Podcast
Questions and Answers
You are designing a smart switch using an ESP8266 NodeMCU to control a mains-powered light. Which of the following methods is the SAFEST and most appropriate for switching the high-voltage AC circuit?
You are designing a smart switch using an ESP8266 NodeMCU to control a mains-powered light. Which of the following methods is the SAFEST and most appropriate for switching the high-voltage AC circuit?
- Directly connecting a GPIO pin of the ESP8266 to the light bulb to switch it on and off.
- Using a small signal NPN transistor to directly switch the AC load. (correct)
- Connecting the AC circuit directly to the built-in ADC pin of the ESP8266 to monitor the voltage and control the light.
- Using a solid-state relay (SSR) or electromechanical relay, controlled by a GPIO pin of the ESP8266, to switch the AC circuit. (correct)
You are designing an IoT project that uses an HC-SR04 ultrasonic sensor to measure the water level in a tank. The Arduino and sensor will be located in a humid environment. Which of the following circuit design considerations is MOST important to ensure reliable and accurate sensor readings over time?
You are designing an IoT project that uses an HC-SR04 ultrasonic sensor to measure the water level in a tank. The Arduino and sensor will be located in a humid environment. Which of the following circuit design considerations is MOST important to ensure reliable and accurate sensor readings over time?
- Using the shortest possible wires to connect the sensor to the Arduino to minimize signal interference.
- Applying a conformal coating or sealant to the sensor's circuit board to protect it from moisture and corrosion. (correct)
- Using a lower operating frequency for the ultrasonic sensor to improve its penetration through humid air.
- Increasing the trigger pulse width to 20 microseconds to compensate for signal attenuation in humid conditions.
You're setting up a simple LED control project using an ESP8266 and Blynk. You connect an LED to a GPIO pin on the ESP8266. What else is essential to include in the circuit to protect the LED from burning out?
You're setting up a simple LED control project using an ESP8266 and Blynk. You connect an LED to a GPIO pin on the ESP8266. What else is essential to include in the circuit to protect the LED from burning out?
- A resistor in series with the LED. (correct)
- A capacitor in parallel with the LED.
- A diode in series with the LED, oriented to block current flow.
- A push button in series with the LED.
In a circuit using a relay to control a light bulb with an Arduino, what is the main purpose of the relay?
In a circuit using a relay to control a light bulb with an Arduino, what is the main purpose of the relay?
When connecting a relay module to an Arduino, which Arduino pins are typically used to control the relay?
When connecting a relay module to an Arduino, which Arduino pins are typically used to control the relay?
When building a circuit on a breadboard, why is it important to place the legs of an integrated circuit (IC) across the ravine (the gap in the middle of the breadboard)?
When building a circuit on a breadboard, why is it important to place the legs of an integrated circuit (IC) across the ravine (the gap in the middle of the breadboard)?
You're using a breadboard to prototype a circuit with an Arduino and several components. You need to provide power (5V and Ground) to multiple points on the breadboard. What is the best practice for distributing power efficiently and neatly across the breadboard?
You're using a breadboard to prototype a circuit with an Arduino and several components. You need to provide power (5V and Ground) to multiple points on the breadboard. What is the best practice for distributing power efficiently and neatly across the breadboard?
Flashcards
Capital of France (example flashcard)
Capital of France (example flashcard)
Paris
