Electronics Unit

Question 1

DHT

Answer 1

Digital Humitidy and Temperature Sensor.

• Measure readings via electric signals
• Contain two metals that generate electric voltage or resistance when a temperature change occurs.

P (Pin) 1: VCC
P2: Data
P3: Not connected – doesn’t need to be connected at all.
P4: Ground
1-4 go from left to right.

Libraries:
- Needs DHT library
- Needs Adafruit Unified Sensor

Question 2

Ultrasonic Distance Sensor

Answer 2

Ultrasound is high-pitched sound waves with frequencies higher than the audible limit of human hearing.
- Can report the range of objects from up to 13 feet away.

HOW IT WORKS:
- Emits high frequency sound, which finds an object, and bounces back to the module.
- The receiver (echo pin) receives this.
- The time between the transmission and the reception of the signal allows us to calculate the distance of an object.

Library:
- Needs HCSR04

PINS:
P1: VCC
P2: Trig
P3: Echo
P4: Ground

Question 3

OLED VS. LED

Answer 3

• Offers rich colors, rich contrast, deep blacks, wide viewing angle, and low power and a fast response time.
• Older LED based screens use backlighting to illuminate their pixels, while OLED’s pixels actually produce their own light.
• OLEDs are emissive
• LEDs are transmissive

OLED pins:
- Ground
- VCC
- SCL (serial clock)
synchronizing communication
- SDA (serial data)

LIBRARY:
- SSD1306Ascii

Question 4

Arduino shiels

Answer 4

Boards that can be plugged on top of the Arduino to extend it’s capabilities.

Question 5

Other terms

Answer 5

• 5x8 RGB matrix