The attached PDF file contains a full description of the development, including schematics, and all the software is in the attached. This design proved very reliable and had a battery life of at least 2.5 years. The version here is new and differs only from the previous version in that it is now on printed circuit boards but the electronics and program design is the same. It had a fundamental rework 4 years ago but still on prototype boards. This is a development of a project I started over 5 years ago. The receiver is permanently active and is powered via a USB power supply. The receiver part also uses an ATmega328P and an NRF24L01 together with a sounder and LEDs to indicate the presence of post items and the battery condition of the transmitter. It is optimized for very low power consumption. It periodically scans (every 32 seconds) and transmits status data including the detection status and battery condition to the receiver. The sensor array uses a reflection and beam break principle to detect objects in the mailbox. The transmitter uses an ATmega328P and an NRF24L01 2.5GHz transceiver module together with an infrared sensor array embedded in a mat on the base of the mailbox. Note that you still need to have a registration number for that avatar, meaning you need to buy another server inworld and rezz it to get your registration number for that 2nd avatar.It consists of a battery operated transmitter part and a receiver part.
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