I have a modbus device with address 26 that shows the temperature, here are its data types on the screenshot, I can’t understand how to write all this in yaml correctly.
I write this
modbus:
- name: modbus_hub
type: tcp
host: 192.168.0.15
port: 502
sensors:
- name: sensor1
address: 26
how to correctly specify the type, address, etc. ?
there are two temperature sensors at address 26, they must be separated, please show me an example.
???
Maybe this:
modbus:
- name: modbus_hub
type: tcp
host: 192.168.0.15
port: 502
sensors:
- name: sensor1
address: 8
input_type: input
data_type: float16 # or maybe int16
swap: byte # for little endian. Modbus is usually big endian, yours is not, see below
26 it is device ID
and 8 is address of register if I understand correctly
Then you need:
not 26.
You also need this:
Because the default input type for a sensor is “holding”
Well, where to write 26 ? I understand that without it it is not clear from which device to read data, with address 8 I have many other devices.
Ah ok, then try this:
modbus:
- name: modbus_hub
type: tcp
host: 192.168.0.15
port: 502
sensors:
- name: sensor1
slave: 26 # <- Device address
address: 8 # <- Register address
input_type: input
data_type: float16 # or maybe int16
swap: byte # for little endian. Modbus is usually big endian, yours is not, see below
You can also use device_address: instead of slave: if you don’t like that word.
I can’t link directly to this in the documentation because it has the same relative url as another section but it is there at the top of the entities configuration section, it applies to all entities:
I started to get values from the sensor, it’s temperature in Celsius, but it’s not right
When the type int16 outputs the value -16639
When type float16 outputs -1.25
The correct value should be about 27.9.
I have a modifier in iridium that converts the value
function modify_m1w2 (in_Type, in_Name, in_Value)
{
in_Value *= 0.0625;
return in_Value;
}
that is just multiplying by 0.0625;
but I don’t understand how this can be applied in a yaml file ?
First try int16 and float16 without the line swap: byte
Then if that does not look any better you can use these options:
This will fit a linear calibration of the form y = mx + c
please give me an example in yaml, I dont understed how to use offset or scale
modbus:
- name: modbus_hub
type: tcp
host: 192.168.0.15
port: 502
sensors:
- name: sensor1
slave: 26 # <- Device address
address: 8 # <- Register address
input_type: input
data_type: int16 # or maybe int16
scale: 0.0625
Work only like that I received 28 but real value was 27.812500
how to get at least double decimal precision ?
First of all you have only calibrated at one point. That may not be enough.
You need to make a list of at least three sets of these value pairs (widely spaced apart in actual value if possible):
Reported by modbus, Actual value.
Then I’ll work out the linear equation for you.
I’m sorry, but I’m not quite sure what I’m supposed to do.
And I also have this modifier for other modbus metrics.
function modify_Kitchen_P (in_Type, in_Name, in_Value)
{
in_Value = (in_Value-830)/37.5;
if (in_Value > 100)
{
in_Value = 100;
}
if (in_Value < 0)
{
in_Value = 0;
}
return in_Value.toFixed();
}
so here the value must be subtracted, divided and there is a condition, can this be realized in home assistant ?
I just need to call the function
Just tell me three of these number pairs.
28 27.875000
11 10.687500
2048 2047.937500
Is this with your scaling factor?
Looks like you don’t need an offset.
This is the option you need to set for more decimals:
precision: 2
works! thanks!
but what about this function How to add this modbus sensor to yaml - #12 by mill7
it can be prescribed to change the incoming value ?
Yes you can do that with the offset and scale. the limits can be set with the min and max value options.
I need to apply the formula in_Value = (in_Value-830)*0.026666 to the value from the modbus sensor; that is, first do the subtraction and then the multiplication, using offset: -830 and scale: 0.026666 on the docks, multiplication occurs first, and then subtraction, can this be changed somehow ?
Expanding your equation:
(in_Value-830)*0.026666
= in_Value*0.026666 - 830*0.06666
= in_Value*0.026666 - 22.13278
Therefore use scale = 0.026666 and offset = -22.13278
I have the same problem! When the sensor is connected, the readings differ from the real ones.
The SHT20 sensor reads both temperature and humidity. If I read only one value (either temperature or humidity), then the readings are correct, but if I read both, then the temperature is too low and the humidity is too high!
I understand that you can write a correction, but:
sensors:
- name: 'Температура'
scan_interval: 5
slave: 1
scale: 0.01
address: 1
data_type: int16
input_type: input
unit_of_measurement: °C
device_class: temperature
state_class: measurement
precision: 2
- name: 'Влажность'
scan_interval: 5
slave: 1
scale: 0.01
address: 2
data_type: int16
input_type: input
unit_of_measurement: '%'
device_class: humidity
state_class: measurement
precision: 2