The new SparkFun STM32 Thing Plus has high-performance Arm® Cortex®-M4 32-bit RISC core, a full set of DSP instructions, memory protection unit (MPU), high-speed embedded memories, up to 4 Kbytes of backup SRAM, and an extensive range of enhanced I/Os and peripherals and more in the popular, Feather-compatible Thing Plus form factor.