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Hydreon RG-15 Solid State Rain Sensor

??? failure "This feature is not included in precompiled binaries"

When [compiling your build](Compile-your-build) add the following to `user_config_override.h`:
```arduino
#ifndef USE_HRG15
#define USE_HRG15    // Add support for Hydreon RG-15 Solid State Rain sensor (+1k5 code)
#endif
```

The Hydreon RG-15 Solid State Tipping Bucket is a rainfall measuring device intended to replace conventional tipping buckets.

The RG-15 uses beams of infrared light within a plastic lens about the size of a tennis ball. The round surface of the lens discourages collection of debris, and the RG-15 has no moving parts to stick, and no water-pathways to clog. The device features an open-collector output that emulates a conventional tipping bucket, as well as serial communications that provide more detailed data and allow for configuration of the device.

Find out more on the manufacturer's website.

Configuration

Wiring

HRG15 ESP
GND (1) GND
V+ 3.3V (8) 3.3V
RS232 Out (4) GPIOx
RS232 In (5) GPIOy

Tasmota Settings

In the Configuration -> Configure Module page assign:

  • GPIOx to HRG15 Rx
  • GPIOy to HRG15 Tx

Commands

Sensor90 can be used to configure the rain sensor

Tasmota Display

After a reboot the driver will detect the sensor and show the sensor data. An example is given below:

Item Value
RG-15 Active 0.01 mm
RG-15 Event 0.13 mm
RG-15 Total 26.8 mm
RG-15 FlowRate 0.32 mm.h

This data is also part of the tele/%topic%/SENSOR payload:

{
    "Time": "2021-08-25T17:15:45",
    "RG-15": {
        "Active": 0.01,
        "Event": 0.13,
        "Total": 26.80,
        "FlowRate": 0.32
    },
    "TempUnit": "C"
}

MQTT

The sensor data is made available over MQTT as per the configured TelePeriod. Additionally, instant telemetry messages are sent during active rainfall events. The sensor will report additional accumulation every 5-60 seconds. The driver resets the Active and FlowRate values to 0 if no additional accumuatlion is detected after 60 seconds.