#pwm #teensy4 #pixhawk 4.0 adc arduino ports audio audio board audio shield beamforming cable delay dma embedded embedded system farming feedback fft freertos gpio hardwareserial header files heating host cable hub humidity i2c interface interrupt lcd macos matlab microcontroller microphones midi motor thunderstruck music multichannel music optocoupler pc817 optoisolator pc817 ota phoneme port ports power resolved rpm sensing simulink speech spi stop bit teensy teensy 2.0 teensy 4 teensy 4.0 teensy4.1 teensy 4.1 teensy 4.1 eeprom teensy 4.1 poe teensy 4.x teensy41 temperature thread timeout tts usb hid usbhost ventilation volume wav mixing wire