Skip to main content

Table 14 Detailed specifications of Arduino UNO

From: Building an indoor air quality monitoring system based on the architecture of the Internet of Things

Microprocessor

ATmega328

Operating voltage

5 V

Recommended input voltage

7–12 V

Critical input voltage

6–20 V

Digital I/O pin

14 pieces (6 for PWM control)

Analog input pin

6 pieces

Interrupt pin

Interrupt 0, 1 for D2 and D3

LED

Built in the 13th pin

Flash memory

32 KB, including 0.5 KB for the bootstrap program

Electrically erasable reproducible read-only memory

1 KB (ATmega328)

SPI protocol

D10, D11, D12, D13 pin

I2C communication protocol

A SDA and SCL pin

Frequency

16 MHz

IOREF pin

1 pieces