Module 2: Understanding Sensors | OceanRemote Education

1 What are sensors described as in IoT systems?

A) The brain of the system B) The eyes and ears of IoT C) The power source D) The internet connection

2 Which soil moisture sensor type lasts YEARS without corrosion?

A) Resistive sensor B) Capacitive sensor C) Electrode sensor D) Metal probe sensor

3 What is the key difference between analog and digital sensors?

A) Analog sensors are wireless, digital sensors are wired B) Analog sensors give a range of values, digital sensors give ready-to-use values C) Analog sensors are more accurate, digital sensors are less accurate D) Analog sensors only work with ESP32, digital sensors work with any board

4 Which sensor measures both temperature AND humidity?

A) DS18B20 B) BMP280 C) DHT22 D) Soil moisture sensor

5 What is the recommended starting sensor set for a farm IoT system?

A) 10 expensive sensors B) Soil moisture + DHT22 + Rain sensor C) Only temperature sensor D) Only light sensor

6 Why do DHT22 and DS18B20 sensors need pull-up resistors?

A) To increase voltage B) To prevent short circuits C) To work properly with the microcontroller D) To save power

7 How many sensors can one ESP32 typically connect to?

A) 1-2 sensors maximum B) 5 sensors maximum C) 10+ sensors simultaneously D) 50+ sensors maximum