no Temperature value

[ghost]

Hello,
I have already installed the Plugin but i get 0 degrees. When i read manually the values of the Sensor i get 23 degrees. I use already the right Sensor id. Any ideas? I use i2c Bus for the Connection to the Sensor

[lagunacomputer]

How does this work? I have the plugin installed on my Homebridge pi server, and I can get the Accessory to show up in Home/HomeKit on my iphone, but there is no temp reading. Am I missing some arduino code or pi code? where do I hook the sensor to? what is the other half of this piece? Also, how do I format the device ID address? ie "device": "28-0000063f4ead" does not equal "
0x28, 0x4D, 0xAA, 0xCB, 0x04, 0x00, 0x00, 0x9C" thanks

[DanTheMan827]

In regards to usage

You need to find the sensor ID, you can run the following command after loading the kernel modules

ls /sys/bus/w1/devices/

If you don't have the modules loaded you'll have to run this before running this plugin

sudo modprobe w1-gpio
sudo modprobe w1-therm

As far as the plugin reporting 0 degress... what does it say if you try to run cat on the file w1_slave located in /sys/bus/w1/devices/*

[lagunacomputer]

duh, obviously i need to connect the sensor directly to my pi/homebridge server. I guess i was thinking it would magically report from my arduino running homebridge-http plugin. I will work on that and get back to you, thanks

[DanTheMan827]

If you want something for handling remote temperature sensors you can use https://github.com/lucacri/homebridge-http-temperature-humidity

That works very nicely... if you only have a DS18B20 just set humidity = false in the homebridge config

If you want something super cheap for scattering temperature sensors around the house I would give the NodeMCU a try... it's a cheap Wi-Fi board that can be programmed with the Arduino IDE

And another positive about that board is that there are internal pull-up resistors so you don't even need them for the DS18B20 sensor (well, I've tried it with a single one-wire device connected... more may not work...)

[lagunacomputer]

wow, thanks man, I am now getting temp in F using a ds18b20 on an arduino, and it shows up in Home/Homekit over my homebridge pi server. I just cant get the Temp value to show correct, but i faked the Hudity value of the plugin and its working correctly under the other accessory, so I know it can work

Thanks for your direction man

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = { 192, 168, 1, 201 }; // ip in lan
byte gateway[] = { 192, 168, 1, 1 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
EthernetServer server(80); //server port

String readString;

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

/-----( Declare Constants )-----/
#define ONE_WIRE_BUS 2 /-(Connect to Pin 2 )-/

/-----( Declare objects )-----/
/* Set up a oneWire instance to communicate with any OneWire device*/
OneWire ourWire(ONE_WIRE_BUS);

/* Tell Dallas Temperature Library to use oneWire Library */
DallasTemperature sensors(&ourWire);

/-----( Declare Variables )-----/

//////////////////////

void setup(){

pinMode(5, OUTPUT); //pin selected to control
//start Ethernet
Ethernet.begin(mac, ip, gateway, gateway, subnet);
server.begin();
//enable serial data print
Serial.begin(9600);

sensors.begin();

}

void loop(){

float temperatureIndoor;
float temperatureOutdoor;
delay(10);
// Create a client connection
EthernetClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();

    //read char by char HTTP request
    if (readString.length() < 100) {

      //store characters to string 
      readString += c; 
      //Serial.print(c);
    } 

    //if HTTP request has ended
    if (c == '\n') {

      ///////////////
   /*   Serial.println(readString); //print to serial monitor for debuging 

      client.println("HTTP/1.1 200 OK"); //send new page
      client.println("Content-Type: text/html");
      client.println();

      client.println("<HTML>");
      client.println("<HEAD>");
      client.println("<TITLE>Arduino GET test page</TITLE>");
      client.println("</HEAD>");
      client.println("<BODY>");

      client.println("<H1>Simple Arduino button</H1>");

      client.println("<a href=\"/?on\">ON</a>"); 
      client.println("<a href=\"/?off\">OFF</a>"); 
      client.println("<a href=\"/?temp\">temp</a>"); 

      client.println("</BODY>");
      client.println("</HTML>");

      delay(1);

*/

      client.println("HTTP/1.1 200 OK");
      client.println("Content-Type: application/json;charset=utf-8");
      client.println("Server: Arduino");
      client.println("Connnection: close");
      client.println();
      sensors.requestTemperatures(); // Send the command to get temperatures
      temperatureIndoor = (sensors.getTempFByIndex(0));
      temperatureOutdoor = (sensors.getTempFByIndex(0));

      client.print("{\"temperature\":");
      client.print(temperatureIndoor);
      client.print(",");
      client.print("\"humidity\":");
      client.print(temperatureOutdoor);

      client.print("}");
      client.println();





      //stopping client
      client.stop();

      ///////////////////// control arduino pin
      if(readString.indexOf("?on") >0)//checks for on
      {
        Serial.println(readString.indexOf("on"));

        digitalWrite(5, HIGH);    // set pin 5 high
        Serial.println("Led On");

      }
      if(readString.indexOf("?off") >0)//checks for off
      {
        Serial.println(readString.indexOf("off"));
        digitalWrite(5, LOW);    // set pin 5 low
        Serial.println("Led Off");
      }
      if(readString.indexOf("?temp") >0)//checks for off
      {
        Serial.println(readString.indexOf("temp"));



        //digitalWrite(5, LOW);    // set pin 5 low
        Serial.println("temp sent");
      }



      //clearing string for next read
      readString="";

sensors.requestTemperatures(); // Send the command to get temperatures
Serial.print("Device 1 (index 0) = ");
Serial.print(sensors.getTempFByIndex(0));
Serial.println(" Degrees F");

    }
  }
}

}
}

[lagunacomputer]

ah "if you only have a DS18B20 just set humidity = false", duh, thanks again

[lagunacomputer]

thanks man, got the HomeKit Accessory Room Temp thing value to work correctly by changing the value to get celcius instead: temperatureIndoor = (sensors.getTempCByIndex(0)); using https://github.com/lucacri/homebridge-http-temperature-humidity and your suggestions

[Pistooli]

Also just wanted to confirm, that your plugin works nicely on my setup. Just connected simply the DS18B20+ sensor to my Pi (which is the Homebridge) and shows the temperature in HomeKit as it should. Brilliant! Many thanks!

[toshibochan]

@Pistooli how you setup your DS18B20 on your PI? and how config?
i want use DS18B20 waterproof sensor in my pool.
https://www.amazon.com/dp/B00KLZQ0P8/_encoding=UTF8?coliid=I1I08Y9WAHJ21C&colid=2C3RKYX98VWKZ

[toshibochan]

how this homebridge know what pin I'm using for DS18B20?

[lagunacomputer]

you connect it to a GPIO pin. I believe the homebridge plugin uses I2C and just scans the bus for devices

https://www.modmypi.com/blog/ds18b20-one-wire-digital-temperature-sensor-and-the-raspberry-pi

https://cdn-learn.adafruit.com/downloads/pdf/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing.pdf

[toshibochan]

@lagunacomputer thanks! i will buy the sensor and give a try!!!