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microcontroller – 74HC vs – Electrical Engineering Stack Exchange
Do they matter for your purpose? 74nc540 see that I can control a relay from an Arduino. I am using a set of 8 relays. Iam relatively new to electronics, and I am building a prototype from an Arduino board. Means to actively drive the pin for the inactive state 47hc540 of using a separate inverter? But in this question they are suggesting to use a 74HC Then you need a ULN 8 Darlington relay driver.
It is like the circuit I drew up but has 8 of them in one package. Home Questions Tags Users Unanswered. Post as a guest Name. No need to install a bulky IC. Wouldn’t it be an option 774hc540 invert the signal already in your software?
This diagram should solve the problem. Sign up using Facebook. The relay can be from 3. A link to the ULN The LED consumes little current so is not an 74uc540. I am using a led to show the status of the pin.
But the relay is off. Can i use a instead of 74HC? I will check it for sure. As Humpawumpa says, invert the logic in your code. However the problem is – the relay I am using is active low.
Thanks for the answer. I dont understand what this means. This solution works when there is a single relay.