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Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 10:45 am
by NormanDunbar
AforAlex wrote:The SMD's all look the same, or very similar, and I can't see which ones go where. I've got 4 bags i'm trying to work out, they are 1833825, 117=9460, 1759252 and 175-9265. Is there a key somewhere I am missing ... What am I missing?
If you want one, I've created a parts list, cross referecned to the assembly manual pages where they are fitted. Might help?

http://qdosmsq.dunbar-it.co.uk/blog/201 ... arts-list/

Cheers,
Norm.

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 11:08 am
by add1ct3dd
Built mine up yesterday, finally got it from Farnell :)

I was testing the buttons yesterday using the guide from the User Manual, LEDS 1 & 2 worked fine, click the button and the LED goes off. But LED 3 never lit up at all?

I've played around with the LED tests and the 3rd LED works fine, so I'm thinking I have a bad solder join somewhere? What do you guys think? If so where do you think it would be? It looks to be ok on the LED, so I'm guessing the controller or capacitor?

Thanks

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 11:12 am
by alexeames
Replying to Norman's parts list (excellent idea).

This is where the Tandy packaging system really comes into its own. No little bags. It's all heat-sealed into a sleeve in the right order for assembly. Obviously there's labour involved in that, but it was much appreciated. Just snip off the next section each time you complete a stage. Brilliant idea. :D

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 11:13 am
by texy
...or switch 3 perhaps? If you have a meter, you could check the voltage at the switch when pressed and compare it to one of the working switches (when pressed).

Texy

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 12:13 pm
by MikePW
Thanks guys. The 25W it will be. I had a feeling my old 15W would have been too weedy. Mind you I bet I find it again soon after I get the new one :lol:
I've cleared out the little bedroom now and it is going to be my new computing/electronic lab. Thats if I can stop the wife treating it as a walk in wardrobe.

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 12:27 pm
by add1ct3dd
texy wrote:...or switch 3 perhaps? If you have a meter, you could check the voltage at the switch when pressed and compare it to one of the working switches (when pressed).

Texy
I'll give it a go cheers.

Just tested it again and it seemed to be fine!

Could it be an issue with static or something?

Hoping to perform some more tests tonight!

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 4:40 pm
by pmj1979
I have just started soldering the first components to the Gertboard and got as far as C17 before one of the silver "pads" on the board itself peeled back. It was stuck to one end of the capacitors and when the other end was soldered down it see saw'd off the base. :shock: It didnt come right off, it was still hinged somewhere but I dont know how its all connected, whether its all still where it should be and simply loose now.

How can I check before going any further that I haven't just ruined the board?

I removed the cap as best I could and the image in the link (64K max attachment size!?) is the best I could get with an iPhone aimed through a magnifying glass.

I cant make out how the components next to it connect or whether its possible, although far from ideal, to bodge past this pad if I connect the capacitor to its next hop on the board?

http://i30.servimg.com/u/f30/15/60/08/03/c1710.jpg
Image

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 5:01 pm
by domesday
You are not the only one to damage the pad for C17 see this thread http://www.raspberrypi.org/phpBB3/viewt ... 42&t=19128

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 5:38 pm
by pmj1979
Thanks! Ive asked in there too.

...looks like I can just jump top C17 to top R24 though?

http://raspi.tv/wp-content/uploads/2012 ... tBoard.jpg

http://img716.imageshack.us/img716/483/pcbavrpict.gif

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 6:01 pm
by TykeTinkerer
A big thank you to you Gert. Finished assembling my board a couple of days ago and have run the buttons, leds and butled test programs. Will be trying to run the other test programs this weekend. The soldering certainly isn't pretty but it's my first real soldering project so I'm really pleased it seems to be working.
For anybody who hasn't started yet, perhaps this might be useful. Bought one today from Lidl but wish I had had it a couple of days ago -

http://www.lidl.co.uk/cps/rde/xchg/lidl ... _35462.htm

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 8:45 pm
by zenbike
So, I'm also soldering up my Gertboard. Managed to place one of the IC sockets backwards.

Suggestions for removal without damage?

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 9:56 pm
by SN
alexeames wrote:Replying to Norman's parts list (excellent idea).

This is where the Tandy packaging system really comes into its own. No little bags. It's all heat-sealed into a sleeve in the right order for assembly. Obviously there's labour involved in that, but it was much appreciated. Just snip off the next section each time you complete a stage. Brilliant idea. :D
I agree - the Tandy strip bag sleeve made it a doddle

My recommendation (which no one else has mentioned yet) for construction:-

Build the thing in/on a white tea tray - no chance of tiny components getting lost or falling off the table - in fact I was deliberately pouring a few at a time on to the tray and examining them under my magnifying glass
Something like this
Image

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 10:15 pm
by add1ct3dd
SN wrote:
alexeames wrote:Replying to Norman's parts list (excellent idea).

This is where the Tandy packaging system really comes into its own. No little bags. It's all heat-sealed into a sleeve in the right order for assembly. Obviously there's labour involved in that, but it was much appreciated. Just snip off the next section each time you complete a stage. Brilliant idea. :D
I agree - the Tandy strip bag sleeve made it a doddle

My recommendation (which no one else has mentioned yet) for construction:-

Build the thing in/on a white tea tray - no chance of tiny components getting lost or falling off the table - in fact I was deliberately pouring a few at a time on to the tray and examining them under my magnifying glass
Something like this
Image
To be honest I had no issue with losing components, only open the bags/take them out exactly when you need them and be careful!

I built all of my board on a sponge and didn't lose anything once :D

Re: Gertboard Assembly Thread

Posted: Thu Oct 18, 2012 11:03 pm
by rurwin
zenbike wrote:So, I'm also soldering up my Gertboard. Managed to place one of the IC sockets backwards.

Suggestions for removal without damage?
It's very difficult to remove an IC socket. Leave it as it is and mark the new top end with a dab of Tipex so you don't forget.

Re: Gertboard Assembly Thread

Posted: Fri Oct 19, 2012 6:28 am
by alexeames
rurwin wrote:
zenbike wrote:So, I'm also soldering up my Gertboard. Managed to place one of the IC sockets backwards.

Suggestions for removal without damage?
It's very difficult to remove an IC socket. Leave it as it is and mark the new top end with a dab of Tipex so you don't forget.
That's a good tip - if you'll pardon the pun! Which socket was it zenbike?

Re: Gertboard Assembly Thread

Posted: Fri Oct 19, 2012 8:27 am
by zenbike
alexeames wrote:
rurwin wrote:
zenbike wrote:So, I'm also soldering up my Gertboard. Managed to place one of the IC sockets backwards.

Suggestions for removal without damage?
It's very difficult to remove an IC socket. Leave it as it is and mark the new top end with a dab of Tipex so you don't forget.
That's a good tip - if you'll pardon the pun! Which socket was it zenbike?
The IC Socket for MC74HC244AN at location U4, just to the right the 3 push buttons, assuming you follow Gert's board orientation from the assembly manual.

Gert also said that all the IC Sockets are directional, but only so that the Pin 1 indicator is in the right place. They are symmetrical in operation, so if you place the chip in the correct orientation, as if the socket was correctly placed, it will still work.

Re: Gertboard Assembly Thread

Posted: Fri Oct 19, 2012 8:51 am
by alexeames
zenbike wrote:The IC Socket for MC74HC244AN at location U4, just to the right the 3 push buttons, assuming you follow Gert's board orientation from the assembly manual.
You'll never need to remove that chip unless you blow it up. It's one of the buffers. Just make sure it's facing the same way as the other two identical chips :)
zenbike wrote:Gert also said that all the IC Sockets are directional, but only so that the Pin 1 indicator is in the right place. They are symmetrical in operation, so if you place the chip in the correct orientation, as if the socket was correctly placed, it will still work.
Yes. The sockets prevent us from destroying the chips when we're soldering. They don't bring much else to the party. :D

Re: Gertboard Assembly Thread

Posted: Fri Oct 19, 2012 7:48 pm
by SN
add1ct3dd wrote: To be honest I had no issue with losing components, only open the bags/take them out exactly when you need them and be careful!

I built all of my board on a sponge and didn't lose anything once :D
I used small strips of masking tape to hold the bits in place whilst the board was upside down for soldering rather than Gert's suggested sponge

Oh and I also got an IC holder the wrong way round :oops: I used a CD marker pen at the top end of the holder to redraw the little half moon shape on the board to remind me to put the chip in the right way round

Re: Gertboard Assembly Thread

Posted: Fri Oct 19, 2012 7:53 pm
by alexeames
SN wrote:
add1ct3dd wrote: Oh and I also got an IC holder the wrong way round :oops: I used a CD marker pen at the top end of the holder to redraw the little half moon shape on the board to remind me to put the chip in the right way round
Should have burnt it in with a soldering iron. :lol:

Re: Gertboard Assembly Thread

Posted: Fri Oct 19, 2012 8:24 pm
by Gert van Loo
Yes. The sockets prevent us from destroying the chips when we're soldering. They don't bring much else to the party.
Exactly. One of the things that makes the board more expensive then if it was sold ready-made.
It is all a trade-off.

Re: Gertboard Assembly Thread

Posted: Sat Oct 20, 2012 12:53 pm
by Michael_O
Thanks to everybody for all the good advice in this thread. I built my board in about three hours yesterday afternoon (happened to be off work for the day and had the kitchen table to myself!).
While I have been interested in electronic projects for many years, it is probably thirty years since I built anything this big. I was a little daunted at first by the number of solder joints to be made but now that it's finished I am delighted that I'm still able for it. I think I would definitely recommend trying to do it all at once to make full use of the initial enthusiasm.

Some comments:
I would not have had the foggiest idea what to do with the SMDs if I hadn't watched Gert's video on how to solder them on the Element 14 site but until the kit is delivered you still have no idea of how small they are. I nearly lost one opening the first set.

When I saw the SMDs I called into my local Maplin and bought a pointed tip for my trusty old 15W Antex. I also picked up a "Helping Hands" magnifier but found that a good desklight and a strong pair of reading glasses were more useful.

I too got the Tandy kit and found their packing invaluable. I followed their packing order in assembly but had Gert's brilliantly detailed instructions to hand at the same time.

The white tea tray is a great idea but I don't have one so I was working on a white sheet of paper on the same principle - I would never have found the missing SMD cap on a sheet of newspaper!
I inspected the solder on the bottom of the board with a magnifying glass later - when my eyes had recovered - and found just one pin I had missed on a resistor array.

I haven't had time to test my work yet so fingers crossed until I do.

Thanks again to everyone and particularly of course to Gert for his design in the first place as well as his continuing contributions to this thread.

Re: Gertboard Assembly Thread

Posted: Sat Oct 20, 2012 1:44 pm
by zenbikr
Is it normal for the procedure for testing the 3.3v power on J7 to reboot the Pi? It's very consistently causing it to power cycle or at least to reboot from the color test screen, as if just powered on, when I touch the J7 pin and a ground, or when I place the jumper on J7 to power the board.

I do get 3.31v power on the multimeter.

Re: Gertboard Assembly Thread

Posted: Sat Oct 20, 2012 3:22 pm
by mister_wavey
no, not normal.

Re: Gertboard Assembly Thread

Posted: Sat Oct 20, 2012 5:59 pm
by ChrisMc
I managed to take the end off the 100uF capacitors when I was trying to tidy up the solder job :(

Min order on farnell is 100 :shock:

I'm pretty sure if someone started a kit, with two spare of all the surface mounted stuff on ebay, they might be popular.

Re: Gertboard Assembly Thread

Posted: Sat Oct 20, 2012 6:07 pm
by alexeames
ChrisMc wrote:I managed to take the end off the 100uF capacitors when I was trying to tidy up the solder job :(

Min order on farnell is 100 :shock:

I'm pretty sure if someone started a kit, with two spare of all the surface mounted stuff on ebay, they might be popular.
This (very good) suggestion has been made. I thought the Farnell kits did this as standard?