I have a requirement in which I need to run 2 motors and 6 servos. The motors and servos won't be running simultaneously at any given time. what best can I use. I Was hoping to use l293d shield as it powers 2 DC motors and 2 servos, but how do I get other 4 running too ?
I'm aware that l293d shield has 2 free pins pin2 and pin13 that I leverage for signal pins for servo. (am I right in this ?, if so, i'll still need 2 more free pins for signal)
As to the PDF Guide on page 19:
How can I connect to the unused pins?
The analog pins (analog 0-5 also known as digital pins 14-19) are broken out in the bottom right corner.
Pin 2 has a small breakout since its the only truly unused pin
The remaining pins are not broken out because they could be used by the motor shield. If you are sure that you are not using those pins then you can connect to them by using stacking headers when assembling the kit or soldering onto the top of the header with wires, or using a "Wing shield"
So you should have access to pins A0 to A5 (enough for 6 servos). You might need to solder a pin header in that place before you can actually use them.
The wording "Pin 2 [...] the only truly unused pin" is a bit weird, but if you follow the link to the schematics repo and look at mshieldv12schem.png (which seems to be the schematic just as an image, so you don't need to install Eagle for viewing it) it shows the Arduinos pins A0 to A5 only connected to the pin header and nothing else. This tells me that they are actually free.
