Arduino Mega G-Code FWD

[noctis 0]

Hello Community

I'm trying to connect an second arduino with the Mega from the Ultimaker electronics. My plan was to connect the second to an free RX/TX port on the Mega to add an custom G-Code for changing the color. (e.g G66 255, 255, 255)

I don't know if the electronics uses the PWM outputs from the Mega. If so, I need an extra board. If not - direct attach the Dioder Lights to the Mega with a Darlington Array and an extra power supply. (from here: http://ikennd.ac/blog/2011/09/arduino-dioder-part-one/)

An example would be to change the Color every line or to change the light when finished printing with start end G-Code)

Can somebody help me with the programming in Marlin and tell me wich pins are reserved/used?

Greets, Noc

 

[Daid 306]

Lots of pins are used, but even more are free. But what's even easier to use for this, is the 2nd heater output. This heater output is PWM enabled, can be used with "M42 P4 S[pwm_value]" (For heater 2)

You should check the PCB layout for details which pins go where http://reprap.org/wiki/Ultimaker's_v1.5.7_PCB

 

[noctis 0]

Yeah, thanks for that Link!

So I'll have to use expansion 3. Based on 2 RGB Channels, I need 6 PWM outputs.

The 1.5.7 Electronic has an LEDs output Pin. How much Power does it support?

I messured 18,8V. That would be perfect for the Dioder (with a step-down Board)

The Wiki says: "A PWM output with power for LED arrays and other lighting"

What is the exact current?

Thanks!