Uncodemy Greater Noida Campus IoT Course Details

IoT course checklist (confirm each one)
[ ] Basic electronics and safety
[ ] Arduino IDE or MicroPython setup
[ ] Digital and analog input / output
[ ] Sensors: temperature, humidity, motion
[ ] Actuators: relay, servo, buzzer
[ ] Wi-Fi on ESP32
[ ] MQTT publish and subscribe
[ ] A cloud or local dashboard
[ ] Device security basics
[ ] Final project with documentation

// Arduino C++: blink the built-in LED every second
void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);
  delay(1000);
}

# MicroPython on ESP32: read a DHT22 on GPIO 4
import dht
import machine
import time

sensor = dht.DHT22(machine.Pin(4))

while True:
    sensor.measure()
    print("Temp:", sensor.temperature(), "C",
          "Humidity:", sensor.humidity(), "%")
    time.sleep(2)

DHT22 to ESP32 wiring
VCC  -> 3.3V
DATA -> GPIO 4 (with 10k pull-up to 3.3V
        if your module has no built-in resistor)
GND  -> GND
Safety: unplug USB before changing wires.

# pip install paho-mqtt  (works with paho-mqtt 2.x)
import paho.mqtt.client as mqtt

def on_message(client, userdata, msg):
    print(msg.topic, msg.payload.decode())

client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
client.on_message = on_message
client.connect("localhost", 1883)
client.subscribe("home/#")
client.loop_forever()

# With Mosquitto installed locally:
# Terminal 1 - listen to all home topics
mosquitto_sub -h localhost -t "home/#" -v

# Terminal 2 - publish a fake reading
mosquitto_pub -h localhost -t "home/room1/temperature" -m "27.5"

Beginner:   Room temperature monitor with live chart
Beginner:   Motion-activated light with PIR + relay
Mid-level:  Plant watering alert using soil moisture sensor
Mid-level:  Smart energy logger for a desk fan
Advanced:   Multi-room dashboard with MQTT topics
Advanced:   Door sensor with phone notification

# Room Climate Monitor (ESP32 + DHT22 + MQTT)
## Hardware
ESP32, DHT22, breadboard, jumper wires
## How it works
ESP32 reads temperature every 10 s and publishes to
home/room1/temperature. A Python script subscribes and logs.
## Results
Stable readings, reconnects after Wi-Fi drops.
## Next steps
Add alerts above 35 C.

Date       Test                         Result
---------  ---------------------------  -------
Day 1      Sensor reads on bench         Pass
Day 2      Publish to local broker       Pass
Day 3      Wi-Fi drop and reconnect      Fixed
Day 4      24-hour logging run           Pass