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Sanity check of PCB

August 28, 2017, 11:07 am
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Hey - thanks for the quick reply! That's all very useful, and much appreciated.

I'll see if I can rework the connection points and make them into a standard header. It was partly out of laziness because I was having trouble getting a neat layout, and wanted to avoid using the top layer as much as possible. Also, most of those pads broken out probably won't be needed, but I thought I would break them out in case I did want to use them later on e.g. for extra buttons or sensors. Are there 'standard' drill sizes to go for? I think I left it at the default, but increased the ring diameter to make soldering easier...

I have breadboarded the thing (in real life) and it does work. It got a bit cluttered having everything in the single file so deleted the other components, but would it be better practice to have everything in and just drag non-pcb mounted components off the board in PCB view?

One final question... these were the transistors I'd planned on using: http://www.farnell.com/datasheets/528777.pdf I got a bit confused trying to use the built-in mosfet part with the TO92 package size because it didn't seem to match the datasheet, and this one seemed closer. I think they will physically fit on this board though, and they are logic level as you suggest so am hoping they are suitable...

All the best - and again many thanks for the feedback.

B

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Grove - SPDT Relay(30A)

August 28, 2017, 11:11 am
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I made this mostly using the Adafruit eagle2fritzing converter then had to do some cleanup and make a few components.

Grove - SPDT Relay(30A).fzpz (18.1 KB)

This is my first part I've submitted. Let me know if I need to make some changes or corrections.

I use Fritzing for making diagrams and schematics of my projects to share with others so I only concentrate on the breadboard view and schematic but there is a pcb that eagle2fritzing made but I didn't make any corrections or changes.

Thanks,

Jeffery

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Sanity check of PCB

August 28, 2017, 11:28 am
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I believe it varies by pcb maker, but they will usually have a list of their drill sizes (the less common ones may incur a tooling charge if used). Some like .035, and .038 (IC leads and .1 header pins in Fritzing) are pretty standard, but you really need to check with the fab house either on their website or by asking them.

That's what I'd do, because I find in 6 months I won't remember what I did and why and it is good for the documentation (with the warning that I don't often make boards :slight_smile: I'm usually one of on perfboard)

They look fine (as long as the 100ma drain current is all you need). They are indeed logic level and thus should saturate with 5V drive to the gate. The danger with high threshold gate devices is that they will likely work, but not saturate and thus the device has a high on resistance and replaces some of your series resistor with possibly fatal results (due to over temperature) to the fet. That is one problem with the Fritzing parts (especially transistors) there are so many variations that most are generic and may or may not match your particular pinout. While it is nicer to have a correct schematic representation, creating custom parts can be a pain (although I expect parts editor would let you change pin numbers without a lot of pain) getting a correct pcb footprint with the correct connections is the vital task and you look to have done that.

Peter

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Transfer circuits to protoboard

August 28, 2017, 11:44 am
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Hi, everyone I am trying to transfer the circuit # 1 to a protoboard model. I want to know if I am doing circuit # 2 correctly, please I need your help.

Note: In description I provided the circuit # 2 made in Fritzing

Sin título.png742x908 241 KB

Circuit #2 Protoboard (Reference Fritzing)
Circuito en protoboard.fzz (23.1 KB)

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Sanity check of PCB

August 28, 2017, 12:47 pm
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Hmmm... I think I may have misread the datasheet on that FET. I hadn't spotted the R(ds-on) was so high.

Would something like this be better?

For context, I'm driving an RGB LED with PWM, where each of 3 channels take .33A at ~3.4V. I don't expect to drive them at 100% - probably something like 70% max.

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Transfer circuits to protoboard

August 28, 2017, 12:52 pm
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Before anything else, there is a serious error in both drawings. As shown the switch will short circuit the batteries in one position. With LIPO batteries that is extremely dangerous and could result in an explosion. So do not try and actually implement either circuit as shown. Very likely the switch should not have a connection to ground, only to the positive wire of the battery.

Edit: Other than the battery problem (which wasn't your fault), there are only two other errors. C3 has its polarity reversed and the connection from the corrected battery switch to the top power rail on the breadboard didn't go anywhere (it is now correctly connected). In addition I changed the 7.4 V wires directly from the battery from red to orange to make them different than the 5V lines. The corrected sketch is here:

Circuito en protoboard_fixed.fzz (35.5 KB)
_

Peter

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Sanity check of PCB

August 28, 2017, 1:01 pm
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Yep this would be a better bet (as long as you don't mind the smd case). It is always better to have lots of head room in max rating, and the original fet had a 100ma continuous drain current limitation (I did see the high rds on, but with a 220 ohm resistor in series with it, it wasn't that bad). This one with 1.7A drain current will be loafing at 400 ma which is always a better bet.

Peter

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Transfer circuits to protoboard

August 28, 2017, 3:10 pm
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Many thanks for your time and explanation, I really appreciate this :slight_smile: I'm new to these issues and I experiment a little with everything hahahaha, I will take very into account the circuit you just modified, again thank you very much :slight_smile:

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Grove - SPDT Relay(30A)

August 28, 2017, 4:18 pm
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Looks good in all three views. I assume the connector for the signals is 2mm (as I recall all the Grove parts are 2mm) as it isn't on .1 in BB, but matching real life is good. Don't see any problems.

Peter

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Creating parts with movable schematic elements

August 29, 2017, 4:36 am
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Creating parts with movable schematic elements

August 29, 2017, 4:38 am
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QTR 8 Pololu Line Follower Sensor Part

August 29, 2017, 8:52 am
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Flip a transistor

August 29, 2017, 11:48 am
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I noticed I can't seem to flip a transistor - is there an option to allow me to flip it , so the "rounded" face is facing me?
In breadboard view, it seems to not want to flip.

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Arduino mkrfox1200 bug with fritzing to make pcb

August 29, 2017, 2:20 pm
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Bonsoir, je n'arrive pas à utiliser le fichier de l'arduino mkrfox1200 présent en téléchargement sur le site arduino.cc dans la fiche produits MKR FOX 1200 dans FRITZIG, il y a un message d'erreur à l'ouverture et cela ne s'affiche pas pour créer un PCB. Merci de votre aide.

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QTR 8 Pololu Line Follower Sensor Part

August 29, 2017, 3:25 pm
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Looks like the ones you are seeing died when google code shut down. Luckily it is well documented and thus easy to make a new one for (although this is from the data sheet since I don't have one).

Pololu QTR-8 Reflectabce Sensor array.fzpz (17.4 KB)

Peter

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Flip a transistor

August 29, 2017, 3:27 pm
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You can rotate it by 180 degrees, but I think what you want is to straighten it up, and that (AFAIK) can only be done by making a new part.

Peter

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Arduino mkrfox1200 bug with fritzing to make pcb

August 29, 2017, 3:35 pm
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While there seems to be a Fritzing part somewhere (as there are images of it), I don't find one in a google search. Do you have an fzpz file for the mkrfox1200? If so, and it doesn't work either upload it (seventh icon from the left) here or supply a url and I'll have a look at it.

Peter

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Arduino mkrfox1200 bug with fritzing to make pcb

August 29, 2017, 7:14 pm
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Arduino mkrfox1200 bug with fritzing to make pcb

August 29, 2017, 7:26 pm
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Yep, there isn't a pcb svg, its zero length :slight_smile: I'm just making one.

edit:
Wow is this screwed up! Starts at pin22 in apparantly a close to random order ... 22 is the second pin first pin is 51. I'm considering redoing the whole thing ...

Peter

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Arduino mkrfox1200 bug with fritzing to make pcb

August 29, 2017, 7:46 pm
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That page says it has the source to produce the boards and points to three files. Eagle files, Schematic picture and the fritzing file. Obviously the Fritzing file is not for production and the schematic is more of a block diagram because it is missing all the components on the small carrier board that is the main part of the board.

That main little board may be the reason the pins are out of order because they relate to the pin numbers of that little board not the order of the pins on the breakout.

One last thing is also on that page is a png of the pin layout that may help you.

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