ESP32 Quiz 1 / 60What UUIDs are used for in BLE communication? Identify devices on Wi-Fi Set device frequency Define services and characteristics Create random values 2 / 60What is the default Wi-Fi mode of ESP32 when it powers up? STA mode OFF AP+STA mode AP mode 3 / 60What is the purpose of a DAC in ESP32? Digital signal amplification Reset pin values Convert digital to analog signals Data access control 4 / 60What is the typical range of Wi-Fi for ESP32 in open space? 10–20 meters 1 km 200–300 meters 50–100 meters 5 / 60Which pins should be avoided during boot because they affect the boot process? GPIO 6 to GPIO 11 GPIO 2, 4, 5 GPIO 18, 19 GPIO 21, 22 6 / 60Which library is used in Arduino IDE to connect ESP32 to Wi-Fi? WiFi.h WiFiClient.h ESP32WiFi.h Ethernet.h 7 / 60What peripheral is used to convert analog input to digital values? SPI ADC DAC PWM 8 / 60Which library is commonly used for Classic Bluetooth in Arduino IDE? BluetoothSerial.h BLEDevice.h WiFiSerial.h BluetoothClassic.h 9 / 60What constant indicates a successful connection in WiFi.status()? WL_CONNECTED ONLINE CONNECTED OK 10 / 60What is the role of a "BLE Server" on ESP32? It connects to Wi-Fi networks It connects to other devices and receives data It stores data in flash It advertises services and sends data to clients 11 / 60Which function initializes the serial communication? Serial.init() Serial.begin() Serial.start() Serial.read() 12 / 60What is the resolution of the ADC in ESP32 by default? 8-bit 10-bit 16-bit 12-bit 13 / 60Which function turns an output pin HIGH or LOW in Arduino-style code for ESP32? setPin() writePin() digitalWrite() pinOutput() 14 / 60What is the maximum clock speed of the ESP32-WROOM-32? 240 MHz 80 MHz 160 MHz 120 MHz 15 / 60How many GPIO pins are typically available on the ESP32 DevKit board? 54 10 20 34 16 / 60What is the core processor used in ESP32-WROOM-32? AVR RISC-V ARM Cortex-M3 Xtensa LX6 17 / 60What tool is used for professional development with ESP32 (official SDK)? Arduino Core PlatformIO Core ESP-IDF ESP-Terminal 18 / 60What is the default operating voltage of the ESP32-WROOM-32 module? 12V 3.3V 1.8V 5V 19 / 60What is the maximum number of BLE connections ESP32 can typically support as a server? 7 4 1 3 20 / 60Which function is used to generate PWM signals on a GPIO pin in Arduino? analogWrite() digitalPWM() pwmOut() setPWM() 21 / 60What is the typical range of BLE communication for ESP32? 100–200 meters 10–30 meters 500 meters 5–10 meters 22 / 60Which command reads the value of a digital input pin? getPinValue() digitalRead() readInput() inputRead() 23 / 60Which library is used to implement BLE on ESP32? BLEDevice.h BluetoothLowEnergy.h BLESerial.h ESPBLE.h 24 / 60Which communication interfaces does ESP32-WROOM-32 support? SPI, RS485, Ethernet UART, SPI, I2C USB, RS232, VGA UART, HDMI, PCIe 25 / 60What keyword is used to define a constant pin number? const int static pinDef define 26 / 60On Windows, where can you check if the CP2102 driver is installed correctly? Registry Editor Task Manager File Explorer Device Manager 27 / 60Which USB driver is usually required for ESP32 on Windows? CH340 or CP210x USB to UART driver FTDI FT232R GPIO bridge driver Arduino AVR driver 28 / 60Which pins on the ESP32 can be used for touch sensing? Only GPIO 13 Touch-capable GPIOs (e.g., T0 to T9) GPIO 0 to 10 GPIO 32 to 39 29 / 60Which IDE is most commonly used by beginners for ESP32 development? Arduino IDE VS Code Code::Blocks Eclipse 30 / 60What types of Bluetooth are supported by ESP32? None Both Classic and BLE BLE only Classic only 31 / 60What does BLE stand for? Bluetooth Light Edition Bluetooth Long-range Extension Bluetooth Low Energy Basic Low Energy 32 / 60How can you install ESP32 board support in Arduino IDE? It is built-in automatically Using the Board Manager URL By downloading an EXE installer Through Tools > Manage Libraries 33 / 60What is the correct baud rate commonly used for ESP32 serial communication? 250000 4800 9600 115200 34 / 60What problem can occur if the CP2102 driver is not installed on a computer? The ESP32 will not be recognized by the computer The Wi-Fi module will not work ESP32 will not power on The ESP32 will overheat 35 / 60How do you print text to the Serial Monitor in ESP32 Arduino code? Serial.println("text") console.log("text") print("text") monitor.write("text") 36 / 60What is the function of the CP2102 chip in ESP32 development boards? It provides USB-to-Serial communication It converts 5V to 3.3V It manages Wi-Fi connectivity It controls GPIO pins 37 / 60Which driver is required for the CP2102 chip on Windows systems? Arduino USB Driver CH340 Driver FTDI Driver CP210x USB to UART Bridge VCP Driver 38 / 60If the ESP32 board is not detected on Linux, which command can help check connected USB devices? usbconfig Both A and C lsusb dmesg | grep serial 39 / 60What data type is commonly used to store HIGH or LOW? byte bool boolean int 40 / 60How many ADC channels are available on the ESP32? 3 32 10 to 18(depends on chip variant) 2 41 / 60What function is used to set the mode of a GPIO pin in ESP32? gpioMode() definePin() setPinMode() pinMode() 42 / 60What is the purpose of setup() in ESP32 Arduino code? Runs the main loop repeatedly Initializes code and runs once Sets up the display Delays execution 43 / 60Which of the following can ESP32 act as? Wi-Fi Station Both A and B Neither A nor B Wi-Fi Access Point 44 / 60How do you get the IP address of ESP32 after connecting to Wi-Fi? WiFi.myIP() WiFi.localIP() WiFi.getIP() WiFi.IP() 45 / 60Which platform is used to manage ESP32 code with a modern interface and multiple boards? GitHub Notepad++ PlatformIO Tinkercad 46 / 60Which company manufactures the ESP32 chip? Microchip Espressif Systems Atmel Intel 47 / 60Which company manufactures the ESP32-WROOM-32 module? Atmel Espressif Systems Microchip Texas Instruments 48 / 60What is the maximum voltage ESP32 GPIO pins can tolerate? 3.3V 12V 5V 1.8V 49 / 60Which app is commonly used to test BLE communication on a smartphone? Arduino Bluetooth Serial Monitor nRF Connect ESP BLE Controller 50 / 60Which file is used to configure board settings in Arduino IDE for ESP32? boards.txt setup.ini board_config.json platform.ini 51 / 60What must be installed in Arduino IDE to program the ESP32? Java SDK Bluetooth driver Python interpreter ESP32 Board Support Package 52 / 60Which function checks if ESP32 is connected to Wi-Fi? WiFi.connected() WiFi.status() WiFi.check() WiFi.signal() 53 / 60What is the purpose of delay(1000); in ESP32 Arduino code? Waits for user input Turns off power for 1000 ms Waits for 1000 milliseconds Reads pin 1000 54 / 60Which ESP32 function sets the duty cycle for PWM output? analogWrite(pin, value) setDutyCycle(pin, value) pwmSet(pin, value) digitalWrite(pin, HIGH) 55 / 60What is the purpose of the "Boot" button on ESP32 boards? It enters firmware upload mode It resets Wi-Fi settings It opens the serial monitor It opens a menu 56 / 60What does the loop() function do? Repeats code continuously Declares variables Executes only once Uploads code 57 / 60What is the function to create a Wi-Fi access point? WiFi.softAP() WiFi.startAP() WiFi.apStart() WiFi.apBegin() 58 / 60What function is used to disconnect from Wi-Fi in ESP32? WiFi.shutdown() WiFi.end() WiFi.stop() WiFi.disconnect() 59 / 60What function is used to connect ESP32 to a Wi-Fi network? WiFi.attach() WiFi.connect() WiFi.link() WiFi.begin() 60 / 60In BLE, what is the purpose of a "Characteristic"? Used to identify the device Stores Wi-Fi credentials Assigns power levels Transfers data between server and client Your score isThe average score is 63% 0% Restart quiz
