A Brief History of Traffic Lights

On this day in 1914, the world’s first traffic signal was installed in Cleveland Ohio. This neat article from Artsy takes a look into the history of traffic lights.

It was thanks to a generous gift from millionaire physician and New York commissioner of traffic, Dr. John A. Harriss, that the city’s traffic problem finally got a reprieve. His 1920 design for a simple, two-light signal, which consisted of a wooden shed housing light bulbs and supported by a steel base frame, was nothing to look at, but it quickly helped to solve the problem of endless gridlock. By 1922, an elegant neoclassical bronze tower design by Joseph H. Freedlander was unveiled, further cementing the importance of signaling systems in the life of the thriving metropolis. Notably, both of these early systems used green for “Stop” and white or clear for “Go.”

Read more.


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 code.org, 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.

Join 35,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

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!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — How (some) chips get made

Wearables — Sample code is your new best friend

Electronics — Solder braid quick fix

Python for Microcontrollers — Python on Microcontrollers Newsletter: 10K Subscribers, Picos Made in Africa and more!! #CircuitPython @micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Jellyfish Lanterns, Matter 1.0, 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! — JP’s Product Pick of the Week — 4pm Eastern TODAY! 11/29/22 @adafruit @johnedgarpark #adafruit #newproductpick

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



No Comments

No comments yet.

Sorry, the comment form is closed at this time.