Source: https://mokxi.com/libraries
Updated: 2026-11-02

Arduino libraries

# Arduino libraries with examples that run in your browser

446 Arduino libraries are built into Mokxi, so a sketch that includes one compiles with nothing to install. These 100 have a page of their own: the calls a sketch uses, the wiring, the errors people hit and an example that opens in the editor and runs.

Find a library

No library page matches that. The editor’s library browser lists every built-in library.

## Motion

- Servo Servo.h Attach, write, writeMicroseconds, read and detach, on any pin
- Stepper Stepper.h SetSpeed and step for the 28BYJ-48 and its ULN2003 board
- AccelStepper AccelStepper.h Acceleration and speed for steppers on a driver, two, three or four wires, or the sketch’s own step functions, and MultiStepper to move several together
- Adafruit PWM Servo Driver Library Adafruit_PWMServoDriver.h The PCA9685’s sixteen PWM channels, for servos and LEDs
- Adafruit Motor Shield V2 Library Adafruit_MotorShield.h Four DC motors or two steppers through the V2 shield’s PCA9685 and TB6612s
- L298N L298N.h DC motors on an L298N: setSpeed(), forward(), backward(), stop() and the non-blocking forwardFor()

## Core

- Wire Wire.h I2C as a master on the board’s usual SDA and SCL pins
- SPI SPI.h Transfer and transactions on the board’s usual SPI pins
- EEPROM EEPROM.h Read, write, update, get, put and EEPROM[i]
- FreeRTOS (Arduino_FreeRTOS) Arduino_FreeRTOS.h Tasks with stacks of their own that delay and wait on queues, semaphores, mutexes and task notifications, with loop() as the idle task

## Communication

- SoftwareSerial SoftwareSerial.h A serial port on any two pins, for the HC-05, the GPS module, and RS-485 or RS-232 through a MAX485 module or a MAX232
- OneWire OneWire.h The 1-Wire bus: reset, search, read and write, CRC8
- MFRC522 MFRC522.h RFID cards: the UID, blocks read and written, value blocks, access bits, the magic-card UID calls and NTAG216 passwords
- RF24 RF24.h NRF24L01 radios: pipes, acknowledgments and payloads between boards, the IRQ flags, and the examples’ printf.h
- LoRa LoRa.h SX1276/77/78 LoRa radios (Ra-02, RFM95W): packets between boards, polled or on DIO0, the spreading factor, bandwidth, sync word and CRC, and channel activity detection
- RadioLib RadioLib.h The SX127x LoRa classes (SX1276, SX1278, RFM95, RFM96): transmit and receive, blocking or on DIO0, scanChannel and the modem settings
- TinyGPSPlus TinyGPS++.h NMEA sentences parsed into location, date, time, speed and satellites, and TinyGPSCustom for any other field
- BluetoothSerial (ESP32 core) BluetoothSerial.h The classic ESP32’s Bluetooth serial port, SerialBT.begin("name"), the Stream calls, SSP pairing and register_callback() for SPP events
- DFRobotDFPlayerMini DFRobotDFPlayerMini.h The DFPlayer Mini MP3 module over serial: play, volume, folders and the replies
- BLE (ESP32 core) BLEDevice.h Bluetooth LE servers, services, characteristics, advertising and scans, as the ESP32 BLE tutorials write them
- I2S (ESP32 core and ESP-IDF) ESP_I2S.h Standard (Philips and MSB) I2S in and out on any GPIO: I2SClass from ESP_I2S.h, the core 2.x I2S object, and the ESP-IDF legacy and standard-mode drivers, for I2S microphones and amplifiers
- TinyGPS TinyGPS.h TinyGPS++’s predecessor: encode(), f_get_position(), crack_datetime() and the speeds
- Keyboard Keyboard.h The ATmega32U4 as a USB keyboard: Keyboard.begin(), print(), press() and releaseAll()
- Mouse Mouse.h The ATmega32U4 as a USB mouse: Mouse.move(), click(), press() and release()
- Arduino Joystick Library Joystick.h The ATmega32U4 as a USB game controller: buttons, axes and hat switches
- MIDI Library MIDI.h MIDI messages on a serial port: sendNoteOn() and the rest, read() with handlers, Thru, SysEx, RPN and NRPN, chained calls and custom transports
- ModbusMaster ModbusMaster.h A Modbus RTU master: readHoldingRegisters(), writeSingleRegister() and the rest, with the CRC checked and the RS-485 direction callbacks
- i2cdetect i2cdetect.h I2cdetect() prints the Linux i2cdetect table of the addresses that answer, to Serial
- AltSoftSerial AltSoftSerial.h A second serial port on upstream’s fixed pins: RX 8 and TX 9 on the Uno, Nano and Pro Mini, 48 and 46 on the Mega, 13 and 5 on the Leonardo

## Data and time

- SD SD.h Files on a FAT16 card: open, print, read, exists, remove, mkdir and directory listings, and the CardInfo example’s Sd2Card, SdVolume and SdFile
- RTClib RTClib.h The DS3231 and DS1307 clocks, with DateTime, TimeSpan, the DS3231’s alarms, and RTC_Millis and RTC_Micros
- TimerOne TimerOne.h Timer1 as a periodic interrupt, and PWM of any period on its pins
- MsTimer2 MsTimer2.h A function every so many milliseconds, from Timer2
- Low-Power LowPower.h PowerDown, idle and the other sleeps, for a period or until an interrupt
- ArduinoJson ArduinoJson.h JSON and MessagePack in and out: JsonDocument (and the 6.x Static and Dynamic documents, and the 5.x StaticJsonBuffer with parseObject() and printTo()), serializeJson and deserializeJson from text, a String, a Stream or a File, with the Filter option and serialized()
- Time TimeLib.h A clock in software: setTime, now, hour, minute, makeTime, breakTime and a sync provider
- DS1307RTC DS1307RTC.h RTC.get, RTC.read and RTC.set on a DS1307 (or DS3231), with TimeLib.h
- Preferences (ESP32 core) Preferences.h Named settings by key: putUInt, getString, putBytes and the rest, in namespaces
- I2C_EEPROM I2C_eeprom.h A 24LC256 or AT24C EEPROM: writeByte, writeBlock across pages, readBlock, objects, the verify calls, determineSizeNoWrite and the cyclic store
- DS3231 (NorthernWidget) and DS3231 (Rinky-Dink Electronics) DS3231.h The DS3231 clock: getHour(h12, pm), RTClib::now() and alarms, or getTimeStr(), getDateStr() and setTime()
- QRCode qrcode.h QR codes of versions 1 to 40 at the four error correction levels, read module by module to draw
- Timezone Timezone.h Local time from UTC with daylight-saving rules: TimeChangeRule, toLocal(), toUTC() and utcIsDST()
- SdFat SdFat.h SdFat and SdFs with begin(SdSpiConfig), File32 and FsFile with open(), println(), fileSize() and close(), and ls()
- PID PID_v1.h The PID controller of the temperature, speed and balance tutorials: Compute(), SetTunings() and SetOutputLimits()
- Arduino_JSON Arduino_JSON.h JSONVar, JSON.parse(), JSON.stringify() and JSON.typeof(), as the ESP32 web tutorials use them
- Ticker Ticker.h Callbacks every interval, a number of times or for ever, from update() in loop(): start(), pause(), resume(); on the ESP32 and ESP8266 boards also the cores’ own Ticker, attach(seconds, function), once() and detach()
- Madgwick MadgwickAHRS.h Madgwick’s orientation filter: begin(rate), updateIMU() or update() with a magnetometer, then getRoll(), getPitch() and getYaw()

## Displays

- LiquidCrystal LiquidCrystal.h The 16x2 and 20x4 character LCD on six (or ten) wires, every kit’s first display
- LiquidCrystal I2C LiquidCrystal_I2C.h The character LCD behind its PCF8574 I2C backpack
- Adafruit GFX Library Adafruit_GFX.h Text in the built-in font or a GFXfont, pixels, lines, rectangles, circles, ellipses, triangles, bitmaps, canvases and buttons on every Adafruit display
- Adafruit SSD1306 Adafruit_SSD1306.h The 128x64 and 128x32 I2C OLEDs
- U8g2 U8g2lib.h SSD1306, SSD1309, SH1106, SH1107 and PCD8544 displays: full and page buffers in upstream's layout, shapes, bitmaps, text in four directions, buttons, U8x8, the logs and the user interface screens
- Adafruit ILI9341 Adafruit_ILI9341.h The 2.8 inch 320x240 SPI TFT
- GxEPD2 GxEPD2_BW.h The 2.13 and 2.9 inch black and white e-paper panels, drawn in pages
- LedControl LedControl.h MAX7219 8x8 matrices and eight-digit displays
- TFT_eSPI TFT_eSPI.h ILI9341, ST7789, ST7735, GC9A01, ILI9488 (18-bit color, as upstream sends it over SPI) and ST7796 TFTs: shapes, anti-aliased arcs, circles and wide lines, the numbered, free and smooth (.vlw) fonts, viewports, sprites at 1, 4, 8 and 16 bits with rotation, buttons and XPT2046 touch
- MD_MAX72XX MD_MAX72xx.h Chains of 8x8 matrix modules: points, columns, rows, lines, characters in upstream’s font tables, shifts and transforms
- TM1637 TM1637Display.h The four-digit clock display: numbers, the colon, raw segments and brightness
- SevSeg SevSeg.h A multiplexed seven-segment display straight from the pins: numbers, decimals and letters
- U8glib U8glib.h U8g2's predecessor, as older OLED tutorials use it: SSD1306, SSD1309, SH1106 and PCD8544 constructors, the firstPage() and nextPage() loop, shapes, bitmaps, text in four directions, the cursor and the color calls
- hd44780 hd44780.h The extensible LCD library: hd44780_I2Cexp finds the backpack’s address itself, and hd44780_pinIO drives a bare module
- LCD_I2C LCD_I2C.h The I2C LCD as LCD_I2C lcd(0x27, 16, 2), begin() and backlight()

## Input

- XPT2046_Touchscreen XPT2046_Touchscreen.h The resistive touch layer on the ILI9341, ILI9488 and ST7796 modules
- Adafruit MCP23017 Arduino Library Adafruit_MCP23X17.h Sixteen more pins over I2C, and the eight-pin MCP23008’s class
- CapacitiveSensor CapacitiveSensor.h Touch sensing with a send pin, a resistor and a receive pin, the library’s own count
- Keypad Keypad.h Matrix keypads: getKey, several keys at once, hold and release events
- IRremote IRremote.h Every protocol of IRremote 4.6, received and sent (NEC, Samsung, Sony, RC5, RC6, Panasonic, LG, JVC, Denon and the rest), the universal pulse distance decoder, the printouts, TinyIR, the command dispatcher and the 2.x irrecv.decode(&results)
- Encoder Encoder.h Quadrature encoder counts, four per cycle, on interrupts where the pins have them
- OneButton OneButton.h Click, double click, multi click and long press from one button, and the reduced OneButtonTiny class
- PCF8574 (Rob Tillaart) and PCF8574 library (Renzo Mischianti) PCF8574.h Eight more pins over I2C: read8, write and toggle, or pinMode, digitalWrite and digitalRead on P0 to P7
- RotaryEncoder RotaryEncoder.h A rotary encoder polled with tick(): getPosition(), getDirection() and the three latch modes
- CD74HC4067 CD74HC4067.h CD74HC4067 mux(s0, s1, s2, s3) and channel(n), to read sixteen inputs on one analog pin

## LEDs

- Adafruit NeoPixel Adafruit_NeoPixel.h WS2812 strips, rings and panels
- FastLED FastLED.h CRGB arrays and CRGBArray sets, CHSV, palettes, fill_rainbow, noise, HeatColor, beatsin8, EVERY_N_MILLISECONDS and RGBW strips
- Arduino_LED_Matrix (Uno R4 core) Arduino_LED_Matrix.h The Uno R4 WiFi’s 12 by 8 LED matrix: frames, renderBitmap and sequences

## Sensors

- DHT sensor library DHT.h The DHT11 and DHT22: temperature, humidity and the heat index, and DHT_Unified
- DallasTemperature DallasTemperature.h DS18B20 thermometers, any number on one pin
- Adafruit BMP280 Library Adafruit_BMP280.h Temperature, pressure and altitude
- Adafruit MPU6050 Adafruit_MPU6050.h Acceleration in m/s², rotation in rad/s and temperature, as unified sensor events
- MPU6050 MPU6050.h The raw accelerometer and gyro counts, ranges and offsets
- Adafruit INA219 Adafruit_INA219.h Current, bus voltage and power
- Adafruit ADS1X15 Adafruit_ADS1X15.h The ADS1115’s four 16-bit inputs, single or differential
- HX711 Arduino Library HX711.h The load cell amplifier: tare, set_scale and get_units
- BH1750 BH1750.h Ambient light in lux
- MAX6675 library max6675.h A K-type thermocouple in Celsius or Fahrenheit, NAN when the probe is open
- VL53L0X VL53L0X.h Time-of-flight distance in millimeters, single or continuous
- Adafruit_VL53L0X Adafruit_VL53L0X.h Time-of-flight distance with rangingTest(), readRange() and startRange(), continuous ranging, the sensing profiles and the new-measurement interrupt on GPIO1
- Ultrasonic Ultrasonic.h HC-SR04 distance in centimeters or inches, on two pins or one
- NewPing NewPing.h HC-SR04 distance in centimeters or inches, and the median of several pings
- ADS1X15 ADS1X15.h ADS1115 ADS(0x48): readADC(), the differential reads, setGain(), toVoltage() and requestADC() with isReady()
- BME280 BME280I2C.h BME280I2C: read(pres, temp, hum, ...) in any unit, the settings, and EnvironmentCalculations’ altitude, dew point and heat index
- DHT20 DHT20.h The I2C DHT20: begin(), read(), getHumidity() and getTemperature(), or requestData() and readData() in steps
- ACS712 ACS712.h An ACS712 current sensor’s output in milliamps: ACS712 ACS(A0, 5.0, 1023, 185), autoMidPoint(), mA_DC(), mA_AC() and mA_peak2peak()
- ZMPT101B ZMPT101B.h The ZMPT101B AC voltage sensor’s RMS voltage: ZMPT101B sensor(A0, 50.0), setSensitivity() and getRmsVoltage()

## Network

- WiFi, HTTPClient and WebServer (ESP32 core) WiFi.h Join the simulated access point, fetch pages with HTTPClient and serve the editor’s Web panel with WebServer or WiFiServer
- PubSubClient PubSubClient.h MQTT publish and subscribe over a WiFiClient
- ThingSpeak ThingSpeak.h WriteField(), setField() with writeFields(), and the read calls, as HTTP requests
- Blynk BlynkSimpleEsp8266.h Blynk.begin(), run(), virtualWrite(), syncVirtual(), logEvent(), BLYNK_WRITE with param, BLYNK_CONNECTED, BlynkTimer and the LED, terminal and LCD widgets, on a simulated Blynk server
- MQTT MQTT.h MQTTClient: begin(), connect(), publish(), subscribe() and loop()
- WiFiManager WiFiManager.h AutoConnect(), startConfigPortal(), WiFiManagerParameter and the settings calls

## Every library, already installed

All 446 built-in libraries are in the editor’s library browser, each with an example to open.

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