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So when I am active 74hcc540, the led turns on. Sign up using Email and Password. Home Questions Tags Users Unanswered. A link to the ULN Means to actively drive the pin for the inactive state instead of using a separate inverter? Thanks for the answer.
I am using a led to show the status of the pin. This diagram should solve the problem. It should work fine.
Post as a guest Name. Sign up or log in Sign up using Google. But the relay is off.
As Humpawumpa says, invert the logic in your code. Do they matter for your purpose? I left you a present. I see that I can control a relay 7h4c540 an Arduino. Thanks a lot for your help!
This solution works when there is a single relay. Does it make any difference? So i was thinking of using an inverter. The relay can be from 3. Wouldn’t it be an option to invert the signal already in your software?
However a relay usually consumes more current and has a back-emf pulse when it 74hc50 switched OFF. I dont understand what this means. But in this question they are suggesting to use a 74HC The LED consumes little current so is not an issue.
microcontroller – 74HC vs – Electrical Engineering Stack Exchange
It is like the circuit I drew up but has 8 of them in one package. No need to install a bulky IC.
However the problem is – the relay I am using is active low. Iam relatively new to electronics, and I am building a prototype from an Arduino board. What are the differences between and 74HC that you can read out of the datasheet?