Arduino 18 is out!

Pt 2528
Whoops, we forgot to post up about this. Arduino 18 is out! There’s improved support for 3rd party hardware, nice…

0018 – 2010.01.29

[core / libraries]

  • Added tone() and noTone() functions for frequency generation.
  • Added Serial.end() command.
  • Added precision parameter for printing of floats / doubles.
  • Incorporated latest version of Firmata.
  • Fixed bug w/ disabling use of the RW pin in the LiquidCrystal library.
  • No longer disabling interrupts in delayMicroseconds().
  • Fixed bug w/ micros() returning incorrect values from within an interrupt.
  • Fixed bug that broke use of analog inputs 8-15 on the Mega.


  • Synchronized with the Processing 1.0.9 code base, bringing various fixes, including to a bug causing saving to fail when closing the last sketch.
  • Added support for third-party hardware in the SKETCHBOOK/hardware folder, mirroring the current structure of the hardware folder in Arduino.
  • Added Ctrl-Shift-M / Command-Shift-M shortcut for serial monitor.
  • Hold down shift when pressing the Verify / Compile or Upload toolbar buttons to generate verbose output (including command lines).
  • Moving build (on upload) from the applet/ sub-folder of the sketch to a temporary directory (fixing problems with uploading examples from within the Mac OS X disk image or a Linux application directory).
  • Fixed bug the prevented the inclusion of .cpp and .h (or .c and .h) files of the same name in a sketch.
  • Improved the Mac OS X disk image (.dmg): added a shortcut to the Applications folder, a background image with arrow, and new FTDI drivers.

Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here:

Join Adafruit on Mastodon

Adafruit is on Mastodon, join in!

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Join over 36,000+ makers on Adafruit’s Discord channels and be part of the community!

CircuitPython – The easiest way to program microcontrollers –

Maker Business — “Packaging” chips in the US

Wearables — Enclosures help fight body humidity in costumes

Electronics — Transformers: More than meets the eye!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Silicon Labs introduces CircuitPython support, and more! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Guardian Robot, Weather-wise Umbrella Stand, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — #NewProds 7/19/23 Feat. Adafruit Matrix Portal S3 CircuitPython Powered Internet Display!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !


  1. It’s been out for like a week or two now, but it’s awesome. The tone() and notone() functions are really useful.

  2. dylan, “Whoops, we forgot to post up about this”… 🙂

  3. No problem, you at least took the time to actually post it.

  4. Oh damn i’m stupid.

  5. Yeah, thanks — I hadn’t seen this either.

    Now johngineer can create Arduino-based products with 1/17 more unintentional killing-power.

Sorry, the comment form is closed at this time.