ultimachine / mini-rambo Goto Github PK
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This project forked from johnnyr/mini-rambo
It looks like the license file is missing. Is it buried under some directories?
Ola amigos pode me orientar com faço ligação da mini Rambo no Arduino para bootloader piscar pois não consigo firmware piscar tanto via IDE Arduino ou Prusa Slicer, achei apenas esquema para Einsy Rambo.
Erro
avrdude: stk500v2_setparm (): falha ao definir o parâmetro 0x9e
avrdude: stk500v2_command (): status desconhecido 0xc8
avrdude: falha na inicialização, rc = -1
Verifique as conexões e tente novamente ou use -F para ignorar
esta verificação.
avrdude: stk500v2_command (): status desconhecido 0x01
avrdude: stk500v2_disable (): falha ao sair do modo de programação
Ocorreu um erro enquanto o sketch era carregado
The PrjPcb claims there's a BomDoc. But that isn't in the repository, so there's a complaint when opening the project. Either remove the reference or upload the file.
I don't know if this is the right place to report this but I have found an issue with the design of mini-Rambo board supplied with original Prusa i3 Mk2s where the board would not detect an open-circuit heat-block thermistor, thus risking overheating or worse.
The problem is caused by the voltage on zener diode D12 being too low due to insufficient zener current and/or device tolerances. On my board the voltage was about 4.4V rather than 4.7.
A new diode did not help but increasing the zener current to just over 3mA by reducing the value of the 10K dropper gives the correct voltage. The thermistor failure is now detected.
I started a thread in the Prusa Research support forum here:
https://shop.prusa3d.com/forum/hardware-firmware-and-software-help-f44/danger-extruder-thermistor-failsafe-didn-t-work-t27201.html
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