Parsing various resistor band colors is fairly simple once you know what each color means. Orient the resistor with the gold or silver band on the far right. Note the color on the far left ...

Yes, in less than 1/4 of one second an Arduino can open any of the millions of these locks in service. The exploit in Onity programmable keycard locks was revealed by [Cody Brocious] at the ...

How the resistor color-code bands work At the heart of the project is an Arduino Nano clone and a potential divider that measures the resistance of the test resistor against a known fixed value.