diff --git a/hydrobot_def.json b/hydrobot_def.json
new file mode 100644
--- /dev/null
+++ b/hydrobot_def.json
@@ -0,0 +1,263 @@
+{
+    "devices" : [
+        {
+            "id" : "0x00",
+            "name" : "master",
+            "display" : "Master",
+            "class" : "None"
+        },
+        {
+            "id" : "0x01",
+            "name" : "airsense",
+            "display" : "AirSense",
+            "class" : "AirSenseModule"
+        },
+        {
+            "id" : "0x02",
+            "name" : "relaydrive",
+            "display" : "RelayDrive",
+            "class" : "RelayDriveModule",
+            "io" : [
+                {
+                    "name" : "input_1",
+                    "type" : "input",
+                    "sensor_num" : "1",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                },
+                {
+                    "name" : "input_2",
+                    "type" : "input",
+                    "sensor_num" : "2",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                },
+                {
+                    "name" : "input_3",
+                    "type" : "input",
+                    "sensor_num" : "3",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                },
+                {
+                    "name" : "input_4",
+                    "type" : "input",
+                    "sensor_num" : "4",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                },
+                {
+                    "name" : "input_5",
+                    "type" : "input",
+                    "sensor_num" : "5",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                },
+                {
+                    "name" : "input_6",
+                    "type" : "input",
+                    "sensor_num" : "6",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                },
+                {
+                    "name" : "input_7",
+                    "type" : "input",
+                    "sensor_num" : "7",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                },
+                {
+                    "name" : "input_8",
+                    "type" : "input",
+                    "sensor_num" : "8",
+                    "functions" : [
+                        "digital_in",
+                        "freq_in"
+                    ]
+                }
+            ]
+        },
+        {
+            "id" : "0x03",
+            "name" : "watersense",
+            "display" : "WaterSense",
+            "class" : "WaterSenseModule"
+        },
+        {
+            "id" : "0x04",
+            "name" : "protomodule",
+            "display" : "ProtoModule",
+            "class" : "ProtoModule"
+        }
+    ],
+    "data_keys" : [
+        {
+            "key" : "0x0001",
+            "name" : "digital_in",
+            "display" : "Digital Input",
+            "units" : "bool"
+        },
+        {
+            "key" : "0x0002",
+            "name" : "freq_in",
+            "display" : "Frequency Input",
+            "units" : "Hz"
+        },
+        {
+            "key" : "0x0003",
+            "name" : "analog_in",
+            "display" : "Analog Input",
+            "units" : "V"
+        },
+        {
+            "key" : "0x0004",
+            "name" : "digital_out",
+            "display" : "Digital Output",
+            "units" : "bool"
+        },
+        {
+            "key" : "0x0005",
+            "name" : "pwm_out",
+            "display" : "PWM Output",
+            "units" : "%Duty"
+        },
+        {
+            "key" : "0x0006",
+            "name" : "analog_out",
+            "display" : "Analog Output",
+            "units" : "V"
+        },
+        {
+            "key" : "0x0007",
+            "name" : "air_temp",
+            "display" : "Air Temp",
+            "units" : "degC"
+        },
+        {
+            "key" : "0x0008",
+            "name" : "air_humidity",
+            "display" : "Air Humidity",
+            "units" : "%RH"
+        },
+        {
+            "key" : "0x0009",
+            "name" : "air_pressure",
+            "display" : "Air Pressure",
+            "units" : "hPa"
+        },
+        {
+            "key" : "0x000A",
+            "name" : "ambient_light",
+            "display" : "Ambient Light",
+            "units" : "lux"
+        },
+        {
+            "key" : "0x000B",
+            "name" : "water_temp",
+            "display" : "Water Temp",
+            "units" : "degC"
+        },
+        {
+            "key" : "0x000C",
+            "name" : "water_level",
+            "display" : "Water Level",
+            "units" : "%Full"
+        },
+        {
+            "key" : "0x000D",
+            "name" : "ec",
+            "display" : "Conductivity",
+            "units" : "uS"
+        },
+        {
+            "key" : "0x000E",
+            "name" : "ph",
+            "display" : "pH",
+            "units" : "pH"
+        },
+        {
+            "key" : "0x0100",
+            "name" : "can_id",
+            "display" : "CAN ID",
+            "units" : "hex"
+        },
+        {
+            "key" : "0x0101",
+            "name" : "data_rate",
+            "display" : "Data Rate",
+            "units" : "seconds"
+        },
+        {
+            "key" : "0x0102",
+            "name" : "led_brightness",
+            "display" : "LED Brightness",
+            "units" : "%"
+        },
+        {
+            "key" : "0x0103",
+            "name" : "input",
+            "display" : "Input",
+            "units" : ""
+        },
+        {
+            "key" : "0x0104",
+            "name" : "output",
+            "display" : "Output",
+            "units" : ""
+        }
+    ],
+    
+    "command_keys" : [
+        {
+            "key" : "0x00",
+            "name" : "e_stop",
+            "display" : "E-Stop",
+            "units" : "bool"
+        },
+        {
+            "key" : "0x01",
+            "name" : "silence_bus",
+            "display" : "Silence Bus",
+            "units" : "bool"
+        },
+        {
+            "key" : "0x10",
+            "name" : "set_output",
+            "display" : "Set Output",
+            "units" : "Data Key"
+        },
+        {
+            "key" : "0x11",
+            "name" : "get_data",
+            "display" : "Get Data",
+            "units" : "Data Key"
+        },
+        {
+            "key" : "0x12",
+            "name" : "config",
+            "display" : "Config",
+            "units" : "Data Key"
+        },
+        {
+            "key" : "0x13",
+            "name" : "calibrate",
+            "display" : "Calibrate",
+            "units" : "Data Key"
+        }
+    ]
+}