Rule to calculate the difference in temperatures. The result of the calculation is always positive ( The abs() (absolute value) function returns the non-negative magnitude of a number, regardless of its sign).
{
"name": "Temperature measurements Changes > Calculate ABS T difference",
"actions": [
{
"if": {
"or": [
{
"changes": {
"operand": {
"device": {
"devices": [ "-- ID Temperature Measurement Device 1 --" ],
"component": "main",
"capability": "temperatureMeasurement",
"attribute": "temperature",
"trigger": "Always"
}
}
}
},
{
"changes": {
"operand": {
"device": {
"devices": [ "-- ID Temperature Measurement Device 2 --" ],
"component": "main",
"capability": "temperatureMeasurement",
"attribute": "temperature",
"trigger": "Always"
}
}
}
}
],
"then": [
{
"command": {
"devices": ["-- ID Number Field Device --"],
"commands": [
{
"component": "main",
"capability": "legendabsolute60149.textFormula",
"command": "setTextFormula",
"arguments": [{"string": "-"}]
}
]
}
},
{
"sleep": {
"duration": {
"value": {
"decimal": 2.0
},
"unit": "second"
}
}
},
{
"command": {
"devices": [ "-- ID Number Field Device --" ],
"commands": [
{
"component": "main",
"capability": "legendabsolute60149.numberFieldOne",
"command": "setNumberFieldOne",
"arguments": [
{
"device": {
"devices": [ "-- ID Temperature Measurement Device 1 --" ],
"component": "main",
"capability": "temperatureMeasurement",
"attribute": "temperature"
}
}
]
}
]
}
},
{
"sleep": {
"duration": {
"value": {
"decimal": 1.0
},
"unit": "second"
}
}
},
{
"command": {
"devices": [ "-- ID Number Field Device --" ],
"commands": [
{
"component": "main",
"capability": "legendabsolute60149.numberFieldTwo",
"command": "setNumberFieldTwo",
"arguments": [
{
"device": {
"devices": [ "-- ID Temperature Measurement Device 2 --" ],
"component": "main",
"capability": "temperatureMeasurement",
"attribute": "temperature"
}
}
]
}
]
}
},
{
"sleep": {
"duration": {
"value": {
"decimal": 1.0
},
"unit": "second"
}
}
},
{
"if": {
"greaterThan": {
"left": {
"device": {
"devices": [
"-- ID Temperature Measurement Device 1 --"
],
"component": "main",
"capability": "temperatureMeasurement",
"attribute": "temperature"
}
},
"right": {
"device": {
"devices": [
"-- ID Temperature Measurement Device 2 --"
],
"component": "main",
"capability": "temperatureMeasurement",
"attribute": "temperature"
}
}
},
"then": [
{
"command": {
"devices": ["-- ID Number Field Device --"],
"commands": [
{
"component": "main",
"capability": "legendabsolute60149.textFormula",
"command": "setTextFormula",
"arguments": [{"string": "1-2"}]
}
]
}
}
],
"else": [
{
"command": {
"devices": ["-- ID Number Field Device --"],
"commands": [
{
"component": "main",
"capability": "legendabsolute60149.textFormula",
"command": "setTextFormula",
"arguments": [{"string": "2-1"}]
}
]
}
}
]
}
}
]
}
}
]
}
The implementation is based on choosing a calculation formula depending on the sign of the difference between the measurement values.
Example calculation (App Number Field Device’s History)
