HVAC thermostat is not controllable from HASS

[andrewhack]

Hi,
Am I missing something - can't control the target temperature from HASS.
Changing the mode is working fine.
I am using the provided HVAC example with Arduino Mega and Ethernet shield.

These are the features which I am using

HAHVAC::TargetTemperatureFeature | HAHVAC::PowerFeature | HAHVAC::ModesFeature

[andrewhack]

My investigation shows that mqtt "mode" and "target temp" entries are missing, just "current temp" is available.
I assume there is no initial or not complete mqtt setup.

Can somebody assist here?

[MarshallVisions]

am having the same problem... find a solution by any chance? mine worked for over a year but stopped working. I think it stopped working after I started a new Home Assistant.

[simbycube]

same problem for me too.

[shotreal]

same issue here. If you publish something to the [...]/temp_cmd_t topic then itll work

[MarshallVisions]

still not sure how I fixed it, but the following code works for me for being able to set the 'Target Temperature' and also show the 'Current Temperature'. Hope this helps someone. It's a retrofitted thermostat which fits on top of my dumb apartment thermostat and uses a servo to move the thermostat adjustment arm.

#include <Arduino.h>
#include <WiFi.h>
#include <ESP32Servo.h>
#include <DHT.h>
#include <ArduinoHA.h>

// WiFi Settings
const char *ssid = "MV-Terminal_2.4GHz";
const char *password = "************";
IPAddress local_IP(192, 168, 0, 215);
IPAddress gateway(192, 168, 0, 1);
IPAddress subnet(255, 255, 255, 0);

// MQTT Settings
#define mqttServer IPAddress(192, 168, 0, 126)
// const int mqttPort = 1883;
const char *mqttUser = "MQTT-User";
const char *mqttPassword = "***********";

// DHT11 Settings
#define DHTPIN 4 // DHT11 data pin
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
float dhtOffset = -5;
float dhtLastCheck;
float dhtCheckInterval = 1000;

// Home Assistant Settings
// Entity Settings
WiFiClient wifiClient;
HADevice device("RetroStat-Basic");
HAMqtt mqtt(wifiClient, device);
HAHVAC climate(
    "retrostat-hvac", HAHVAC::TargetTemperatureFeature);

HANumber humidity("RetroStat-Basic-Humidity");
HANumber dhtOffsetNumber("RetroStat-Basic-DHT-Offset");

// Servo Settings
Servo servo;
const int servoPin = 7;

// Temperature Settings
float currentTemperature = 20; // Initial temperature set to 20 degrees
float targetTemperature = 20;
const float minTemp = 10;
const float maxTemp = 35;

// Function declarations
void setServoPosition(int temp);
void onTargetTemperatureCommand(HANumeric temperature, HAHVAC *sender);
void onDhtOffsetCommand(HANumeric value, HANumber *sender);

void setup()
{
    Serial.begin(115200);
    dht.begin();
    servo.attach(servoPin, 500, 2500);

    // Connect to WiFi
    Serial.println("Connecting to WiFi...");
    // WiFi.config(local_IP, gateway, subnet);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED)
    {
        delay(500);
        Serial.print(".");
    }
    Serial.println("WiFi connected");

    // Connect to MQTT
    Serial.println("Connecting to MQTT...");
    mqtt.begin(mqttServer, 1883, mqttUser, mqttPassword);
    mqtt.setDataPrefix("homeassistant/climate"); // not fully sure about this one. defaults to "aha"

    // Initialize Home Assistant components
    device.setName("RetroStat Basic");
    device.setSoftwareVersion("2.0.0");
    device.setManufacturer("MarshallVisions");
    device.setModel("RS-Basic");
    device.enableSharedAvailability();
    device.enableLastWill();
    climate.setName("RetroStat");
    climate.setMinTemp(minTemp);
    climate.setMaxTemp(maxTemp);
    climate.setCurrentTemperature(currentTemperature);
    climate.setTargetTemperature(targetTemperature);
    climate.setRetain(true);
    climate.onTargetTemperatureCommand(onTargetTemperatureCommand);
    humidity.setName("Humidity");
    humidity.setRetain(true);
    dhtOffsetNumber.setName("DHT Temperature Offset");
    dhtOffsetNumber.setRetain(true);
    dhtOffsetNumber.onCommand(onDhtOffsetCommand);

    Serial.println("Setup complete.");
}

void loop()
{
    mqtt.loop();

    if (millis() - dhtLastCheck > dhtCheckInterval)
    {
        // Read temperature from DHT11
        float temp = dht.readTemperature() + dhtOffset;
        float hum = dht.readHumidity();
        currentTemperature = temp;
        climate.setCurrentTemperature((float)currentTemperature);
        humidity.setState(hum);
        dhtLastCheck = millis();
        Serial.print("Current temperature from DHT11: ");
        Serial.println(temp);
        Serial.print("Current humidity from DHT11: ");
        Serial.println(hum);
    }
}

void setServoPosition(int temp)
{
    int pos = map(temp, minTemp, maxTemp, 180, 0);
    Serial.print("Setting servo position to: ");
    Serial.println(pos);
    servo.write(pos);
}

// Function to handle target temperature command from Home Assistant
void onTargetTemperatureCommand(HANumeric temperature, HAHVAC *sender)
{
    float temperatureFloat = temperature.toFloat();
    if (temperatureFloat >= minTemp && temperatureFloat <= maxTemp)
    {
        targetTemperature = temperatureFloat;
        Serial.print("Target temperature command received. New target temperature: ");
        Serial.println(temperatureFloat);
        setServoPosition(targetTemperature);
        sender->setTargetTemperature(temperature); // report target temperature back to the HA panel
    }
}

void onDhtOffsetCommand(HANumeric value, HANumber *sender)
{
    float offsetFloat = value.toFloat();
    if (offsetFloat >= -10 && offsetFloat <= 10)
    {
        dhtOffset = offsetFloat;
        Serial.print("DHT value command received. New value: ");
        Serial.println(offsetFloat);
        dhtLastCheck = millis();
        sender->setState(dhtOffset);
    }
}

[andrewhack]

still not sure how I fixed it, but the following code works for me for being able to set the 'Target Temperature' and also show the 'Current Temperature'. Hope this helps someone. It's a retrofitted thermostat which fits on top of my dumb apartment thermostat and uses a servo to move the thermostat adjustment arm.

#include <Arduino.h>
#include <WiFi.h>
#include <ESP32Servo.h>
#include <DHT.h>
#include <ArduinoHA.h>

// WiFi Settings
const char *ssid = "MV-Terminal_2.4GHz";
const char *password = "***********";
IPAddress local_IP(192, 168, 0, 215);
IPAddress gateway(192, 168, 0, 1);
IPAddress subnet(255, 255, 255, 0);

// MQTT Settings
#define mqttServer IPAddress(192, 168, 0, 126)
// const int mqttPort = 1883;
const char *mqttUser = "MQTT-User";
const char *mqttPassword = "***********";

// DHT11 Settings
#define DHTPIN 4 // DHT11 data pin
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
float dhtOffset = -5;
float dhtLastCheck;
float dhtCheckInterval = 1000;

// Home Assistant Settings
// Entity Settings
WiFiClient wifiClient;
HADevice device("RetroStat-Basic");
HAMqtt mqtt(wifiClient, device);
HAHVAC climate(
    "retrostat-hvac", HAHVAC::TargetTemperatureFeature);

HANumber humidity("RetroStat-Basic-Humidity");
HANumber dhtOffsetNumber("RetroStat-Basic-DHT-Offset");

// Servo Settings
Servo servo;
const int servoPin = 7;

// Temperature Settings
float currentTemperature = 20; // Initial temperature set to 20 degrees
float targetTemperature = 20;
const float minTemp = 10;
const float maxTemp = 35;

// Function declarations
void setServoPosition(int temp);
void onTargetTemperatureCommand(HANumeric temperature, HAHVAC *sender);
void onDhtOffsetCommand(HANumeric value, HANumber *sender);

void setup()
{
    Serial.begin(115200);
    dht.begin();
    servo.attach(servoPin, 500, 2500);

    // Connect to WiFi
    Serial.println("Connecting to WiFi...");
    // WiFi.config(local_IP, gateway, subnet);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED)
    {
        delay(500);
        Serial.print(".");
    }
    Serial.println("WiFi connected");

    // Connect to MQTT
    Serial.println("Connecting to MQTT...");
    mqtt.begin(mqttServer, 1883, mqttUser, mqttPassword);
    mqtt.setDataPrefix("homeassistant/climate"); // not fully sure about this one. defaults to "aha"

    // Initialize Home Assistant components
    device.setName("RetroStat Basic");
    device.setSoftwareVersion("2.0.0");
    device.setManufacturer("MarshallVisions");
    device.setModel("RS-Basic");
    device.enableSharedAvailability();
    device.enableLastWill();
    climate.setName("RetroStat");
    climate.setMinTemp(minTemp);
    climate.setMaxTemp(maxTemp);
    climate.setCurrentTemperature(currentTemperature);
    climate.setTargetTemperature(targetTemperature);
    climate.setRetain(true);
    climate.onTargetTemperatureCommand(onTargetTemperatureCommand);
    humidity.setName("Humidity");
    humidity.setRetain(true);
    dhtOffsetNumber.setName("DHT Temperature Offset");
    dhtOffsetNumber.setRetain(true);
    dhtOffsetNumber.onCommand(onDhtOffsetCommand);

    Serial.println("Setup complete.");
}

void loop()
{
    mqtt.loop();

    if (millis() - dhtLastCheck > dhtCheckInterval)
    {
        // Read temperature from DHT11
        float temp = dht.readTemperature() + dhtOffset;
        float hum = dht.readHumidity();
        currentTemperature = temp;
        climate.setCurrentTemperature((float)currentTemperature);
        humidity.setState(hum);
        dhtLastCheck = millis();
        Serial.print("Current temperature from DHT11: ");
        Serial.println(temp);
        Serial.print("Current humidity from DHT11: ");
        Serial.println(hum);
    }
}

void setServoPosition(int temp)
{
    int pos = map(temp, minTemp, maxTemp, 180, 0);
    Serial.print("Setting servo position to: ");
    Serial.println(pos);
    servo.write(pos);
}

// Function to handle target temperature command from Home Assistant
void onTargetTemperatureCommand(HANumeric temperature, HAHVAC *sender)
{
    float temperatureFloat = temperature.toFloat();
    if (temperatureFloat >= minTemp && temperatureFloat <= maxTemp)
    {
        targetTemperature = temperatureFloat;
        Serial.print("Target temperature command received. New target temperature: ");
        Serial.println(temperatureFloat);
        setServoPosition(targetTemperature);
        sender->setTargetTemperature(temperature); // report target temperature back to the HA panel
    }
}

void onDhtOffsetCommand(HANumeric value, HANumber *sender)
{
    float offsetFloat = value.toFloat();
    if (offsetFloat >= -10 && offsetFloat <= 10)
    {
        dhtOffset = offsetFloat;
        Serial.print("DHT value command received. New value: ");
        Serial.println(offsetFloat);
        dhtLastCheck = millis();
        sender->setState(dhtOffset);
    }
}

Probably this create the missing MQTT entries - this is what I found (mentioned above)
Thank you for sharing this, I will test it.

[myriaxis]

@andrewhack , @MarshallVisions , @shotreal
Hi, I'm having the same issue where I can't control the target temperature from HASS thermostat. I only have current temperature and mode selection.
I'm using an Arduino Nano ESP32 and coding on IDE 2.3.6 with all the latest libraries.
I compared MarshallVisions's code with mine and I don't see what I'm missing. What needs to be added to the Arduino code to add missing mqtt entries and make it work?
Also, shotreal suggested to publish something to the [...]/temp_cmd_t topic. How can I do that?

Your help would be greatly appreciated.

[myriaxis]

@dawidchyrzynski
I'm having the same issue where I can't control the target temperature from HASS thermostat. I only have current temperature and mode selection.
I am using the provided HVAC example with an Arduino Nano ESP32 and coding on IDE 2.3.6 with all the latest libraries.
Please help.

[cjbaar]

Not sure if this is related, but I am trying to build a thermostat device, and I have noticed that HA send the value for target with precision P1, even though I have P0 defined for the device. So when I select "75" in the UI, it actually publishes "75.0". I have confirmed that the onTargetTemperatureCommand callback is run, but it seems to die in the call to HANumeric.fromStr(), so it doesn't take any action on the command. I think this may be because setting the precision for the device does not actually set the HA parameter "precision" in the serializer.