We all love USB. It is well supported across many platforms, easy to work with, and even able to provide a little power to the peripheral. However, the quirk of USB is that peripheral must share ground line with the host. The host is usually a PC and very often a desktop, which means it’s USB ground is electrically connected to earth ground in the wall outlet. It works fine most of the time, but not always.
Sometimes we prefer our ground separate. It happens when PC/earth ground is too “dirty” and we don’t want our circuit to pick up this dirt. Sometimes our device’s ground is not too good or even dangerous if connected to earth ground. Sometimes we are fighting ground loops. In any of this cases we want our USB isolated from the host.
Isolation improves common-mode voltage, enhances noise rejection, and permits two circuits to operate at different voltage levels. It also saves equipment (sometimes), especially PC-based measurement instruments like USB oscilloscopes, logic analyzers, as well as PC itself. It is also very useful in industrial setting, that probably why industrial USB isolator solutions cost between $200 and $400. While looking for a solution for my lab, I found interesting USB isolator part, recently released by Analog Devices, and decided to give it a try.
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.
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!
Maker Business — To make it through a tough business cycle, layoffs should be a last resort
Wearables — EVA foam is like fondant
Electronics — I touched my circuit, and now it glitches!
Python for Microcontrollers — Python on Microcontrollers Newsletter: 300 CircuitPython Libraries, Python Turns 30! #Python #Adafruit #CircuitPython @micropython @ThePSF
Adafruit IoT Monthly — OpenCV Critter Cam, LoraWAN on Raspberry Pi 2040, and more!
Microsoft MakeCode — MakeCode Arcade Turns One!
EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey
New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 2/24/2021 Feat. TPS62827 3.3V Buck Converter Breakout – 3.3V Output 2 Amp Max!
No comments yet.
Sorry, the comment form is closed at this time.