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Thanks a lot for your help! It is like the circuit I drew up but has 8 of them in one package.
Then you need a ULN 8 Darlington relay driver. But in this question they are suggesting to use a 74HC Home Questions Tags Users Unanswered.
No need to install a bulky IC. I see that I can control a relay from an Arduino. Iam relatively new to electronics, 74hd540 I am building a prototype from an Arduino board.
I am using a led 74hcc540 show the status of the pin. So isnt considering an IC the best solution. This diagram should solve the problem. Do they matter for your purpose? A link to the ULN I will check it for sure. Thanks for the answer. Means to actively drive the pin for the inactive state instead of using a separate inverter? Sign up using Facebook. I left you a present.
Can i use a instead of 74HC? The LED consumes little current so is not an issue. But 74h5c40 relay is off. Sign up or log in Sign up using Google. Wouldn’t it be an option to invert the signal already in your software?
It should work fine.
microcontroller – 74HC vs – Electrical Engineering Stack Exchange
As Humpawumpa says, invert the logic in your code. 74hc40 when I am active high, the led turns on. However a relay usually consumes more current and has a back-emf pulse when it is switched OFF.
So i was thinking of using an inverter. I dont understand what this means.