Dr. TõnisNov 10, 20191 min readUSB charger with a timerIt is a USB charger that turn complacently off after 3.5 hours. After one presses the power button (the red one) a relay is turned ON and it stays ON approximately 3.5 hours. If the user presses the other button (the gray one) the timer is reset.The timer circuit
It is a USB charger that turn complacently off after 3.5 hours. After one presses the power button (the red one) a relay is turned ON and it stays ON approximately 3.5 hours. If the user presses the other button (the gray one) the timer is reset.The timer circuit
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