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Monthly Archive for: ‘September, 2013’

74HC595 Shift Register Tutorial

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Shift register is a sequential logic circuit consisting of flip-flops. They are created mainly to store digital data in the form of bits. The basic working principle of a shift register is the user would enter data into it sequentially and the data will move from the beginning till the end of the shift register. Any bits that ‘flow’ out …

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Salvaging Valuable SMD IC

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I’ve got a non-working Pickit 2 clone lying around. It uses the popular PIC18F2550 because it has USB capabilities. A quick check on Element 14 says that this MCU costs RM 19. That is an expensive microcontroller. Normally a heat gun is required to remove SMD components but I couldn’t be bothered to buy one just to remove a few …

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L298N Dual-Channel 2A Motor Driver

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I’m working on a new project which has two 12V DC Geared motors. Below are their specifications. Its’ rated current is 410mA but if it is stalled, it requires a whopping 1.8A. Stall current is the highest current that the motor will consume when the load is too much (causing the motor shaft to stop turning). When choosing a suitable …

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Microchip PIC16 / PIC18 PWM Mode

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This article explains how to set up and use the PWM module on almost all PIC 16 and PIC 18 devices. Depending on the specifications, some PICs may not even have a PWM module at all and some may have 1 or 2 pins that are PWM capable. For this example, I’m using a PIC16F876A which has two PWM modules …

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