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Step 5Soldering pulldown resistors
I actually made a silly mistake here in my circuit. Not that it doesn't work, it just does not plug in directly to the Arduino. So you can either follow my faulty version which is also what the pictures are of, or you can follow the text bellow that offers a more ideal way of connecting.
MY WAY
Cut a 6 x 7 hole piece of perfboard (copper lines running the shorter, 6 hole, length). Cut a row of 7 female headers and solder them to the first row of 7 holes. Solder 20K resistors between the third hole and each of the 4 holes next to it. Also see photos for instruction.
Solder the ends of all four (red) cables coming from the corners of your knit touchpad to the other end of the perfboard so that each input runs to the ground through a resistor. Solder the (red) wire coming form the finger cap to one of the two leftover holes on the perfboard that does not pass through a resistor and goes directly to the header. To connect this version to your Arduino you will need to use a piece of rainbow wire that connects things in the right way. The inputs from the four corners should go to your first four analog inputs. The header that is connected to the other end of all the resistors should go to your GND and the header that goes directly to your finger cap should connect to the +5V. See photos!
BETTER WAY
Cut a 6 x 9 hole piece of perfboard (copper lines running the shorter, 6 hole, length). Cut a row of 4 male headers and solder them to the first four holes in the row of 9 holes. Cut 2 male headers and solder them to the last two holes in the same row of 9 holes. Solder 20K resistors between each of the 4 male headers and the closest of the two male headers - these match up with your Arduino board. Solder the ends of all four (red) cables coming from the corners of your knit touchpad to the other end of the perfboard so that each input runs into a resistor. Solder the (red) wire coming form the finger cap to the left over header in the corner. Now this should fit directly on top of your Arduino and should be able to plug the male headers sticking out of your perfboard into the first 4 analog inputs and the two headers should plug into your GND and +5V. See sketch!
MY WAY
Cut a 6 x 7 hole piece of perfboard (copper lines running the shorter, 6 hole, length). Cut a row of 7 female headers and solder them to the first row of 7 holes. Solder 20K resistors between the third hole and each of the 4 holes next to it. Also see photos for instruction.
Solder the ends of all four (red) cables coming from the corners of your knit touchpad to the other end of the perfboard so that each input runs to the ground through a resistor. Solder the (red) wire coming form the finger cap to one of the two leftover holes on the perfboard that does not pass through a resistor and goes directly to the header. To connect this version to your Arduino you will need to use a piece of rainbow wire that connects things in the right way. The inputs from the four corners should go to your first four analog inputs. The header that is connected to the other end of all the resistors should go to your GND and the header that goes directly to your finger cap should connect to the +5V. See photos!
BETTER WAY
Cut a 6 x 9 hole piece of perfboard (copper lines running the shorter, 6 hole, length). Cut a row of 4 male headers and solder them to the first four holes in the row of 9 holes. Cut 2 male headers and solder them to the last two holes in the same row of 9 holes. Solder 20K resistors between each of the 4 male headers and the closest of the two male headers - these match up with your Arduino board. Solder the ends of all four (red) cables coming from the corners of your knit touchpad to the other end of the perfboard so that each input runs into a resistor. Solder the (red) wire coming form the finger cap to the left over header in the corner. Now this should fit directly on top of your Arduino and should be able to plug the male headers sticking out of your perfboard into the first 4 analog inputs and the two headers should plug into your GND and +5V. See sketch!
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Jan 4, 2011. 1:56 PMBarsoomian
says:
Hi, I was wondering if you remembered which corners were attached to which analog input port on the arduino?
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