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Current LED Bar Graph design for Arduino UNO platform uses 16 independently controlled RGB LED’s with integrated WS2812 chip. Similar project is available at this link. In general the voltage is divided into equal intervals equal to the number of LED’s being used . As the input voltage rises the color and the number of … Read more
LED Battery Level Indicator can be built using Arduino UNO board and 10 LEDs. Similar design that uses 2×16 LCD display can be found at this link. RGB LED variant is here. For Raspberry Pi version click here. I/O lines are directly driving 10 colored LEDs (4 – Green, 2 – Yellow, 2 – Orange … Read more
Multiplexing 7-Segment display scheme with Raspberry Pi as described here can be used as a basis for more complex projects. By adding 4×4 keypad matrix and replacing individual 7-Segment displays with a common anode 4 digit 7-Segments module a simple countdown counter can be built. Similar design based on Arduino platform is available at this … Read more
This article shows a basic interface between PIC16F microcontroller and a unipolar stepping motor using an assembly code. For programming the MCU you’ll need PICKIT2 or PICKIT3 device. Similar design for Arduino platform can be found at this link. Instead of using a dedicated motor driver IC like a very popular L293D ULN2003A was used. … Read more
A simple light sensor can be built using a photoresistor and Arduino UNO board. Similar design is available here. This design requires only a few additional components like 10k resistor and a 10k potentiometer to adjust the light intensity level to trigger the circuit. Photo resistor in series with 10k creates a simple voltage divider … Read more