USB Biofeedback Game Controller

Step 3 Preparing the bottom of the project enclosure

Next we'll prepare the Arduino project enclosure. 

First, trim down the two middle supports on the bottom of the enclosure. Leave enough height so that they will still go through your Arduino mounting holes but not go past the Arduino headers. (Pic 1)

Next, place one of the muscle sensors in the bottom left of the enclosure by sliding the bottom left support through the muscle sensor's mounting hole (the one near the female headers). Straighten the sensor by rotating it around the support such that its sides are parallel with the enclosures. Gently and such that you don't jostle the sensor board, slide your plastic insert onto the enclosure and hold it above the sensor. Now, look down the rectangular cutout on your insert and verify the three male headers of your sensor are directly below. If not, remove the insert, adjust the sensor position and repeat until it is in position. Once it is in position, mark the location of the muscle sensor's second mounting pin, remove the sensor, and drill the hole. 

Note: If you don't get the hole in exactly the right position, it's OK you can just widen the cutout more to compensate.