Sunday 14 July 2019

arduino - How to convert a digital signal from 5V to 24V?


I have an industrial application where I have to interface a microcontroller output which gives a digital signal (0V to 5V) on its outputs and I want this signal to control a relay which takes (0V to 24V) on its input.


So I have to convert (0V/5V) digital signal into (0V/24V) to operate the relay. The microcontroller's pin output is 5 V 40mA for that I thinking I will use IC ULN2803 along with PC718 optocoupler to drive this 24 relay. My schematic as per my assumption is.. Schematic


I am new to electronics design. Please check my design and let me know if it is correct or not. If not, then please suggest the best design that is suited to my application.




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