Measures the ambient temperature and displays both the Fahrenheit and Celsius on the LCD.
Project showcase by Michael Guerero
Moves chess pieces around the board invisibly and seemingly magically.
A small-scale HVAC system utilizing a closed-loop feedback PID controller that can maintain a set-point temperature within the box.
A laser-cut robot kitten that runs and learns from you.
Project showcase by Rongzhong Li (李荣仲)
If you're referring to the schematic, those two 3-leg components are the limit switches. They let the stepper motor know when it reached its home position. :)
I can't think of what the exact pin connections were for the stepper drivers and I disassembled it a long time ago. There are dozens of good tutorials out there for the A4988 drivers that I followed that explain everything way better than I ever could so go check some of those out.
I made this project with almost no background in electronics and using online forums and video tutorials for almost every component and the code. Learning by doing (and failing) is most of the fun for things like this. Good Luck : )
The electromagnet worked for me because I was powering it with 9 Volts instead of 5. Also, the most important thing is to make the distance between the magnet and metal ball as small as possible. I used an acrylic sheet that was less than 2 mm thick and had the magnet almost touching the bottom side of it.
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