I have a Sanguinololu 1.3a. For connecting the heat bed (PCB Mk2) I have built a seven switch using the pcb from Traumflug, because apart from the dimensioning of the mosfet and the connector I was a little bit concerned about routing the heat bed current through the sanguinololu board at all.
Now, the seven switch just needs the (pwm) signal for the heat bed and ground. The obvious solution would be to de-solder the heat bed mosfet and replace it with a connector so I can get the signal to the seven switch.
However, I was wondering if there was a less intrusive solution, like using another pin somewhere on the board which is accessible and can be enabled in the firmware accordingly. I am asking because I don't feel really comfortable with desoldering the mosfet from the board (the board was pre-assembled from the UK and I have so far never (de)soldered lead-free - supposing the board has been assembled using lead-free solder).
Now, the seven switch just needs the (pwm) signal for the heat bed and ground. The obvious solution would be to de-solder the heat bed mosfet and replace it with a connector so I can get the signal to the seven switch.
However, I was wondering if there was a less intrusive solution, like using another pin somewhere on the board which is accessible and can be enabled in the firmware accordingly. I am asking because I don't feel really comfortable with desoldering the mosfet from the board (the board was pre-assembled from the UK and I have so far never (de)soldered lead-free - supposing the board has been assembled using lead-free solder).