https://github.com/Tech500/HVAC-System-Monitor Reads environmental data and logs HVAC run time of blower using MPU6050 to sense vibration using variance thresholds for on and off, Blower cycles to off, sends alertFlag and blower data; to inside node, sending LoRa Wake-On-Radio (WOR) preamble. Outside node using SX1262 rxDutyCycle detects valid preamble, asserts DIO1 interrupt, wakes deep sleeping ESP32-S3, reads wake-up reason. If wake reason is undefined executes a cold boot, immediate SX1262 reset, arms rxDutyCycle, puts ESP32-S3 to deep sleep. If wake reason is by EXT0, does a warm boot, skipping immediate SX1262 reset, not to lose IRQ flag, reads IRQ. Preamble detected = 0x0004, Reads and sends BME280 data to inside node, ESP32-S3 arms rxDutyCycle, then goes to to deep sleep, Inside node populates variables for perpetual Google Sheet, then inside node using HTTP Client, sends Google Sheet variables. Inside node awaits next alertFlag from blower cycling to off.

SX1262 rxDutyCycle is an autonomous receive mode that has a receive window of 8 ms and a sleep window of ~ 5 seconds --repeating continuously --with no intervention from the ESP32-S3 --which remains in deep sleep until a valid LoRa WOR preamble is detected.

Project consists of six components: 2, Ebyte, EoRa-S3-900TB Development boards, 1, ESP32-S3 SuperMini (check pin layout, some clone layouts are different), 2, BME280 6 pin (GY-BME280-3.3V), and 1, MPU6050.and assorted headers.