From: Building an indoor air quality monitoring system based on the architecture of the Internet of Things
Microprocessor | ATmega328 |
---|---|
Operating voltage | 5Â 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 | 32Â KB, including 0.5Â KB for the bootstrap program |
Electrically erasable reproducible read-only memory | 1Â KB (ATmega328) |
SPI protocol | D10, D11, D12, D13 pin |
I2C communication protocol | A SDA and SCL pin |
Frequency | 16Â MHz |
IOREF pin | 1 pieces |