PWM fan speed control with a 12F683

[AvionicsMaster1]

Using Sayzer's code, attached, I've been able to control an LED as desired.

Coupling that to a larger current drawing device is a problem. Of the schematic page provided, the top drawing has pulses at GP2 to the MOSFET of about 2.3 volts and won't power on the fan. I thought once I figured out how to get the pulses up to around 5 volts the FET would turn on and I'd be golden.

The lower schematic adds R1 and R2 so I get around 4.8 volt peaks with varying RMS values but even with the larger pulse size it still won't turn on the fan. I felt really stupid after I figured that one out.

I can connect the gate to +5V and it will turn the FET on and drive the fan. Although I don't think it's bringing the fan up to full speed.

So what in hell am I missing? Why won't the chip drive the FET to turn on the fan?