Jane123

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  1. If you have read the previous article – Why switch to ARM ? Introduction to ARM Micro Controllers – you must have had a basic idea on what makes ARM7-009 superior to other more commonly found 8-bit architectures. You must also have noticed the complexity of the ARM architecture. The flexible and modular design makes ARM affordable and fast – but at the same time very complex to understand for beginners. It may take weeks to just get the tool-chain up and running without the right tools to get started. First, we go through some pre-requisite concepts of compiling programs for ARM microcont
  2. A simple sawtooth wave generator circuit for generating a saw tooth wave form using a NE555 IC is given below. The frequency of the wave form can be varied by using a POT. The capacitor C, resistor R and zener diode forms a constant current source for charging of the capacitor. When the voltage across capacitor reaches 2/3 Vcc the internal comparator inside 555 goes on and capacitor discharges. When the voltage across the capacitor goes below 1/3 Vcc the internal comparator goes off and now capacitor starts charging. So what's the result of the capacitor ? What result range will th