ant_thomas
Posts: 115
Joined: Fri May 04, 2012 4:33 pm

Stacking headers

Wed Feb 03, 2016 4:54 pm

I'm looking to buy an I2S DAC that fits directly to the RPi 2x20 GPIO header.

I want to use other GPIO pins but the DAC in question doesn't have any sort of breakout for the unused pins.

Does a breakout board exist that could be placed between the RPi and the DAC?

Other option is the remove the header on the DAC and solder in a new stacking header like this, but I fear I would ruin the DAC board

Image

gordon77
Posts: 5036
Joined: Sun Aug 05, 2012 3:12 pm

Re: Stacking headers

Wed Feb 03, 2016 5:02 pm

Have you got a link to the one you are buying ? It would be good to see it to consider options

User avatar
mikronauts
Posts: 2783
Joined: Sat Jan 05, 2013 7:28 pm
Contact: Website

Re: Stacking headers

Wed Feb 03, 2016 6:19 pm

Funny you should ask...

I will be announcing such a prototyping board in a few days, including 40 pin stacking header :)

Basically a 40 pin version of http://www.mikronauts.com/raspberry-pi/ezaspi/
ant_thomas wrote:I'm looking to buy an I2S DAC that fits directly to the RPi 2x20 GPIO header.

I want to use other GPIO pins but the DAC in question doesn't have any sort of breakout for the unused pins.

Does a breakout board exist that could be placed between the RPi and the DAC?

Other option is the remove the header on the DAC and solder in a new stacking header like this, but I fear I would ruin the DAC board

Image
http://Mikronauts.com - home of EZasPi, RoboPi, Pi Rtc Dio and Pi Jumper @Mikronauts on Twitter
Advanced Robotics, I/O expansion and prototyping boards for the Raspberry Pi

User avatar
karrika
Posts: 1124
Joined: Mon Oct 19, 2015 6:21 am
Location: Finland

Re: Stacking headers

Thu Feb 04, 2016 3:35 am

You could also ask the manufacturer of the DAC card to ship it without the 40-pin header. Then you can solder in your extended pin header.

But be aware that the Adafruit long-pin header has too narrow pins for this. You need to buy from Toby in the UK. They have a decently priced 40-pin header with long pins. I am using them on Miscap and DiscoHAT/DiscoCap designs.

alphanumeric
Posts: 2553
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Stacking headers

Thu Feb 04, 2016 12:57 pm

I used one of these, https://www.adafruit.com/products/2310 soldered to one of these, https://www.adafruit.com/products/1979 It's plugged into my A+ with a sense hat plugged on top of it. I used it to get some separation between my Pi and sense hat. I was having a heat transfer issue. I am going to be adding a RTC to the proto hat. The GPIO pins are all brought out and labeled for you. Just make sure you get the one "without" the eprom on it. Otherwise you won't be able to stack another hat on top of it.

ant_thomas
Posts: 115
Joined: Fri May 04, 2012 4:33 pm

Re: Stacking headers

Thu Feb 04, 2016 10:55 pm

Thanks for the replies.

This is the one I'm looking at - http://www.ebay.co.uk/itm/121853340297

Image

I would much prefer to stack on top of that (meaning desoldering the current connector) rather than below due to it being easier to access from above, but if below is the easier option I'd be fine with that.

Time to buy some desolder wick?

ant_thomas
Posts: 115
Joined: Fri May 04, 2012 4:33 pm

Re: Stacking headers

Thu Feb 04, 2016 10:58 pm

alphanumeric wrote:I used one of these, https://www.adafruit.com/products/2310 soldered to one of these, https://www.adafruit.com/products/1979 It's plugged into my A+ with a sense hat plugged on top of it. I used it to get some separation between my Pi and sense hat. I was having a heat transfer issue. I am going to be adding a RTC to the proto hat. The GPIO pins are all brought out and labeled for you. Just make sure you get the one "without" the eprom on it. Otherwise you won't be able to stack another hat on top of it.
Thanks, that looks like it might be the best solution to stack under the DAC. A few right angled headers could be ideal for easy access.

alphanumeric
Posts: 2553
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Stacking headers

Thu Feb 04, 2016 11:05 pm

For me, under was better. I'm using the LED matrix on my sense hat to display a scrolling message with date, time, temp, etc info. I need it clearly visible. Plus, unsoldering the current header on the sense hat would have been a real pain. It's a two piece header that's soldered to both sides of the circuit board. I didn't have to unsolder anything, and only had to solder on the one stacking header. It was a plus, plus for me.

ant_thomas
Posts: 115
Joined: Fri May 04, 2012 4:33 pm

Re: Stacking headers

Thu Feb 04, 2016 11:17 pm

alphanumeric wrote:For me, under was better. I'm using the LED matrix on my sense hat to display a scrolling message with date, time, temp, etc info. I need it clearly visible. Plus, unsoldering the current header on the sense hat would have been a real pain. It's a two piece header that's soldered to both sides of the circuit board. I didn't have to unsolder anything, and only had to solder on the one stacking header. It was a plus, plus for me.
I think that's route I'll go for. Even better that the Adafruit protoboard is available in the UK for less than a generic version on ebay.

alphanumeric
Posts: 2553
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Stacking headers

Fri Feb 05, 2016 11:08 am

Just make sure you get the one "without" an eprom. The one with the eprom on it isn't stackable with other hats. That's what it says anyway. There are two version, one with an eprom and one without.

RichardatWillow
Posts: 25
Joined: Fri Jan 08, 2016 8:33 am

Re: Stacking headers

Mon Feb 08, 2016 1:59 pm

Hi

We offer our FLAT Pi. This has the boards laid out flat. One Raspberry Pi and up to three other boards as well as prototyping areas. So you can plug in a DAC on one set of pins and still plug in other boards even if they don't have stacking headers.
Image
For more information, visit us on http://www.willowcomponents.co.uk

Good luck
Richard
Willow Components

User avatar
liudr
Posts: 687
Joined: Sat Jun 01, 2013 12:11 am
Location: Central MN, USA
Contact: Website

Re: Stacking headers

Mon Feb 08, 2016 9:32 pm

Desoldering that many pins is going to be a nightmare. Solder wick can remove some solder but it's hard to remove all solder from every single pin. If you want to try, maybe get a header, solder it to a scrap board and try your best to remove it.
Arduino data loggers, user interface, printed circuit board designer since 2009, RPI 3B 2B 2B Zero Jessie, assembly/C/C++/java/python programmer since the 80's

Return to “HATs and other add-ons”