View source for Reprap Ramps1.4 RRD Fan Extender

== Overview ==

[[Image:Fan1.jpg|500px]]
[[Image:Fan2.jpg|500px]]



If you build or upgrade your printer with/to DUAL-EXTRUSION (2 extruder) including a heated bed all the output ports (D8,D9,D10) will be used. In this case there is
 
not option to connect a firmware controlled FAN to RAMPS board directly. However in Sprinter/Marlin firmware there is an option already (Marlin: BOARD=34) which 

redirects the FAN to RAMPS output D4. But this solution needs a "buffer/driver"in order to work.



The RRD-FAN-EXTENDER is exactly what you need in this case. It is a plug and play solution to mount the FAN for DUAL-EXTRUSION setups with RAMPS1.4. But instead of

adding only one additional output port the RRD-FAN-EXTENDER is equipped with 2 PWM controllabe channels(D6/D11). The second channel can be used for another fan

(e.g. to cool the stepper driver) or for adding light control (e.g. add dimmable LED light to your machine).



== Features: ==

* max 20V

* 2 (PWM controllable) channels (D6/D11)

* max 0.5A per channel (enough for a really big fan)

* flexible output voltage (you can connect the RRD-FAN-EXTENDER to 12V,5V,... in order to support the output voltage you need) 

* each channel has a fly back diode

* easy setup (plug and play)

* already supported by Marlin firmware (choose "#define MOTHERBOARD 34")

* easy to adapapt to other firmware (e.g. Sprinter: just change "#define FAN_PIN 6" in "pins.h")




== Firmware: ==

Firmware:

You need Marlin firmware v3 or newer. If you are using older firmware, you must re-flash your board.

The latest Marlin firmware is available here:https://github.com/ErikZalm/Marlin


Configuration:

as shown in the product description



== TEST ==

Test the Editing Reprap Ramps1.4 RRD Fan Extender

Hardware required:

-[http://www.geeetech.com/ramps-reprap-mega-pololu-a4988-extend-shield-p-606.html Ramps 1.4]

-[http://www.geeetech.com/new-iduino-mega2560-r3-atmega8u2-development-board-p-644.html Mega2560 board]

1.Upload Test for Editing Reprap Ramps1.4 RRD Fan Extender to your Mega.

2.Connecting follow this picture:


[[Image:Fan4.jpg]]


3. Power up ,two fans will take turns to rotate