Data Logging: The Internet of Things: 11

This tutorial guides you through setting up a circuit using the ESP 8266 to record sensor values and post them to the Internet via ThingSpeak. It covers the hardware setup, software programming in Arduino IDE, and the process of sending data using HTTP requests. The lesson includes detailed explanations of the setup and loop functions, data handling, and testing the final setup.

What is the purpose of using a potentiometer in the circuit setup?

• To measure digital signals

• To act as a switch

• To simulate an analog input

• To provide a constant voltage

Why is a voltage divider used in the circuit?

• To stabilize the current

• To increase the voltage to 5V

• To step down the voltage from 3.3V to 1V

• To convert AC to DC

What is the first step in the software setup for the ESP8266?

• Include the ESP8266 library

• Initialize the serial monitor

• Define the main loop

• Set up the Wi-Fi connection

What is the purpose of the Wi-Fi client class in the setup?

• To read analog inputs

• To manage sensor data

• To establish a connection to the Internet

• To control the LED

What is the role of the while loop in the setup function?

• To continuously read sensor data

• To wait until a Wi-Fi connection is established

• To send data to Thingspeak

• To initialize the serial monitor

In the loop function, why are sensor values converted to strings?

• To perform mathematical operations

• To display on an LCD

• To send them over HTTP

• To save memory

What is the purpose of concatenating sensor data into one string?

• To reduce the size of the data

• To prepare it for HTTP transmission

• To encrypt the data

• To store it in a database

Which HTTP method is used to send data to Thingspeak?

• GET

• DELETE

• POST

• PUT

What is the significance of the content length header in the HTTP request?

• It determines the server's response time

• It sets the priority of the request

• It indicates the size of the message body

• It specifies the type of data being sent

How is the success of the data transmission verified?

• By checking the LED status

• By observing the serial monitor output

• By using a multimeter

• By measuring the voltage