Google did not return anything about problems using the 9-volt and arduino with PIR sensor.
- The 9 -volt is charged and works fine. I already tested it with meter.
- The PIR/Sketch/Circuit etc works fine and does exactly what it should when Arduino is plugged into the USB.
When I use the Battery through the jack however, I first get about 5 seconds of rapid flickering of the test LED followed by no response of the PIR sensor.
What am I missing? Voltage regulation issues with batter and PIR? do I need some other component in the circuit when using a 9-volt? Capacitor?
Any help is greatly appreciated.