extra Fet to ramps 1.4

I've managed to kill 3 fets on D9 somehow, I was extra carefull last time too...

so I've given up trying to replace the fet on D9, managed to damage the tracks a little on the ramps trying to get fets off the board now. so want to try adding a fet on a breadboard to another (pref PWM) pin.

does RAMPS have pinholes for the other arduino PWM pins? - I see there's a couple of aux pins on the ramps board, but can't find any info on them.

X-min and X-max endstop pins are PWMable

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FFF Settings Calculator	Gcode post processors	Geometric Object Deposition Tool Blog
Tantillus.org	Mini Printable Lathe	How NOT to install a Pololu driver

Ijust found this:
[reprap.org]

if I'm reading that right, I can use the servos as well yes?

except I can't really see how to wire it.

I'm a tad electronicaly stupid.

Yes those pins are PMWable.


You want to use a DC motor driver board instead of just the mosfet and resistor.

You could use one like [www.pololu.com] for up to 1A (3A peak) loads or something like [www.pololu.com] for 12A (30A peak).

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FFF Settings Calculator	Gcode post processors	Geometric Object Deposition Tool Blog
Tantillus.org	Mini Printable Lathe	How NOT to install a Pololu driver

The SevenSwitch is a fine solution for driving DC motors as well. Throttling the motor works, if connected to a PWM pin.

Quote

except I can't really see how to wire it.

It's just two pins you have to connect:



"Signal" is the pin which operates the switch. The more tricky part is to get your firmware operating this pin to your wishes. In Teacup additional devices can be defined like another heater, with or without a thermistor. Not sure about other firmwares.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

the firmware is easy.
why do I want a driver rather than a mosfet and resistor?