This set of Arduino Questions and Answers focuses on “ESP8266 Wifi Module”.
1. What is the use of the ESP8266 WiFi Module?
a) Monitors Motion
b) Evaluates air pressure
c) Network Provider
d) Switches circuits
View Answer
Explanation: The ESP8266 WiFi Module is basically a network provider module which helps your micro-controller to connect to any WiFi network in the vicinity.
2. How many pins are present in the ESP8266 WiFi Module?
a) 12
b) 10
c) 8
d) 50
View Answer
Explanation: The ESP8266 WiFi Module has 8 pins which includes the GPIO-0, GPIO-1, RX, TX, Vcc, GND and CH_EN. All these pins have very specific functions and input patterns which need to be connected in perfect order in order for the module to function properly.
3. What is the use of the TX pin?
a) Upload
b) Download
c) Ground
d) Power input
View Answer
Explanation: The TX pin is used for connecting to RX pin of programmer micro-controller to upload the program usually. It can also be used as a general purpose Input/output pin.
4. What will happen if we supply a voltage of 250 kV to the Vcc of the ESP8266 WiFi Module?
a) Damage is caused
b) Module will shut down
c) Module will not respond for the time the voltage is applied
d) Module will function normally
View Answer
Explanation: The ESP8266 WiFi Modules are mostly built to work on a voltage of approximately 3.3V. Any voltage lower than that and the sensor will not be able to power on, but however any voltage significantly above that and the sensor may suffer permanent damage.
5. What is the maximum source current that is required to operate the ESP8266 WiFi Module?
a) 28 A
b) 12 mA
c) 100 mA
d) 1 A
View Answer
Explanation: The source current rating on the ESP8266 WiFi Module is given so that users can know what is the maximum value of the IO Source Current in the module such that the internal electronics is not destroyed by excess current supplied.
6. What is the optimum supply current that is required to operate the ESP8266 WiFi Module?
a) 28 A
b) 13 mA
c) 100 mA
d) 1 A
View Answer
Explanation: The current rating on the ESP8266 WiFi Module is given so that users can know what is the optimum current that needs to be fed to the module such that the internal electronics is not destroyed by excess current.
7. What kind of device is the ESP8266 WiFi Module?
a) Passive Sensor
b) Active Sensor
c) Networking Device
d) Switching Device
View Answer
Explanation: The ESP8266 WiFi Module is a networking device since it’s main function in any system is to be able to connect to any nearby WiFi network for uploading or downloading data hence enabling IOT.
8. What is the type of waves that the ESP8266 WiFi Module detects?
a) Infrared Signal
b) Radio Signal
c) DC Signal
d) Hybrid Signal
View Answer
Explanation: The ESP8266 WiFi Module detects WiFi and connects to the network. Since WiFi is a kind of radio frequency signal so the main purpose is to detect signals that fall into that kind of frequency range on the spectrum.
9. What mode does the ESP8266 WiFi Module switch to when fed the sequence 1 1 to its GPIO-0 and GPIO-2 Pins?
a) UART Mode
b) Sleep Mode
c) Active Mode
d) Flash Mode
View Answer
Explanation: UART Mode gives the correct combination of input needed for the module to run the program that is already uploaded to the module.
10. What mode does the ESP8266 WiFi Module switch to when fed the sequence 0 1 to its GPIO-0 and GPIO-2 Pins?
a) UART Mode
b) Sleep Mode
c) Active Mode
d) Flash Mode
View Answer
Explanation: UART Mode gives the correct combination of input needed for the module to program using Arduino or any serial communication supplied to it externally.
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