Use this script to measure water level with a A121 radar sensor (https://www.waveshare.com/a121-range-sensor.htm) in conjunction with a esp32 Board running tasmota.

• flash i2c_distance_detector.bin into the A121-stm board
• edit A121_tasmota.be with your own values

------ configuration -----------

static A121_ADDRESS = 0x52
static A121_BUSYPIN = 18
static A121_WAKEUPPIN = 17        # not used
static A121_min_depth = 500.0     # entspricht dem Abstand Abstand des Sensors bei maximaler Wasserhöhe
static A121_max_depth = 3500.0    # Messwert wenn Tank leer ist
static A121_LITER_PER_MM   = 1.2  # conversion factor

• flash a esp32 board with tasmota https://tasmota.github.io/docs/ (use a version with berry script enabled)
• upload this script to the esp32 board
• connect I²C SDA and SCL pins of the A121 sensor to the corresponding pins on the esp32 board
• connect VCC of the A121 sensor to the 5V pin of the esp32 board
• connect GND of the A121-GND to the GND pin of the esp32 board

This script is heavily inspired by acconeer A121_Distance_Detector.py

see also:

• https://www.waveshare.com/a121-range-sensor.htm