Hardware

Question 1

Which communications protocol does the Arduino board use?

Answer 1

The Tx and the Rx pins can be used for UART communication, but with a library it is possible to use all the other pins for UART also. There is also A4 and A5 that are SDA and SCL pins, so you can use I2U as well.

Question 2

Which are the PWM pins?

Answer 2

The ones with a ~ symbol.

Question 3

What does the crystal oscillator on the board do?

Answer 3

It gives the board ability to keep track of time, generate PWM and do serial communication. It oscillates at 16MHz which means it can execute binary instructions at 16 million times per second

Question 4

Which microcontroller does the board have?

Answer 4

ATMEGA328

Question 5

What minimum resistance can you connect in a circuit?

Answer 5

The maximum current the arduino can offer is 20mA (= 0.02A). If you have the circuit connected to 5V it gives by Ohms law R = 250 (the 220 resistance is ok as well). If you connect it to the 3.3V it gives R = 165 Ohm.

Question 6

Whats the difference between a 1/8 W resistor and a 1/4W?

Answer 6

The 1/8W can tolerate that much Watts. So you need to know how much current will go through it and also how high voltage will be over it.

Question 7

How does a button work?

Answer 7

When you press it, the circuit gets connected and current can flow through it