Low-Profile Vessel Deployed Sensor Transmitter TM4C123GXL Launchpad

IDE Toolchain: Keil MDK 5.3x & Keil MDK Legacy
Hardware Platform: TM4C123GXL Launchpad

Notes: TivaWare & utilities are also contained in this repository.

Libraries used: TivaWare Firmware Library

Every 5 seconds, the MCU wakes up via RTC, samples the sensor data, and sends it through the serial port.

ADC0 channel 0 PE3 as sensor inputs 0-3.3V

Water level reading is converted to six-digit in the format of 12.345

REYX RYLR 896 LoRA Transceiver are used. https://reyax.com/products/rylr896/

Assuming a 1.5K resistor Rref is in series connection with the Etape, Rsense as shown in the simple voltage divider circuit, Vout is connected to PE3 ADC channel 0 input

then:

for 0-1 inches, Rref = 1.5K, Vout = 3.3V/2 = 1.65V; 12-bit ADC value = 2048 for water level, 1 to 8 inches; Vout is linear, 1 inches = 1.5K, Vout = 1.65V; 6inches = 0.70 K, Vout = (0.7)/(1.5+0.7) * 3.3V = 1.05 V, ADC Value = 1303 8 inches = 0.4K, Vout = 3.3 * 0.4/(0.4+1.5) = 0.6947V, ADC value = 862

https://www.digikey.com/en/products/detail/sparkfun-electronics/SEN-10221/5764504;

change to every 2 seconds,
for testing purposes, change the data cycle between 1 inch to 8 inches
add timer_3a to measure the time needed for +OK\r\n responses before "AT+ADDRESS = 101..." is sent, timer reading is: 4262966206; after "+OK\r\n" is recieved, 4255560263, it takes = 7405943 clock cycles for 896 to respond clock frequency = 40 Mhz, time needed for 896 to respond = 0.185 s = 185 ms

Branch01 - new RYLR LoRa transceivers, during the initialization stage, only polling; After LoRa transceiver is initialized, interrupts are enabled.

wang32/LPV-Water-Level-Transceiver-RYLR998

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