Hello awesome community,
I'm wondering if I can use just DC power supply as a input signal to act as a switch
ex: Send a SMS once power is down.
So without having to use a transistor to do the switching work I wonder if I can use just DC power to detect switch status
can I?
It's not absolutely clear what you are asking. But I think the answer is yes. If the DC power supply is 5V, you can connect it directly to an Arduino input pin (assuming a 5V Arduino). I assume the Arduino will be powered by a battery so that it can send this SMS? A common ground will be needed between the battery and the power supply.
If the input will be floating (not connected to a known state) when the DC is not connected, the input will need a pulldown resistor or false readings will be possible.
What is want is to use grid power converted to DC to power the Arduino at the same time use that same power to act as a switch
ex: DC power will be use as an input signal lets say pin No:2 so once grid power is no longer supply to pin 2 Arduino will send a SMS (drawing power from the battery pack)
If I can do that how the input will be?
So far I have use (INPUT, INPUT_PULLUP, PULSEIN) non of that has work
If I can do that how the input will be?
So far I have use (INPUT, INPUT_PULLUP, PULSEIN) non of that has work
Post your schematic. INPUT should work. As @groundFungus says, you will need to attach an external pull-down resistor to the Arduino digital input pin.
Just found out that the board is not function well when I connected to external power. so that's why. Anyway thanks guys.
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