Nerd Notes going over changes in Hardware Design Revisions.
REMs
– REM II + v5.0
Launched August 2018
Revision Announcement
85% Progress Update
Full Design Change Log
Initial Bug Report
Additions:
- Teensy 3.2 Architecture fully embedded into main board
- 5v Switching Regulator to combat heat issues of previous underpowered linear design
- In/Out System overhaul includes more features, uses DIP switches for mode selection
- Switched to Teensys RTC system with much larger replaceable battery compared to previous finikey DS3231 modules
- Discrete Relay Driver chip for proper Fan Relay control
- Proper high side LED backlight drivers to provide max current and take load off of chip pins
- Optional 6 pin Nano-Fit MOD Jack on REM for more custom projects
- 12V Ignition analog sense line
- Proper rail-to-rail Op Amp for signal generator
- Data line buffers and current limiting added
- DMM Renix Adapter option
- Other little system tweaks
Issues:
- micro SD slot wired backwards (compact slots bodged in to work)
- backlight transistor footprint backwards
- data buffers only 5v tolerant
- experimental 12v battery switch non functional
- Relay Driver pin interfered with initial bootloader functionality
– REM II+ V5.1
Launched November 2018
– REM II+ V5.2
Launched December 2018
– REM II+ V5.3
Launched June 2020