Python Class for Reading Single Edge Nibble Transmission (SENT) using the Raspberry Pi

A full description of this Python script is described at www.surfncircuits.com in the blog entry: Implementing a Single Edge Nibble Transmission (SENT) protocol in Python for the Raspberry Pi Zero

This python library will read a Raspberry Pi GPIO pin connected. Start the pigpiod daemon with one microsecond sampling to read SENT transmissions with three microsecond tick times.

To start the daemon on Raspberry Pi

• sudo pigpiod -s 1

SENT packet frame summary

• Sync Pulse: 56 ticks
• 4 bit Status and Message Pulse: 17-32 ticks
• 4 bit (9:12) Data1 Field: 17-32 ticks
• 4 bit (5:8) Data1 Field: 17-32 ticks
• 4 bit (1:4) Data1 Field: 17-32 ticks
• 4 bit (9-12) Data2 Field: 17-32 ticks
• 4 bit (5-8) Data2 Field: 17-32 ticks
• 4 bit (1-4) Data2 Field: 17-32 ticks
• 4 bit CRC: 17-32 ticks

requirements

pigpiod library required

To run the script for a signal attached to GPIO BCD 18 (pin 12)

• python3 sent_READ.py