You can control the brightness of these LEDs using variable resistors VR1, VR2 and VR3 respectively. Parts Needed. Arduino UNO board – 1 ; 5mm LEDs Red, Green, Blue – each 1 ; 100K Variable resistor – ...

He ended up using multiple 74138 decoder/multiplexer IC’s to control the LED’s. Since the columns have inverted outputs, he couldn’t just hook them straight up to the LED’s.

Of course, there are cases when tight timing does matter and an Arduino won’t make the cut, but in that case, it’s a job for the embedded engineer. Use the HAL, Luke!

This article describes the construction of a simple Arduino RFID Access control DIY (Do It Yourself) Project using Arduino UNO and a RFID reader module (EM-18) to control an LED and a Relay. Circuit ...

With over 30 million developers worldwide, Arduino’s solutions offer a powerful answer to the talent shortage in engineering and break free from vendor lock-in with a robust line of open-source ...