Browse over 10,000 Electronics Projects using the Page Numbering provided at the bottom of each Page.

An isolated analog output for Arduino Uno

An isolated analog output for Arduino Uno

Giovanni Carrera writes:

This project completes the series of my articles about the Arduino analog I/O with the aim to use it as a controller of small automation systems.
In control systems of the industrial plants it is always advisable to isolate both the inputs and the outputs coming from the field. This prevents disturbances caused by power surges, lightning strikes or other EMI sources and also by ground potential differences.
Arduino Uno, or systems based on the ATmega328 chip has no a true analog output, but it may be realized using a PWM output averaged with a low-pass filter.
The use of an averaged PWM signal with 8-bit setting is not comparable with a real DAC, but in the insulation case presents undoubted advantages of simplicity since it is sufficient to use an optocoupler for isolating the PWM digital signal. Recently I designed another circuit to generate a 4-20 mA current with Arduino, that experience gave me the idea for this new project.

More details at ArduPicLab blog.

 

More Articles to Read

Replace a microwave’s beeping with the Windows XP startup sound
Replace a microwave’s beeping with the Windows XP startup sound
A DIY Laser Scanning Microscope
A DIY Laser Scanning Microscope
Teleknitting: TV-based string art
Teleknitting: TV-based string art
Start your day with Nerf target practice!
Start your day with Nerf target practice!
Converting a coffee maker into a 3D printer
Converting a coffee maker into a 3D printer
Sort your M&Ms or Skittles with this ingenious machine
Sort your M&Ms or Skittles with this ingenious machine
The Hunt is both a playful game and tasteful home decor
The Hunt is both a playful game and tasteful home decor
The Rick and Morty Alarm will make sure you’re always on time
The Rick and Morty Alarm will make sure you’re always on time
Build your own MIDI accordion with Arduino
Build your own MIDI accordion with Arduino
A tiny orchestra of Lego Robots driven by Arduino
A tiny orchestra of Lego Robots driven by Arduino
8-bit Frogger game on a digital microfluidics device
8-bit Frogger game on a digital microfluidics device
An experimental game with a conductive rubber band controller
An experimental game with a conductive rubber band controller

Top




Shares