#pwm #teensy4 #pixhawk adc arduino ports audio audio board audio shield cable convolutional neural net d/a a/d ..clock reference delay dma embedded embedded system farming feedback fft freertos ground hardwareserial header files heating host host cable hub humidity i2c interface interrupts lcd macos matlab microphones midi motor thunderstruck music music optocoupler pc817 optoisolator pc817 ota phoneme phonetic ports power radio radio control resolved 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 teensyduino teesny4.1 temperature thread timeout tts usb hid ventilation volume wire