I had need of a portable serial data logger for proof of concept of a supplementary data logger for an APRS tracker.
The requirement is to capture RS232-TTL data at 4800bps, 8N1 to a data file for later extraction. The logger needs to restart automatically and append new records to the existing file.
A spare Raspberry Pi2 was applied to the job as a headless data logger.
Above is the RPi2 with an inexpensive FTDI USB/RS232-TTL adapter. Only the ground and RD wires attach to the modified TinyTrak. Continue reading A cheap and cheerful data logger