[SOLVED] I want to set a temperateure value with air-conditioner

Setup, Configuration and Use Items & Sitemaps
1

Hi i’m biginner plzz help me :
is ther a way to set the state of raspberry pi’s GPIO with setpoint items.
-i have an LED1 conect on GPIO “pin17”

  • an auther LED2 conect on GPIO “pin15”
    -an ESP8266 send a sensor datta (ambiant_temp) to the broker via MQTT ( it’s working)
  • i want :
    if (setpoint value) >(ambiant_temp) ==> LED1= alight
    if (setpoint value) <(ambiant_temp) ==> LED2= alight
    else LED1=LED2=0
2

Have you taken a look at the GPIO Binding?

This can also easily be done through with the Exec Binding

3

yes i have insttaled gpio binding and I tested it with a simpl exempl and it’s working now i need how i can configure my rules for having my task

29746353_1406144502825143_1826417713_o%20(1)
29746353_1406144502825143_1826417713_o (1).png720×1280 34.6 KB

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4 
var setPoint = 18.0

rule "Thermostat"
when
    Item MQTTItem changed
then
    var ambientTemp = MQTTItem.state as Number
    if (setPoint > ambientTemp) {
        GPIO1Item.sendCommand(ON)
        GPIO2Item.sendCommand(OFF)
    } else if (setPoint < ambientTemp) {
        GPIO1Item.sendCommand(OFF)
        GPIO2Item.sendCommand(ON)
    } else {
        GPIO1Item.sendCommand(OFF)
        GPIO2Item.sendCommand(OFF)
    }
end
5

thank you very much vzorglub :slight_smile: .

can you explain to me about GPIO item , i don’t understand where is GPIO’s topic , and how to command it .

6

From the photo you posted above, I’m not sure how that GPIO binding is in play. THe photo is just primarily showing you are able to get data from MQTT.

https://docs.openhab.org/addons/bindings/gpio1/readme.html

7

thank you lucky
yes ; but now i’m trying an auther exemple the GPIO bindig is already installed and i have tested it in my last exemple,
now about this rule programme i want to understand how can i command gpio pins in item

8

Show us your items that are bound to the GPIO channels

9

my item

item
item.png1282×289 24.1 KB

sitmap
sitmap
rule
Capture

10

thank you very much ,
it’s working :slight_smile:

11

If you are planning to drive a large appliance with this code (air conditionner, boiler…) you will eventually damage it because you are going to turn it on and off a lot.

You need to add an offset (A small band off temperature where appliance will remain in one state instead of oscillating between the two)

var setPoint = 18.0
var offset = 1.0

rule "Thermostat"
when
    Item MQTTItem changed
then
    var ambientTemp = MQTT.state as Number
    var turnOnTemp = setPoint + (offset / 2)
    var turnOffTemp = setPoint - (offset /2)
    if (ambientTemp >= turnOnTemp) {
        GPIO1Item.sendCommand(OFF)
        GPIO2Item.sendCommand(ON)
    } else if (ambientTemp <= turnOffTemp) {
        GPIO1Item.sendCommand(ON)
        GPIO2Item.sendCommand(OFF)
    }
end

This way, the air con will turn on when the temperature is above 18.5 and turn off when below 17.5.
You can adjust the value, but it you make the offset too narrow, you will risk damaging your unit.

12

thank you very much vzorglub , i have problem about setpoint , when i use sitemap for chenging setpoint and command a temperature . this solution does not working
and those are my sitemap, items and rules:

sifou-1
sifou-1.PNG691×429 14.6 KB

sifou-2
sifou-2.PNG676×567 26.6 KB

sifou-3
sifou-4
sifou-4.PNG1358×518 43.7 KB

13

First line of your rules

var setPoint = apt_t.state as Number

Is in the wrong place. That will not work as a global variable in the rule file.
Put that line inside the rule before turnOnTemp = setPoint + (offset / 2)

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