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HELP !! Heated Bed connected directly to Ultimaker PCB

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Help !

This is my 2nd attempt to get this working. I used a switch before to turn on and off my heated bed. But I needed a 2nd micro controller to monitor to the temp and turn the switch on and off.

Right now I currently have it wired according to the 2nd power supply topic on the page


"Secondary DC supply, e.g. 12V for reprap pcbs:

The ground of this supply should be connected to the ground of the Ultimaker supply. Than one power connection of the PCB goes to the +12V of the secondary supply, while the other goes to the pin2 of the HotBed connector of the Ultimaker PCB. Its a lowside n-channel Mosfet circuit, thats why this should work. (I have not tried this personally, please be careful). Then the Ultimaker PCB should be able to control the bed."

2nd Power supply.

19v + -------------------- Heated Bed ---------------- Pin2 Hot_Bed

GND ---------- Ultimaker PCB ground (Power jack)

This does not work..... any idea's why ?

My ultimaker PCB is version 1.5.6

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Yes, It soldered directly to the power input of the 1st power supply.

This is a link to the picture of how its wired up.

https://plus.google.com/photos/10429557 ... 3516558898


The Terminal block is the 2nd power supply. The black color side is GND and the blue (un colored) side is +19v

The White and Black wire are what is run to the headed board.

The Grey wire, is where the 2nd Power supply GND is connected to the 1 st Power supply's GND.

I made the heated board at home, its has not extra components on it. meaning its just a long copper trace. I wonder if I need to add a resistor or LED or something to give the circuit polarity.

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With more testing, I validated that #define HEATER_BED_PIN 4 was set in the Marlin pin define code.

I jumpped a +5v line for the Arduino to Pin3 of the transistor, and the Transistors light came one.

This leads me to believe that the Arduino pin 4 is dead. I'm currently in the process of switching the bed to run from heater 2

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