Building Assistive Smart Home Technology for Aging Populations using IoT & Microcontrollers

Commercial assistive tech is often expensive and can be hard to configure for rural or older households. Using simple, open-source microcontrollers like the Arduino or ESP32, you can build reliable safety systems tailored to the exact needs of your elderly relatives.

Core Challenges & DIY Answers

1. Pill Tracking: Forgetting medication schedules.
2. Nighttime Safety: Tripping in dark hallways or staircases.
3. Emergency Notification: Needing a simple, reliable way to call for help without dealing with a smartphone screen.

Project 1: The Automated Pill Dispenser

This dispenser uses a stepper motor to rotate a wheel containing daily medication doses.

• Control: A DS3231 real-time clock (RTC) module acts as the timer, which is much more accurate than relying on the microcontroller's internal clock.
• Alert: When the time arrives, a buzzer sounds and an LED flashes. An infrared beam sensor placed in the delivery slot checks if the pill drawer was pulled. If it isn't opened, the controller pushes an alert over WiFi.

Project 2: Under-Bed Pathway Lighting

Fumbling for light switches in the middle of the night can lead to trips and falls.

Mount a 12V LED strip under the lip of the bed or along the base of the wall. Connect a PIR motion sensor to detect when someone stands up. The controller fades the LED strip on gently, keeps it lit while there is movement, and turns it off after they return to bed.

const int PIR_PIN = 2;
const int LED_PIN = 9; // Must support PWM output

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  if (digitalRead(PIR_PIN) == HIGH) {
    // Fade light on
    for (int brightness = 0; brightness <= 180; brightness += 5) {
      analogWrite(LED_PIN, brightness);
      delay(20);
    }
    
    // Hold light on for 15 seconds
    delay(15000);
    
    // Fade light off
    for (int brightness = 180; brightness >= 0; brightness -= 5) {
      analogWrite(LED_PIN, brightness);
      delay(20);
    }
  }
}

Tips for Building Safety Systems

• Isolation of High Voltage: Never use mains AC voltage directly on your project breadboard. Always use isolated DC power supplies or enclosed, pre-built relay boxes if switching AC appliances.
• Backup Power: Make sure your controller is connected to a battery backup (like a small LiPo battery shield) so it continues monitoring during local power failures.