List of the basic components required for IoT (Internet of Things)

MCU and Internet Shields:
1. Arduino UNO --- 1
2. Arduino NANO ---- 1 (Optional)
3. NodeMCU 1.0 -- 3
4. Arduino Ethernet Shield -- 1
5. ESP8266 -- 1 (Optional)
Components/Sensors/Sensor Shields:
6. LED (Green x 3, Red x 3, Yellow x 1)
7. LDR -- 1
8. Temperature Sensor (LM35 or TMP36) -- 1
9. 4 digit 7 segment display
11. PIR Motion Sensor -- 1
12. Sound Sensor Board --- 1
13. 12V1A \ 5V1A fully isolated switching power supply / AC-DC modules / 220V switch 12v 5v lose-lose (C4B1) -- 2
14. 2 channel relay module with opto isolation supports high and low trigger 5V--- 2
15. Generic PCB with bus lines ---- 2
16. Casing -- 3 ( one example below)
Accessories:
17. Soldering KIT
18. 220 ohm resistor (Color bands:REDREDBROWN) x 10
19. 10k resistor (Color bands: BROWNBLACKORANGE) x 10
20. RJ45 cable -- 1
21. Breadboard -- 1
22. USB cable (to connect Arduino UNO to PC) -- 1
23. Micro USB (to connect NodeMCU to PC) -- 1
24. Breadboard wires (male to male 40, male to female 40, female to female 40)
Learning Phase:
MCU and Internet Shields:
1. Arduino UNO --- 1
2. Arduino NANO ---- 1 (Optional)
3. NodeMCU 1.0 -- 1
4. Arduino Ethernet Shield -- 1
5. ESP8266 -- 1
Components/Sensors/Sensor Shields:
6. LED (Green x 3, Red x 3, Yellow x 1)
7. LDR -- 1
8. Temperature Sensor (LM35 or TMP36) -- 1
9. 4 digit 7 segment display
11. PIR Motion Sensor -- 1
12. Sound Sensor Board --- 1
13. 2 channel relay module with opto isolation supports high and low trigger 5V--- 1
Product 1:
NodeMCU, Relay, Power supply, Generic PCB, LDR, casing*
Product 2:
NodeMCU, Relay, Power Supply, Generic PCB, PIR sensor, casing*
Product 3:
NodeMCU, LED, Battery pack(4.5v), casing*
*Accessories will be common to all products



Ardino UNO
The Arduino Uno is an open-source microcontroller board based on the Microchip ATmega328P microcontroller and developed by Arduino.cc. The board is equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards (shields) and other circuits. The board has 14 Digital pins, 6 Analog pins, and programmable with the Arduino IDE (Integrated Development Environment) via a type B USB cable. It can be powered by the USB cable or by an external  9-volt battery, though it accepts voltages between 7 and 20 volts. It is also similar to the Arduino Nano and Leonardo.
NodeMCU 1.0
NodeMCU is an open source IoT platform. It includes firmware which runs on the ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which is based on the ESP-12 module.
Arduino Ethernet Shield
The Arduino Ethernet Shield allows you to easily connect your Arduino to the internet. This shield enables your Arduino to send and receive data from anywhere in the world with an internet connection.
LDR
A photoresistor (or light-dependent resistor, LDR, or photo-conductive cell) is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light-activated and dark-activated switching circuits.
Relay
A relay is an electrically operated switch that can be turned on or off, letting the current go through or not, and can be controlled with low voltages, like the 5V provided by the Arduino pins.
PCB
A printed circuit board (PCB) is an electronic circuit used in devices to provide mechanical support and a pathway to its electronic components.
Breadboard
A breadboard is used to build and test circuits quickly before finalizing any circuit design. The breadboard has many holes into which circuit components like ICs and resistors can be inserted.
Integrated Circuit
An integrated circuit, or IC, is small chip that can function as an amplifier, oscillator, timer, microprocessor, or even computer memory. An IC is a small wafer, usually made of silicon, that can hold anywhere from hundreds to millions of transistors, resistors, and capacitors.
Transistor
Transistors are semiconductor device used to amplify or switch electronic signals.
Capacitor
A capacitor is a device that stores electrical energy in an electric field. It is a passive electronic component with two terminals. It is designed to add capacitance to a circuit.
Resistor
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses. High-power resistors that can dissipate many watts of electrical power as heat, may be used as part of motor controls, in power distribution systems, or as test loads for generators. Fixed resistors have resistances that only change slightly with temperature, time or operating voltage. Variable resistors can be used to adjust circuit elements (such as a volume control or a lamp dimmer), or as sensing devices for heat, light, humidity, force, or chemical activity.


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