Hi All,
I am trying to learn building boards and struggling for a couple of days to get a 74HC574 working.
I want to latch data from D1 to Q1 by changing the clock pin from LOW to HIGH, but just nothing happens. I tried all kinds of things with the clock pin, but nothing happens.
Attached is a screenshot of the board. This is the specs sheet I am using for my component.
I would be really thankful for someone pointing me in the right direction.
Hello chrisblablub
Post your sketch, well formated, with comments and in so called code tags "</>" and a real schematic to see how we can help.
Have a nice day and enjoy coding in C++.
Post an annotated schematic, with your small circuit it should only take a few minutes to draw. Also post a link to the 74hc574 datasheet you are using. Check what it tells you about each pin. The part is very fussy and if not treated properly will not give you what you want. I have used a lot of them without any problem.
Yeah, we can never guess what those were. So you need to make it clear, with code and schematic.
On a side note, you really need those regardless of your post here. It's the way digital electronics is done.
I see you're new here, if perchance you skipped over this important introduction, please have a read now:
https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum/679966
You posted in "Education and Teaching", but you actually have a project question. So you should send a moderator request to move it to a more appropriate sub forum.
I've moved this to general electronics, please follow the advice in the tutorial linked in reply #4 and take care when choosing which section to post in.
In your photo it does not look like the chip is correctly placed on the breadboard. The spacing on breadboard between the 2 sides is 0.3", which is correct for that size chip. It looks like you have the pins on one side in the wrong holes, so they probably do not connect to the breadboard contacts.
You have D1 tied low so if you do succeed in clocking it Q1 will go low, turning the LED off.
I cannot see from the photo whether the LED is connected at all, let alone correctly.
Yes, as noted, the IC pins, 1-10, are splayed like.
And the Data is loaded on the low-to-high transition of "CP". It should normally be low, then pulse high and return low.
Thanks all for your fast feedback, will post a schematic next time. I thought this is such a basic question, someone will probably see what is wrong on a first glance.
Actually, the issue was what @PerryBebbington mentioned - wrongly placed the chip. Super stupid. Except this, there is no secret if you know how the 74HC595 works. Connected the pins as described in the linked specs sheet and changed the clock pin from LOW to HIGH.
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