Projects that sit unattended for some time may lock up or stop working because of accidents, suboptimal design, or power issues. To solve these problems, you can use a watchdog timer, a small circuit that sits dormant while the project is operating normally but hard resets the microcontroller to a restart operation if it doesn’t receive a normal signal. These timers can help you build more advanced, professional, and reliable projects.
In this chapter, you’ll learn to:
Configure the 555 timer IC as an astable timer
Use the formulas to calculate 555 timer IC delay periods
Build your own watchdog timer using a PCB ...
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