Hello,
Guys I am looking for a RTOS library that will run on Teensyduino.
If this is a Cortex-M device (M0, M0+, M3, M4, M7, M23, M33) then you can use FreeRTOS. How much RAM you need depends on how many tasks you create as each task needs its own stack.
Google tells it’s a Cortex-M4 so that’s possible and others already did something pretty similar: