Night-Light Pennant with LilyMini ProtoSnap
Gella 
Installing Your Battery and Testing
Insert the coin cell battery into the LilyMini’s battery holder with the positive (+) side facing up. Press the power button on the LilyMini; all four LEDs should light up (Mode 1). Press the LilyPad button to switch between modes. Cover the light sensor in each mode to check the stitches are connecting to the sensor. If so, remove the battery and continue to the Finishing Touches section.
Troubleshooting
With any electronics project, there are times you will have to troubleshoot if your circuit isn't working. If your circuit isn't lighting up, try a new battery or check that your project is switched on. Check your sewing for any loose threads or ends that may be touching other parts of your circuit and causing a short circuit. Learn more about troubleshooting your project in the LilyPad Basics: E-Sewing tutorial.