| AltSoftSerial | Software emulated serial using hardware timers for improved compatibility |
| CapacitiveSensor | Create capacitive sensors that can detect touch or proximity. |
| DmxSimple | Drive DMX controlled lights and visual effects available from DJ or theatrical suppliers. |
| DS1307RTC | Use a DS1307 Real Time Clock chip with the Time library |
| Encoder | Counts quadrature pulses from rotary & linear position encoders. |
| FreqCount | FreqCount measures the frequency of a signal by counting the number of pulses during a fixed time. |
| FreqMeasure | FreqMeasure measures the elapsed time during each cycle of an input frequency. |
| FrequencyTimer2 | Generate a frequency using Timer2 |
| ILI9341_t3 | Optimized ILI9341 (320x240 Color TFT) Display |
| LedDisplay | Print text to an Avago HCMS-29xx LED display. |
| Mahony | Helpers for MahonyAHRS algorithm |
| MsTimer2 | Run an interrupt function using Timer2 |
| NXPMotionSense | Motion sensing with NXP FXOS8700 Accelerometer & Magnetometer and NXP FXAS21002 Gyroscope. |
| OctoWS2811 | Control thousands of WS2812B / NeoPixel LEDs at video refresh speeds |
| OneWire | Access 1-wire temperature sensors, memory and other chips. |
| PS2Keyboard | Use a PS/2 Keyboard for input |
| PulsePosition | Send and receive multiple high resolution PPM encoded signal streams. |
| PWMServo | Control RC Servo motors. |
| SerialFlash | Access SPI Serial Flash memory with filesystem-like functions |
| Time | Timekeeping functionality for Arduino |
| TimeAlarms | Perform tasks at specific times or after specific intervals. |
| TimerOne | Use hardware Timer1 for finer PWM control and/or running an periodic interrupt function |
| TimerThree | Use hardware Timer3 for finer PWM control and/or running an periodic interrupt function |
| Tlc5940 | Use the Texas Instruments TLC5940 16-channel LED Driver |
| XPT2046_Touchscreen | Touchscreens using the XPT2046 controller chip. |