mintemp error

[zhangxueyou]

Of course, when the printer is turned on, 0/0 left side is the temperature read by thermistor, right side is set temperature.
When you connect the hotbed thermistor to exutruder pin, is the reading correct?
I think you'd better take a video, so that we can better understand your problem.

[jgvonk]

Perhaps this is the problem; When I first connect the USB and then turn on the power of the printer I get mintemp. In this situation the Arduino/Ramps is getting power of your USB connection first and it will not start correctly when you turn on the power.

So first turn on the power of the printer and then connect the USB cable to your computer, this works for me.

[ii3edus]

Well i figured it out on my own.ordered a new iduino mega r3 board.came in and installed it. Allowed it to install drivers and the boom room temp readings from the thermistors. So the board is bad. Good thing came with 12 month warranty