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What about using I2C with this board, "Adafruit LTC4311 I2C Extender" ? https://learn.adafruit.com/adafruit-ltc4311-i2c-extender-active-terminator?view=all

I also suggest using a low power MOSFET to power the RFM95, so you can turn it off when Teensy is running and there is no need to communicate.

FilipeFlop store had good price for Teensy 3.2, etc, in the last weeks, during a promotional period.

Similar idea, implemented on Pyboard D SF2/3/6 : https://store.micropython.org/product/PYBD-SF2-W4F2

MicroPython on Teensy 3.x doesn't support : DAC, I2C, SPI, etc. The most complete option is CircuitPython (a little bit different from MicroPython) on Teensy 4.0/4.1 : https://circuitpython.org/board/teensy40/ https://circuitpython.org/board/teensy41/

The last updated MicroPython firmware for Teensy 3.2, with many features, is the "teensy-rtc" branch dhlands MicroPthon fork : https://github.com/dhylands/micropython/tree/teensy-rtc/teensy You are right, there is no internal file system in MicroPython on Teensy 3.2. So you can test MicroPython...

See this topic, Teensy 3.x/4.0 CoreMark, Temperature and Power Benchmark, e. g. : - Teensy 4.0 @ 24 MHz, i = 35 mA; - Teensy 4.0 @ 1008 MHz, i = 249 mA.

Look at the Teensy 4.0 Schematic for the names of pins A0, A1, A2, etc : ================================= IOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B1_07 = 0xb0; // A2 IOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B1_06 = 0xb0; // A3 IOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B1_09 = 0xb0; // A9 =================================

Was this keeper mode fixed (turned off for ADC) in Teensyduino 1.52 ? As its change log cites : Does low power ADC mode has keeper on, and standard ADC mode has keeper off ?

Teensy LC @ < 24 MHz should be an excellent MCU for low power applications (without USB serial, using battery) in active mode (and also in deepsleep mode). This benchmark shows i <= 2.0 mA on Teensy 3.2/3.5/3.6, so on Teensy LC it would problably run with less current. So, please implement...

Benchmark comparing performance (CoreMark), temperature (from internal MCU sensor) and power usage (electrical current i using USB serial meter) for Teensy 4.0/3.6/3.5/3.2/LC : Teensy 3.x/4.0 CoreMark, Temperature and Power Benchmark It is useful to help decide which Teensy 3.x/4.x is better...

Thanks @tannewt for the detailed answer. Excellent, the microSD can work with the Adafruit_CircuitPython_SD library, and the community can develop drivers to access PSRAM and/or flash external IC's via SPI interface. Together with more internal flash memory (as file system) and more exposed...

I don't yet have a Teensy 4.1, just Teensy 4.0. Any new feature of Teensy 4.1 (with respect Teensy 4.0) is implemented in CircuitPython 5.4.0-beta.0 for Teensy 4.1 ? - internal 8MB flash memory seems recognized, with 7MB as file system, from post #93; - all additional pins (to be confirmed); -...

Or zip the file (.zip is accepted).

Thanks for the CircuitPython for Teensy 4.0 v2020-01-19. The benchmarks show that it's as fast as v2020-01-18. The REPL is better (no bugs until now). But the the same pystone benchmark (see attached file) works ok on firmware v2020-01-10 : Adafruit CircuitPython...

The latest (2nd) firmware from @tannewt is a lot faster than the 1st one : - performanceTest with firmware CircuitPython 5.0.0-beta.3-6-g926375d99-dirty on 2020-01-10 @ Teensy 4.0 : 300871 - performanceTest with firmware CircuitPython 5.0.0-beta.3-69-g1c3960634 on 2020-01-18 @ Teensy 4.0 ...

Done (3rd one is a new issue) : - microcontroller.cpu.temperature doesn't work on Teensy 4.0 #2514; - REPL disconnects in paste mode with >= 4 lines on Teensy 4.0 #2515; - ampy doesn't work with Teensy 4.0 #2516.

Bugs so far : - CircuitPython halts after : import microcontroller microcontroller.cpu.temperature - REPL disconnects after pasting more than approx. 4 lines in paste mode (CTRL+E). I have to disconnect from the USB port and connect to REPL work again.

Thanks for this 1st image of CircuitPython for Teensy 4.0 ! First tests : $ screen /dev/ttyACM0 Auto-reload is on. Simply save files over USB to run them or enter REPL to disable. Press any key to enter the REPL. Use CTRL-D to reload. Adafruit CircuitPython 5.0.0-beta.3-6-g926375d99-dirty on...

CircuitPython 5.0.0-beta.3 was released to Feather MIMXRT1062. But the firmware is in .uf2 format. How to use an .uf2 firmware on Teensy 4.0 ? AFAIK, Teensy Loader CLI needs .hex firmwares.