Assistive Smart Home IoT System for Elderly Parents in Nepal | DIY Guide

Educational Notes

This project is designed to be accessible to students from Class 4 to Masters level, with complexity scalable to match different age groups and skill levels.

Learning Objectives:

• Understand basic electronics and circuitry principles
• Learn sensor applications and data collection techniques
• Develop problem-solving skills through hands-on building and troubleshooting
• Apply programming concepts to control hardware and process data
• Connect projects to real-world Nepalese contexts and challenges

Adaptability:

• For younger students (Class 4-8): Focus on assembling pre-built circuits, observing results, and understanding basic concepts
• For intermediate students (Class 9-12): Modify code, experiment with parameters, and explore underlying principles
• For advanced students (Undergraduate/Masters): Optimize designs, add features, conduct research extensions, and analyze performance

Safety Note: Always supervise younger students when working with electricity, heat, or moving parts.

Ensuring the safety, mobility, and medical adherence of aging parents is a key priority for Nepali families. In this guide, we design and build a 3-in-1 Assistive Care Station tailored for Nepali homes.

Hardware Bill of Materials (In Stock at Ghumti Pasal):

• Controller: Wireless module CH340G NodeMCU V3 ESP8266
• Motion Detection: HC-SR501 Adjust IR Pyroelectric Infrared PIR Module
• Bedside Input: TTP223 Touch Key Switch Module Touch Button
• Audible Alarm: 2x Active Buzzer (5V)
• Power Management: Type C 5V 1A 18650 TP4056 Lithium Charger Module
• Rechargeable Battery: 18650 3.7V 3000mAh Lithium-Ion Battery

Circuit Pinout & Wiring Connections:

Complete ESP8266 Firmware

#include <ESP8266WiFi.h>

const int touchPin = D2;
const int pirPin = D1;
const int buzzerPin = D5;

void setup() {
  Serial.begin(115200);
  pinMode(touchPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, LOW);
  Serial.println("Assistive Care Node Initialized");
}

void loop() {
  if (digitalRead(touchPin) == HIGH) {
    Serial.println("EMERGENCY: Bedside Help Button Pressed!");
    digitalWrite(buzzerPin, HIGH);
    delay(3000);
    digitalWrite(buzzerPin, LOW);
  }
  delay(100);
}