How can I work out what size the fritzing fab has? All they say is "minimum 7 mil structures, 0.4mm drills and vias"
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Minature Thermocouple to PCB connector. How Do I Make It?
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ICSP pads for pogo pins
I'll leave the solder mask question to one of the board gurus (I rarely make boards) although I don't think there should be solder mask over pads as long as Fritzing thinks it is a connector, the pogo pins should work with or without the hole, but with a hole (and a pointed tip pogo pin as opposed to the multi contact head variety) there is somewhere for it to slide in to making alignment somewhat easier in a tight space (I assume you are using less than .1 inch spacing on the pads?). You also need to check that the pogo pins can be stacked together in the space you have (they work fine on .1 spacing and will probably do fine at least somewhat smaller) as I recall the sparkfun ones are fairly fine (I have a variety in different heads and from different sources, some of the cheap surplus ones I have are a lot larger than Sparkfun's. Just some things to thing about 
Peter
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Minature Thermocouple to PCB connector. How Do I Make It?
Don't know that one . I'd expect their web page should have a standard drill size chart, otherwise I think (remembering I don't do boards much ) most fabs round odd drill sizes up to the next size they support. With luck someone with more experience making boards will reply.
Peter
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This program is a piece of ****
I think that the OP may have interrupted the parts update in initial install (which freezes with no indication it is doing anything for quite a while) and corrupted the parts database. After that nothing except deleting the user directories is likely to do much, including removing and reinstalling the software. I can understand his frustration if that's what happened (and he won't have seen any of the good features yet). I guess we will know if he ever comes back and tells us if something worked or has just written Fritzing off.
Peter
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Auto-controlled tractor with Mosfet
Ah, then a single wire from the ground on the arduino battery to the ground on the motor battery (and put the servo ground wire on the same ground as the motor) will do the trick. The schematic will look the same as the connectivity is identical, its just arrangement in the real world that is important. Depending how much current the drive motor takes and how low a voltage it will take while still giving you enough torque to drive your chassis, you may be happier with a pack of AA batteries or
NIMH or LIPO (fire risk though, I usually avoid them) rechargable batteries. The 9 volt batteries are low amp hours and the motor will probably drain them fairly quickly. I'd try a four pack (6V) of AAs and see how the motor runs with them
Peter
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ICSP pads for pogo pins
Most of the test points I've seen on PCB are just plain pads.
If this is a one-off positioned pads are fine, but if you are going to need a lot of these units it's probably faster to make it a part.
I don't know about paste, but checked the gerber output of of Hirose SMD connector and it had the paste in the gerber.
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ICSP pads for pogo pins
But for your connector, you are soldering to it and thus probably want flux. In fact for test/programming pads he also doesn't want copper, but rather a gold connector overlay as for an edge connector on a PCB. I however have no idea how you specify that for a fab house, hopefully one of you experienced board makers can enlighten him (or perhaps he already knows). Copper on the pad will tarnish and likely not make contact with the pogo pin (which is also gold plated for that reason). This may not be something that Fritzing can do as well as I doubt it is very common in simple boards.
Peter
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ICSP pads for pogo pins
I think you can get away with high tin solder because it doesn't tarnish that fast, or maybe not at all.
Like this
I have old circuits with high lead solder that is decades old and it has gone grey.
Yeah gold is the go.
I vaguely remember watching a fab video and you specify whether you want the gold added on top, but that applies to the whole PCB because it's done by electro-plating, so that's probably an extra. You can even get hard gold for sliding contacts.
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Does not run on MacOSSierra
Steps I took that resulted in the problem:
Unzipping the file and moving it to the Programs folder took ages. Then opening it took about 10 minutes. When it 'runs' I only see the magic ball turning. Nothing happens.
What I expected should have happened instead:
A program should function properly
...
My version of Fritzing and my operating system:093B and MacOS Sierra
Please also attach any files that help explaining this problem
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Auto-controlled tractor with Mosfet
Here are the modifications:
I can't find any fault in this circuit.
Still, I can't simulate it at
https://circuits.io/circuits/4017693-ea-motor-sebessegenek-vezerlese-vellenallassal-es-szrttvel
Why?
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Does not run on MacOSSierra
While I'm on Windows not a Mac, the first time Fritzing runs it goes to github (without saying anything!) to update the parts data base. On Windows that looks like it has hung, but if you wait long enough it eventually works. You also need network access to get to github to do the update. Hopefully a Mac person will chime in with better advise
Peter
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Auto-controlled tractor with Mosfet
While I don't know anything about the simulation site, the error message seems to indicate the simulation can't yet handle something you are doing (perhaps the analog stuff which I assume is reading the ldrs?). I do notice that aref is still disconnected which may disable analog reading (as it will in real life, without a reference voltage I don't think the a/d will work). You might try connecting 5 volts to aref and see if that makes it happier.
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ICSP pads for pogo pins
Thanks. I have to keep the costs right down, I'm doing only two layers and the minimum board size for my purpose, I don't think I can afford to use gold, is this a really expensive option?
At the end of the Sparkfun product video for the ISP pogo adapter I mentioned above, the guy demonstrates using the pogo pins on some boards, one is just onto bare vias and the other seems to be onto standard header pin holes. Is there a common practice for this?
The issue I have with the solder paste appearing on the copper pads seems to be due to vias not being through the pad. Here is a screen shot of the ICSP pads on my board viewed in this gerber viewer. The only pad that does not have solder paste on it is the one I have put a via though. Please someone advise what's going on. I'm new to all of this so please forgive my confusion.
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ICSP pads for pogo pins
I don't know but I expect so as gold is expensive as is another step in making the board. As Old_Grey pointed out the pads are solder covered (rather than bare copper, my lack of board experience showing ) so that may work fine for you and will certainly be cheaper. I'd expect the pogo pins should make contact through the solder. It would be worth at least trying on a prototype board I expect.
Peter
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Auto-controlled tractor with Mosfet
I have connected now 5V with AREF but still can't run simulation.
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Auto-controlled tractor with Mosfet
Then it may be that the simulator can't simulate the analog portions (I expect that would be quite difficult to arrange, but I don't know). As I said based on the error message there seems to be a limitation in the simulator. Its documentation may give you more information, or if they have forums like this one ask there.
Peter
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Auto-controlled tractor with Mosfet
Hi Peter,
thank you very much for helping me so far.
Indeed, I'm doing something wrong out there.
No I'm experimenting with my circuit out there and can start simulation.
Best, from Pál
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Auto-controlled tractor with Mosfet
I'm not sure you are doing something wrong as much as running in to a limitation of the simulator. Your circuit looks fine, I suspect the problem is trying to simulate the analog portions of the code. The simulator doesn't have a way (without a lot of complex additions) to know what the value of the analog voltages on the pot and the ldrs are is I suspect the problem . For that you may have to try it with actual hardware, simulation can only take you so far
Peter
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Auto-controlled tractor with Mosfet
Indeed. You are right, Sir!
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ICSP pads for pogo pins
I don't think gold would be that expensive because it's only microns thick.
I don't know much about production houses either, because I DIY at home with a laser printer, a cloths iron, the safer ammonium persulphate, and a drill.
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