The second channel can be used for another fan (e.g. Instead of adding only one additional output port, the RRD-FAN-EXTENDER is equipped with 2 PWM controllable channels. It's a plug and play solution to mount the FAN for DUAL-EXTRUSION setup with RAMPS1.4.
PIXIE is a chainable, dual 5x7 LED dot-matrix display platform that offers full bitmap control with 7-bit global PWM and high refresh rates! PIXIE - Chainable, Dual 5*7 Micro-LED Displays! by Lixie Labs.
