Complete instructions for this episode of Weekend Projects can be found at http://makeprojects.com/Project/Hot-Cold-LED/2445/1

Combine an Arduino, an ultransonic distance sensor, and some common components to build a classic “hot/cold” project. Once assembled, we’ll walk through the software “sketch” loaded onto our Arduino, and experiment with three variations of the “hot/cold” theme, all the while using the same circuit.

Complete instructions for this episode of Weekend Projects can be found at

http://makeprojects.com/Project/PIR+Sensor+Arduino+Alarm/72/1

This project is great for those beginning to build with Arduino, and requires no soldering. Using very few components, and some jumper wire, we’ll build a simple motion-sensing alarm. This project combines technologies we’ve used in previous Weekend Projects, including a PIR sensor and piezo buzzer. It’s great for practical jokes and doubles as an early warning system for the zombie invasion!

Complete instructions for this episode of Weekend Projects can be found at

http://makeprojects.com/Project/Repeat-After-Me-A-Mintronics-Memory-Game/1933/1

Combine a MintDuino and Mintronics Survival Pack into a fun memory game reminiscent of Simon and Pocket Repeat from years past. This project will have you build an Arduino clone, program it, and hook it up to a 4-switch game to test your mind’s memory and dexterity. Challenge yourself or a friend to see who can Repeat After Me!

Complete instructions for this episode of Weekend Projects can be found at

http://makeprojects.com/Project/Monkey-Couch-Guardian/2232/1

Combine an Arduino with a proximity sensor, and make an obnoxious device to discourage cats and other fur-shedding pets from jumping on beds and couches. This project will also introduce you to the SPDT relay, a fundamental component of hobbyist electronics projects.