Dc circuit help

Aaron's picture

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Joined: Jan 19, 2020

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Dc circuit help
January 19, 2020 - 7:04pm

I have a signal output on a sensor that is 5vdc when open  and 0v dc when closed, I need to send a ground signal to my timer board when sensor is closed because the input on my timer board trigger needs to see a ground to be triggered, any help would be great thanks.

Sourav Gupta's picture

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Joined: Feb 12, 2018

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Add a pull down resistor.
January 20, 2020 - 12:44am

Add a pull down resistor. This will notify the timer board that the sensor is closed.

Aaron's picture

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Joined: Jan 19, 2020

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I have an liquid optical
January 20, 2020 - 3:36am

I have an liquid optical sensor that has a 5vdc output when open and a .4v  when closed (LGZD sensor v1.1)
I have a l298n H-drive motor board
And a dw44 ne555 4pin timer
12 volt power supply supply power for l298n board and 5v from the L298 board to supply the optical sensor board and the dw555 board power
The output of the optical board is 5vdc when open and .4v when closed the input on the dw44 needs a ground (not sure if needs a ground but if I ground it it works) signal to start the timer, the output of dw44 is 5vdc goes to in2 of the L298 board to start the motor. And I need the timer to start when optical is closed 

Sourav Gupta's picture

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Joined: Feb 12, 2018

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Connect a 4.7k resistor
January 23, 2020 - 9:46am

Connect a 4.7k resistor from the optical board output to the optical board ground.

Then connect the optical board ground to the main circuit ground and power up the optical board. Check whether the output is getting 5V and 0 now.