Wired communications in IoT

RFID Reader

UART

• Universal Asynchrounous Receiver Transmitter
• 点对点

I2C

• Inter intrerated Circuit
• 多对多
• SCL(Serial Clock) - 串行时钟线
• SDA(Serial data) - 串行数据线
• I2C Bit Frame
  • Message

SPI

• Serial Peripheral
• 点对多(一主多从)
• SPI Bit Frame

Wireless communications in IoT

• BlueTooth
• FHSS: Frequency-Hopping spread Spectrum
• QAM: Quadrature
• Zigbee

Wireless Power from Electronmagnetic Waves

• two essential part in WPT system:
  • wireless Power Transmitter
  • receiver