Resistor color code and multimeter info. Saving for reference
BASIC CIRCUITRY of Metal Detection
PIR Motion Sensor Switch (Arduino)_Elec-Cafe
Battery Desulfator Circuit
12V Lead Acid Battery Desulphator Circuit
The Complete Setup
The iBoardbot is an internet controlled robot capable of writing+drawing (and wiping!) on a glass surface.
Your imagination is the limit. This tire turned into planter is the perfect example. http://theownerbuildernetwork.co/8zis: