Original Nophead Firmware

Hello,
I was one of the first who got a kit from nophead and have been happy with the Mendel90 ever since. Now, the Melzi board had a defect and I replaced it with a (real) Melzi v2.
The problem is: When enabling the fan, the heatbed starts heating instead and the heatbed command doesn't do anything.
I saved a hex file on the very first day, years ago and it works fine (on both boards).
Unfortunatly it is not as simple as switching the pins in pins.h.
Any ideas? Does someone have an old firmware version for me? I am getting the same error with this version [github.com]

There are no differences firmware wise between the Melzi we supplied and the Melzi V2, as supplied by RepRapPro. I recently tested a Melzi V2 with the original firmware, so I can't explain your symptoms.

The bed MOFSET does get very hot because the ground track leading to it is very thin, the main ground plane has been isolated by a new track running through it. It needs bridging with a wire.


Also the motor drives get hotter because the ground plane is similarly bisected by a track reducing the heatsink area.

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[www.hydraraptor.blogspot.com]

Are you sure you have wired the bed and fan to the correct terminals?

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[www.hydraraptor.blogspot.com]

I assume it has to be a software issue since the original hex file works just fine. So the wiring should be correct.
Btw I changed the hotend to a E3Dv6 in the process but adjusted the TEMP_SENSOR constant as well.
I just don't see the correlation between fan and hotbed.

Edited 1 time(s). Last edit at 10/30/2016 07:03AM by r00t.

It makes no sense to because the firmware has never changed in that respect. The my version on github has very few changes and works on all the boards we sold and also on a Melzi v2. Presumably the hex file you have is just an older version of what is on github? You can look at the commit list and see there were no changes to the I/O throughout Mendel90 kit production. Is is possible you have a duff version of the Melzi board support folder in the version of Arduino that you are using?

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[www.hydraraptor.blogspot.com]

That was what I was thinking too (though very unlikely). I tried two different Atmega1284p folders.
Tried another new v1 Melzi, same fault.
What version of Arduino are you using? I got 1.5.8.

Edited 2 time(s). Last edit at 10/30/2016 09:13AM by r00t.

I use anything between 1.0.0 and 1.0.5. I don't think my fork of Marlin even complies with 1.5.x, so I don't see how you managed to use that.

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[www.hydraraptor.blogspot.com]

That was it! It compiled fine under 1.5.8.
Compiling it under 1.0.5 with the Gen7 support core (http://reprap.org/wiki/Gen7_Arduino_IDE_Support) fixes it.
Thank you!

You should be using the Melzi BSP, not gen7. I think gen7 runs at 20mHz.

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[www.hydraraptor.blogspot.com]

There are various clock speeds selectable.