Prevent microcontroller latch ups and hang ups with this circuit re-setter.
We discussed the breadboard circuit in video #190 (https://youtu.be/wcRuVxXlEKw), but here we have the finished product, including the panelised PCB from JLCPCB together with some testing using a signal generator and an oscilloscope.
The 555 is the most popular integrated circuit ever manufactured. As of 2003, it was estimated that 1 billion units were manufactured every year. And we are using it this week in this timer watchdog that power recycles your Arduino (or other µController of choice) if it hangs up.
Special offer for SMT assembly.
(Special thanks to Michael Kurt Vogel for compiling this)
http://bit.ly/YouTubeVideoList-RalphBacon
Elektor Magazine Article (Wolfgang Borst)
UK: https://www.electronics-lab.com/free-elektor-circuit-ne555-watchdog-timer/
DE: https://www.elektormagazine.de/news/kleine-schaltungen-neu-aufgelegt-watchdog-mit-555-folge-6
https://www.elektormagazine.com/news/small-circuits-can-do-the-job-an-ne555-watchdog-timer-part-6
555 timer IC
https://en.wikipedia.org/wiki/555_timer_IC
Surface Mount 555 chips, less than $1 for 10 pieces (plus shipping)
https://s.click.aliexpress.com/e/_Bfjexh5a
10pcs NE555 NE555P NE555N 555 Timers DIP-8
https://www.banggood.com/10pcs-NE555-NE555P-NE555N-555-Timers-DIP-8-TEXAS-p-1069802.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
CJMCU-4599 Si4599 N and P Channel 40V (D -S) MOSFET
banggood.com/CJMCU-4599-Si4599-N-and-P-Channel-40V-D-S-MOSFET-Expansion-Board-Module-p-1350610.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
10pcs 2N7000 N-Channel Transistor Fast Switch MOSFET TO-92
https://www.banggood.com/10pcs-2N7000-NChannel-Transistor-Fast-Switch-MOSFET-TO92-p-924050.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
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