- switching to power saving techniques

// This program puts MCU in sleep mode and uses two interrupts to process events in order to save energy
// The first interrupt is generated by PIR sensor output connected to D2 input, the interrupt handler schedules
// transmission of a single byte command with ASCII value of 'o' and disables PIR sensor for a number of WDT interrupts
// The second interrupt is generated by WDT and it fires about every 8 sec.
// This interrupt handler decreases PIR sensor disable counter
- extra power line capacitor added
- "connect" button moved away from the mounting screw