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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by LukeZ on September 15, 2021, 01:35:52 PM »
Hi Chi-el, sorry you're having all these problems, and sorry also for the slow reply.

At this point we are back to the basics. First of all, make doubly sure that you are connecting the ISP cable to the board correctly. You might take a photo of the orientation you've been using so I can double check.

You could also try buying a different USBASP (maybe yours is defective).

If you have an off-the shelf Arduino board lying around, you could also try using the USBASP to put a bootloader on that. Open the Arduino IDE, in the Tools menu select your Arduino Board type to match whatever kind of Arduino you have, under Programmer select USBASP, and then select Burn Bootloader (Arduino already knows the stock bootloaders for all boards). Of course your off-the-shelf Arduino will already have a bootloader on it, you'll just be overwriting it with the same thing, but if this works it would tell us your USBASP is functioning, which might lead us to think there is still something wrong with your TCB boards.
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by Chi-el on September 13, 2021, 10:51:11 AM »
Hi Luke,

Got the crystals soldered on and was deeply hoping the board to light up, but it still gives the exact same message as before  :o.
Tried it again with different power sources, both USB and external 15V. Does the USBasp require anything else done in preparation other then the driver and jumper switch to 5V?
I have no other clue on what to try next  :-\
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by LukeZ on September 09, 2021, 10:02:21 AM »
Yes that is correct. In fact they are not exactly square, they are slightly rectangular, so you do need to place it so that it matches the footprint lengthwise. But other than that it doesn't matter which end is which.
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by Chi-el on September 09, 2021, 05:34:48 AM »
Hi Luke,

For what I was able to find so far, the crystals do not have any specific orientation due to polarity or ground etc, correct?
It can be randomly placed because it is mirrored right?

Regards,
Chi-el
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by Chi-el on September 06, 2021, 01:19:35 PM »
Thank you so much!!  8)

I'm going to have chat with the maker first!
Will revert once I have some crystals in place!
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by LukeZ on September 06, 2021, 12:10:14 AM »
Hi Chi-el, thanks for the photos - I definitely do see a problem: they appear to have forgotten to install the crystal. Without that the processor will definitely not work. This is part XT1, I've highlighted it in the attached picture.

I just checked the BOM and it looks like the original crystal is no longer available, maybe that is why they didn't install it (still they should have told you). At least at DigiKey in the US it looks like the replacement is ABM8G-16.000MHZ-18-D2Y-T3.

I don't know if you'll be able to source this in Europe but I think DigiKey should ship to you, though I don't know how expensive it will be or how long it will take. There may be other substitutes that would work as well. I'm travelling right now and don't have a lot of time, I'll be back home the middle of next week and if you haven't been able to source a part I will do some more searching then.

This part is SMD with the solder pads on the underneath side of the chip, so it would have been a lot easier to install it during manufacturing. But from your picture I can see there is solder on all the pads already and you might be able to get it on by hand with a soldering iron, or with a heat gun if you have one of those (but be careful with the heat gun because it is easy to re-melt other parts and blow them away).

You asked about the FTDI Friend, we now know what the problem is but I wanted to answer that question anyway. The FTDI Friend is similar to the USB port on the board, in both cases they connect to a serial port on the Mega processor. We use these serial ports to easily load firmware and read information from the chip.

The problem is, when the chip is brand new it doesn't know how to do anything at all - the serial ports aren't even enabled and it doesn't matter what information we send over serial, the chip isn't listening. The bootloader is a small program that gives it the basic functionality of communication. Because we can't yet use serial, this very first small program can only be loaded through the ISP port which is specially designed for this purpose. So for this first step we must use something like the USBASP.

After we get the bootloader on (which we leave on forever and never delete), we can then communicate over serial (via USB or the FTDI Friend), and that is much easier and we can tell the chip to do whatever we want, load different programs, whatever.

Anyway, the crystal is necessary before anything can be done, so I have high hopes that if you can install that you will find the remaining steps will work as expected.
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by Chi-el on September 04, 2021, 03:13:36 PM »
Hi Luke,

I now tried it with an external power supply, up to 15V, desperately expecting the TCB to light up like a christman tree, but no luck.
Figured there might be something wrong with the chip, so tried the second board, but the same message comes up with both boards.
Starting to look like something went wrong with fabrication perhaps?

Attached some pictures in case something might stick out ( I'm aware the radio connection isn't populated).
After a very close look, I did find 2 chip soldering connections that where connected with a tiny bit of solder, I cut it out with a hobby knife.

Is the FTDI friend a more secure way to flash the chip?

[EDIT]: Added the batch file as well, just in case.
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by LukeZ on September 04, 2021, 10:08:51 AM »
You're right, the USB cable should provide enough power, but since you are having issues I would recommend disconnecting the USB and giving it power with a battery through the main power connector.
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Show and Tell / Re: High speed tracked vehicle....something different
« Last post by Chi-el on September 04, 2021, 02:50:50 AM »
Hi Luke,

I did try it once by moving the jumper on the USBasp to the 5V position, will try that again.

I powered the TCB through the USB connection as shown in the instructions, but should it get more power? I can try it with the USB cable hooked up to an adapter or powerbank instead?
Or should it be powered through the main power connector only or together with a USB cable?
Since the picture in the instructions only showed the USB cable I only tried that.

Thanks for your time!
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Show and Tell / Re: 1/16 Sd.KFz.231
« Last post by Sub on September 03, 2021, 06:16:41 PM »
Hi Jhamm.
Thats great work, a really nice model.
Thanks for sharing. :)
Regards.
Sub.
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