OpenMQTTGateway/main/sensorDS1820.cpp

/*  
  Theengs OpenMQTTGateway - We Unite Sensors in One Open-Source Interface

   Act as a wifi or ethernet gateway between your 433mhz/infrared IR/BLE signal  and a MQTT broker 
   Send and receiving command by MQTT
 
    DS1820 1-wire temperature sensor addon
  
    Copyright: (c) 2020 Lars Wessels
  
    This file is part of OpenMQTTGateway.
    
    OpenMQTTGateway is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenMQTTGateway is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "User_config.h"

#ifdef ZsensorDS1820
#  include <DallasTemperature.h>
#  include <OneWire.h>

#  include "TheengsCommon.h"
#  include "config_DS1820.h"

OneWire owbus(DS1820_OWBUS_GPIO);
DallasTemperature ds1820(&owbus);
DeviceAddress ds1820_address, ds1820_devices[OW_MAX_SENSORS];

static uint8_t ds1820_count = 0;
static uint8_t ds1820_resolution[OW_MAX_SENSORS];
static String ds1820_type[OW_MAX_SENSORS];
static String ds1820_addr[OW_MAX_SENSORS];

extern void createDiscovery(const char* sensor_type,
                            const char* st_topic, const char* s_name, const char* unique_id,
                            const char* availability_topic, const char* device_class, const char* value_template,
                            const char* payload_on, const char* payload_off, const char* unit_of_meas,
                            int off_delay,
                            const char* payload_available, const char* payload_not_available, bool gateway_entity, const char* cmd_topic,
                            const char* device_name, const char* device_manufacturer, const char* device_model, const char* device_id, bool retainCmd,
                            const char* state_class, const char* state_off, const char* state_on, const char* enum_options, const char* command_template);

void setupZsensorDS1820() {
  Log.trace(F("DS1820: configured pin: %d for 1-wire bus" CR), DS1820_OWBUS_GPIO);
  ds1820.begin();

  // Search the OneWire bus for all devices
  uint8_t numDevicesOnBus = ds1820.getDeviceCount();

  // locate device(s) on 1-wire bus
  Log.notice(F("DS1820: Found %d devices" CR), numDevicesOnBus);

  // Cycle though all of the devices on the OneWire bus
  for (int deviceIndex = 0; deviceIndex < numDevicesOnBus && ds1820_count < OW_MAX_SENSORS; deviceIndex++) {
    // get the next device on the OneWire bus and confirm it is a sensor the library can handle (Dallas DS18X20 1-wire devices)
    if (ds1820.getAddress(ds1820_address, deviceIndex) && ds1820.validFamily(ds1820_address)) {
      ds1820_addr[ds1820_count] = String("0x");
      for (uint8_t i = 0; i < 8; i++) {
        if (ds1820_address[i] < 0x10) ds1820_addr[ds1820_count] += String("0");
        ds1820_devices[ds1820_count][i] = ds1820_address[i];
        ds1820_addr[ds1820_count] += String(ds1820_address[i], HEX);
      }

      // set the resolution and thus conversion timing
      if (ds1820_address[0] == 0x10) {
        // DS1820/DS18S20 have no resolution configuration register,
        // both have a 9-bit temperature register. Resolutions greater
        // than 9-bit can be calculated using the data from the temperature,
        // and COUNT REMAIN and COUNT PER °C registers in the scratchpad.
        // The resolution of the calculation depends on the model.
        ds1820_type[ds1820_count] = String("DS1820/DS18S20");
      } else if (ds1820_address[0] == 0x28) {
        // DS18B20 and 18B22 are capable of different resolutions (9-12 bit)
        ds1820_type[ds1820_count] = String("DS18B20");
        ds1820.setResolution(ds1820_address, DS1820_RESOLUTION);
      } else if (ds1820_address[0] == 0x22) {
        ds1820_type[ds1820_count] = String("DS1822");
        ds1820.setResolution(ds1820_address, DS1820_RESOLUTION);
      } else {
        ds1820_type[ds1820_count] = String("DS1825");
        ds1820.setResolution(ds1820_address, DS1820_RESOLUTION);
      }
      ds1820_resolution[ds1820_count] = ds1820.getResolution(ds1820_address);
      Log.trace(F("DS1820: Device %d, Type: %s, Address: %s, Resolution: %d" CR),
                ds1820_count,
                (char*)ds1820_type[ds1820_count].c_str(),
                (char*)ds1820_addr[ds1820_count].c_str(),
                ds1820_resolution[ds1820_count]);
      ds1820_count++;
    }
  }

  if (ds1820.getDS18Count() == 0) {
    Log.error(F("DS1820: Failed to enumerate sensors on 1-wire bus. Check your GPIO assignment!" CR));
  }

  // make requestTemperatures() non-blocking
  // we've to take that conversion is triggered some time before reading temperature values!
  ds1820.setWaitForConversion(false);
}

void pubOneWire_HADiscovery() {
  // If zmqttDiscovery is enabled, create a sensor topic for each DS18b20 sensor found on the bus, using addr as uniqueID
#  ifdef ZmqttDiscovery
#    include "config_mqttDiscovery.h"

  // If zmqtt discovery is enabled, create a sensor topic for each DS18b20 sensor found on the bus, using addr as uniqueID
  if (SYSConfig.discovery) {
    for (int index = 0; index < ds1820_count; index++) {
      createDiscovery("sensor",
                      (char*)(String(OW_TOPIC) + "/" + ds1820_addr[index]).c_str(),
                      (char*)("DS12B20_" + String(index + 1) + "_c").c_str(),
                      (char*)(ds1820_addr[index] + "_c").c_str(),
                      will_Topic,
                      "temperature",
                      jsonTempc,
                      "", "", "°C",
                      0, "", "", true, "",
                      "", "", "", "", false,
                      stateClassMeasurement // state class
      );
    }
  }
#  endif
}

void MeasureDS1820Temp() {
  static float persisted_temp[OW_MAX_SENSORS];
  static unsigned long timeDS1820 = 0;
  static boolean triggeredConversion = false;
  float current_temp[OW_MAX_SENSORS];

  // trigger temperature conversion some time before actually
  // calling getTempC() to make reading temperatures non-blocking
  if (!triggeredConversion && ((millis() - timeDS1820) > (DS1820_INTERVAL_SEC * 1000UL - DS1820_CONV_TIME))) {
    Log.trace(F("DS1820: Trigger temperature conversion..." CR));
    ds1820.requestTemperatures();
    triggeredConversion = true;
  } else if (triggeredConversion && ((millis() - timeDS1820) > DS1820_INTERVAL_SEC * 1000UL)) {
    timeDS1820 = millis();
    triggeredConversion = false;

    if (ds1820_count < 1) {
      Log.error(F("DS1820: Failed to identify any temperature sensors on 1-wire bus during setup!" CR));
    } else {
      Log.trace(F("DS1820: Reading temperature(s) from %d sensor(s)..." CR), ds1820_count);
      StaticJsonDocument<JSON_MSG_BUFFER> DS1820dataBuffer;
      JsonObject DS1820data = DS1820dataBuffer.to<JsonObject>();

      for (uint8_t i = 0; i < ds1820_count; i++) {
        current_temp[i] = round(ds1820.getTempC(ds1820_devices[i]) * 10) / 10.0;
        if (current_temp[i] == -127) {
          Log.error(F("DS1820: Device %s currently disconnected!" CR), (char*)ds1820_addr[i].c_str());
        } else if (DS1820_ALWAYS || current_temp[i] != persisted_temp[i]) {
          DS1820data["tempf"] = (float)DallasTemperature::toFahrenheit(current_temp[i]);
          DS1820data["tempc"] = (float)current_temp[i];

          if (DS1820_DETAILS) {
            DS1820data["type"] = ds1820_type[i];
            DS1820data["res"] = String(ds1820_resolution[i]) + String("bit");
            DS1820data["addr"] = ds1820_addr[i];
          }
          String origin = String(OW_TOPIC) + "/" + ds1820_addr[i];
          DS1820data["origin"] = origin;
          enqueueJsonObject(DS1820data);
          if (SYSConfig.powerMode > 0)
            ready_to_sleep = true;
        } else {
          Log.trace(F("DS1820: Temperature for device %s didn't change, don't publish it." CR), (char*)ds1820_addr[i].c_str());
        }
        persisted_temp[i] = current_temp[i];
      }
    }
  }
}
#endif