connection Table<\/h3>\n
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Component<\/th>\n Pin<\/th>\n ESP32 Pin<\/th>\n<\/thead>\n \nPIR Sensor<\/th>\n VCC<\/th>\n 5V<\/th>\n PIR Sensor<\/th>\n GND<\/th>\n GND<\/th>\n PIR Sensor<\/th>\n OUT<\/th>\n GPIO 4<\/th>\n DS3231 RTC<\/th>\n VCC<\/th>\n 3.3V<\/th>\n DS3231 RTC<\/th>\n GND<\/th>\n GND<\/th>\n DS3231 RTC<\/th>\n SDA<\/th>\n GPIO 21<\/th>\n DS3231 RTC<\/th>\n SCL<\/th>\n GPIO 22<\/th>\n DFPlayer Mini<\/th>\n VCC<\/th>\n 5V<\/th>\n DFPlayer Mini<\/th>\n GND<\/th>\n GND<\/th>\n DFPlayer Mini<\/th>\n TX<\/th>\n GPIO 16<\/th>\n DFPlayer Mini<\/th>\n RX<\/th>\n GPIO 17<\/th>\n Red LED<\/th>\n Anode<\/th>\n GPIO 5 (220\u03a9)<\/th>\n Green LED<\/th>\n Anode<\/th>\n GPIO 18 (220\u03a9)<\/th>\n Blue LED<\/th>\n Anode<\/th>\n GPIO 19 (220\u03a9)<\/th>\n Reed Switch<\/th>\n One side<\/th>\n GPIO 23 (pull-up)<\/th>\n Reed Switch<\/th>\n Other side<\/th>\n GND<\/th>\n<\/tbody>\n Preparing Audio Files<\/h2>\n
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Arduino Code<\/h2>\n
\/\/ Medicine Reminder System\n#include <Wire.h>\n#include <RTClib.h>\n#include <SoftwareSerial.h>\n#include <DFRobotDFPlayerMini.h>\n\nRTC_DS3231 rtc;\nSoftwareSerial mySoftwareSerial(16, 17); \/\/ RX, TX\nDFRobotDFPlayerMini myDFPlayer;\n\nconst int pirPin = 4;\nconst int redLedPin = 5;\nconst int greenLedPin = 18;\nconst int blueLedPin = 19;\nconst int doorSensorPin = 23;\n\n\/\/ Medication schedule (hour, minute, message file)\nstruct MedTime {\n int hour;\n int minute;\n int messageFile;\n bool taken;\n};\n\nMedTime medTimes[] = {\n {8, 0, 1, false}, \/\/ 8:00 AM\n {12, 0, 2, false}, \/\/ 12:00 PM\n {18, 0, 3, false} \/\/ 6:00 PM\n};\nconst int numMedTimes = 3;\n\nbool reminderActive = false;\nint activeMedIndex = -1;\nunsigned long lastMotionTime = 0;\nconst unsigned long reminderDuration = 60000; \/\/ 1 minute\n\nvoid setup() {\n Serial.begin(115200);\n \n pinMode(pirPin, INPUT);\n pinMode(redLedPin, OUTPUT);\n pinMode(greenLedPin, OUTPUT);\n pinMode(blueLedPin, OUTPUT);\n pinMode(doorSensorPin, INPUT_PULLUP);\n \n digitalWrite(redLedPin, LOW);\n digitalWrite(greenLedPin, LOW);\n digitalWrite(blueLedPin, LOW);\n \n if (!rtc.begin()) {\n Serial.println(\"RTC not found\");\n while (1);\n }\n \n mySoftwareSerial.begin(9600);\n if (!myDFPlayer.begin(mySoftwareSerial)) {\n Serial.println(\"DFPlayer error\");\n while (1);\n }\n myDFPlayer.volume(20);\n \n Serial.println(\"Medicine Reminder Ready\");\n delay(60000); \/\/ PIR warm-up\n}\n\nvoid checkScheduledTimes() {\n DateTime now = rtc.now();\n int currentHour = now.hour();\n int currentMinute = now.minute();\n \n for (int i = 0; i < numMedTimes; i++) {\n if (!medTimes[i].taken && \n currentHour == medTimes[i].hour && \n currentMinute >= medTimes[i].minute && \n currentMinute < medTimes[i].minute + 30) {\n \n if (!reminderActive) {\n reminderActive = true;\n activeMedIndex = i;\n Serial.printf(\"Reminder active for medication %d\\n\", i);\n \n \/\/ Blue LED for reminder\n digitalWrite(blueLedPin, HIGH);\n }\n return;\n }\n }\n}\n\nvoid playReminder() {\n if (activeMedIndex >= 0) {\n myDFPlayer.play(medTimes[activeMedIndex].messageFile);\n Serial.printf(\"Playing reminder %d\\n\", medTimes[activeMedIndex].messageFile);\n }\n}\n\nvoid markTaken() {\n if (activeMedIndex >= 0) {\n medTimes[activeMedIndex].taken = true;\n reminderActive = false;\n activeMedIndex = -1;\n \n digitalWrite(blueLedPin, LOW);\n digitalWrite(greenLedPin, HIGH);\n myDFPlayer.play(4); \/\/ \"Thank you\" message\n delay(2000);\n digitalWrite(greenLedPin, LOW);\n \n Serial.println(\"Medication taken\");\n }\n}\n\nvoid loop() {\n checkScheduledTimes();\n \n bool motion = digitalRead(pirPin) == HIGH;\n bool doorOpen = digitalRead(doorSensorPin) == LOW;\n \n if (reminderActive && motion) {\n if (millis() - lastMotionTime > 10000) { \/\/ Play every 10 seconds\n playReminder();\n lastMotionTime = millis();\n }\n digitalWrite(redLedPin, HIGH);\n } else {\n digitalWrite(redLedPin, LOW);\n }\n \n if (doorOpen && reminderActive) {\n markTaken();\n }\n \n if (reminderActive && (millis() - lastMotionTime > reminderDuration)) {\n digitalWrite(redLedPin, LOW);\n digitalWrite(blueLedPin, LOW);\n }\n \n delay(100);\n}\n<\/code><\/pre>\nEnhanced Version with LCD Display<\/h2>\n
#include <LiquidCrystal_I2C.h>\nLiquidCrystal_I2C lcd(0x27, 16, 2);\n\nvoid updateDisplay() {\n lcd.setCursor(0, 0);\n lcd.print(\"Next med: \");\n \n for (int i = 0; i < numMedTimes; i++) {\n if (!medTimes[i].taken) {\n lcd.print(medTimes[i].hour);\n lcd.print(\":\");\n if (medTimes[i].minute < 10) lcd.print(\"0\");\n lcd.print(medTimes[i].minute);\n break;\n }\n }\n \n lcd.setCursor(0, 1);\n if (reminderActive) {\n lcd.print(\"Take med NOW!\");\n } else {\n lcd.print(\"System ready\");\n }\n}\n<\/code><\/pre>\nInstallation Steps<\/h2>\n
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Project Extensions<\/h2>\n
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Troubleshooting<\/h2>\n
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Conclusion<\/h2>\n