Delayed power cycle

Discussion in 'General Electronics Chat' started by tnuz, Nov 12, 2013.

  1. tnuz

    Thread Starter New Member

    Nov 12, 2013
    1
    0
    Hi,

    I've got an Arduino project in which I need t reset a sensor at times. The most reliable 'reset' is a power cycle, but I don't want to do that manually. My thought is to have the Arduino power cycle itself. For example, when I set output 7 high (3.3v), the power circuit will stop supplying power to the Arduino for 1 second.

    My question: is this possible? And if so, how.
    Your help is much appreciated.

    Martyn
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,157
    3,064
    You could use a low-going pulse on a 555 monostable to initiate a 1 sec power down. Use the timer's output to control a MOSFET that switches the power to the Arduino.
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,395
    1,607
    Is it your just sensor or the controller too that needs the thunkin?

    If it's also your controller... you have problems to find & fix instead of using a band aid.

    If just your sensor then use that controller pin to switch the sensor's power. A MOSFET or transistor would do, but with semiconductor pricing being as it is today you can buy a low dropout regulator (LDO) for the same price as a transistor. And lots of LDO's have an enable input that your controller can control.
     
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