Hello everybody,
Is there a way to compare the current sensor value with last recorded sensor value when using the platform: template-sensor? My idea is to only record the data of a sensor when the change in data is bigger than a given value. E.g., only record the new data of a temperature sensor when the change since the last recorded data is more than 1°C.
In ESPHome I’m using the lambda filter in a similar way. You can just define a static value like shown below. It keeps the last stored value like you would expect from a static variable in C and than compare this to the new value.
# Only store a new value if the deltato the last stored value is smaller than 0.3
filters:
- lambda: |-
float MAX_DIFFERENCE = 0.3; // adjust this!
static float last_value = NAN;
if (isnan(last_value) || std::abs(x - last_value) < MAX_DIFFERENCE)
{
last_value = x;
return (x*(-1.0));
}
else
return {};
I’m currently struggling to get the last stored value in Home Assistant. Is there a way to do so, no matter if a static variable will be used or an dedicated Home Assistant function.
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