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