ATmega328-Based Wall Outlet Offers Soft Start and Output Options




Electronic technician Yannick Turcotte has designed a wall outlet that offers a soft starter for table saws, as well as a second outlet that can engage with the first, or be used as a delay, shutting off the power after a specific time limit. Soft starters are great devices that temporarily reduce load and torque in the power train of electrical motors, thus reducing current surge during start-ups. These units are perfect for use with power tools and are great at lowering mechanical stress inflicted on their motors, which will extend their lifespan.

The outlet features a soft/hard output socket and a second socket that can engage whatever is plugged into it with the first, or delay shutoff after power has been shut down. (📷: Yannick Turcotte)

Turcotte designed his Table Saw Soft Starter around an ATmega328 microcontroller, a linear power supply with bridge regulator, an H11AA1 optocoupler, and a CSE187L current-sensing module. The electronics were soldered to a homebrew 1-layer PCB outfitted with transformers, and a pair of LEDs, all packed into a pair of electrical boxes coupled together.

Yannick designed his compact PCB and soldered the electronics neatly to the board, which fits snuggly into a pair of electrical boxes combined together. (📷: Yannick Turcotte)

Rounding out Turcotte’s build is a pair of outlets wired together, with one for a soft/hard start, and the other for engaging a delayed shutdown, with both connected to the board and controlled by the ATmega328. Turcotte coded his Table Saw Soft Starter with Atmel Studio and used Zadig to upload the code via USBasp or USBtiny. His project is an excellent build that won’t break the bank, and could save a few fingers down the road.


ATmega328-Based Wall Outlet Offers Soft Start and Output Options was originally published in Hackster Blog on Medium, where people are continuing the conversation by highlighting and responding to this story.





Original article: ATmega328-Based Wall Outlet Offers Soft Start and Output Options
Author: Cabe Atwell