4 BUILDING WATCHDOG TIMERS
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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