LPC17 and DOUT

[fourfour]

Hey guys.

 

I feel super stupid atm. I can't get anything to work as expected. I need to get back the basics here.

 

I am have the LPC17 and a DOUT connected via J8. I hooked up an LED to Vs and D7 and entered 'set dout all 0'. I am still getting 5v at D7 all the time.

 

Nothing else is connected.

 

What am I doing wrong? Board specs attached.

 

Thanks!!

-eric

[kpete]

Why don't you try setting all the Dout's to 1 with the command "set dout all 1" and see if it changes things.  The outputs might be inverted in your configuration.

 

Pete

[fourfour]

Hey Pete.

Ya, I tried that already. I also tried setting individual pins to 0|1 and nothing happens.

[Duggle]

Have you eliminated basic wiring error? (I suppose the cable could be in backwards...) 

Can you post a picture?

[fourfour]

Hey Duggle.

I am getting voltage to the DOUT board, tried using J8 and J9. Here are some pics, thanks for your help!!

 

https://s3.amazonaws.com/uploads.hipchat.com/14874/54948/jijmbr9a06d226i/IMG_9264.jpg

https://s3.amazonaws.com/uploads.hipchat.com/14874/54948/szsbs0p7lz9nyxs/IMG_1599.JPG

[Spirit]

hi as i see on you pic it seems the 74HCT541 seems to we wrong connected...

 

/spirit

[TK.]

Correct!

 

@fourfour: don't forget to spend spirit a beer for his careful observation! :)

 

Best Regards, Thorsten.

[fourfour]

@spirit: oh my, thanks for catching that.

 

Unfortunately, that didn't solve the issue. LED still on all the time. I checked my wiring again over the whole board.

 

(how do you send a beer?)

[Duggle]

It's not clear from the photos the connections from core to dout (all wires are white).

Why not IDC/ribbons? They can be sourced cheaply (from the right places) they are very quick, neat, extremely reliable, and hard to get wrong connections.

[fourfour]

@duggle: I assumed they just mirrored J8

e.g

Vs

Vd

Si

Sc

Rc

 

I have some ribbons on order. The site didn't state that I needed to order them separately.

 

Thanks for your help.

[Spirit]

ahh yes you also see that on the pic but you use the wrong Row pins...

you need to use

 

J9:

 

VS

VD

SO <----!!!!

SC

RC1

 

 

SI = for DIN (Buttons/Encoders)

SO= DOUT (LED)

 

/Spirit

Edited May 19, 2013 by Spirit

[fourfour]

Ok! We have liftoff!

 

Thanks so much everyone.