Edit Project: ESP8266-DS18S20

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{{Marked as outdated|The system-to-be-installed uses Tasmota firmware combined with an [[MQTT]] script}} This code is '''deprecated''' and had been replaced by the [[SpaceAPI#the_firmware|new SpaceAPI's]] space state Also, the code is somewhat ugly, but it worked.. === synopsis === This sketch provides a webserver-like interface and provides a json file (somewhat compatible with [[SpaceAPI]]). The json will provide the DS18S20 temperature sensor's address and temperature in &deg;C, and will look like: <pre> { "sensors":{ "ext_temp_count":2, "temperature":[ { "ext_index":0, "value":-127.0, "unit":"&deg;C", "ext_address":"00112233445566" }, { "ext_index":0, "value":85.0, "unit":"&deg;C", "ext_address":"99AABBCCDDEEFF" } ] } } </pre> Note: the ''ext_temp_count'' and ''ext_index'' fields are only visible in debug mode (GPIO0 pulled to ground) === code === <div class="mw-collapsible mw-collapsed" id="mw-customcollapsible-ESP8266-DS18S20_ino"> ==== ESP8266-DS18S20.ino ==== <div class="mw-customtoggle-ESP8266-DS18S20_ino mw-code">Click here to view the source code</div> <pre class="mw-collapsible-content"> /* 2015-07-04: Created by xopr Code based on http://iot-playground.com/2-uncategorised/41-esp8266-ds18b20-temperature-sensor-arduino-ide by Igor Jarc External libraries: - https://github.com/milesburton/Arduino-Temperature-Control-Library This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. */ #include <ESP8266WiFi.h> #include <OneWire.h> #include <DallasTemperature.h> // AP definitions #define AP_SSID "ACKspaceWifi" #define AP_PASSWORD "nospacenet" #define ONE_WIRE_BUS 2 // DS18B20 pin OneWire oneWire( ONE_WIRE_BUS ); DallasTemperature DS18B20( &oneWire ); WiFiServer server( 80 ); void setup() { Serial.begin( 115200 ); // Make sure GPIO doesn't float if we try and read it pinMode( 0, INPUT_PULLUP ); wifiConnect( ); } const char* strIndent = " "; bool bDebug; void loop() { float temp; // Check if a client has connected WiFiClient client = server.available( ); if ( !client ) return; // Wait until the client sends some data Serial.println( "new client" ); while(!client.available( )) delay(1); DS18B20.begin(); // Read the first line of the request String req = client.readStringUntil( '\r' ); Serial.println( req ); client.flush( ); bDebug = !digitalRead( 0 ); DS18B20.requestTemperatures( ); //delay(1); uint8_t nDevicecount = DS18B20.getDeviceCount( ); // Output JSON, keep the spaceAPI (v0.13) standard. // NOTE: proper json decoders handle utf-8 at least. Also, you need this for the degree symbol client.print( "HTTP/1.1 200 OK\r\nContent-Type: application/json;charset=utf8\r\n\r\n" ); client.print( "{\n" ); client.print( strIndent ); client.print( "\"sensors\":{\n" ); if ( bDebug ) { client.print( strIndent ); client.print( strIndent ); client.print( "\"ext_temp_count\":" ); client.print( nDevicecount ); client.print( ",\n" ); } client.print( strIndent ); client.print( strIndent ); client.print( "\"temperature\":[\n" ); for ( uint8_t nDevice = 0; nDevice < nDevicecount; nDevice++ ) { DeviceAddress address; byte nTry = 10; boolean bFail = true; // Try and retrieve the sensor's value while ( nTry-- && bFail ) { if ( DS18B20.getAddress( address, nDevice ) ) { temp = DS18B20.getTempCByIndex( nDevice ); if ( temp == 85.0 || temp == ( -127.0 ) ) bFail = true; else bFail = false; } delay(1); } if ( nTry ) { // Sensor client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( "{\n" ); // sensor index (in debug only) if ( bDebug ) { client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( "\"ext_index\":" ); client.print( nDevice ); client.print( ",\n" ); } // Temperature value client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( "\"value\":" ); if ( temp == ( -127.0 ) ) client.print( "null," ); else if ( temp == 85.0 ) client.print( "false," ); else client.print( temp ); client.print( ",\n" ); // Temperature unit client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( "\"unit\":\"°C\",\n" ); // Sensor address client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( "\"ext_address\":" ); client.print( "\"" ); client.print( address[1], HEX ); client.print( address[2], HEX ); client.print( address[3], HEX ); client.print( address[4], HEX ); client.print( address[5], HEX ); client.print( address[6], HEX ); client.print( address[7], HEX ); client.print( "\"\n" ); client.print( strIndent ); client.print( strIndent ); client.print( strIndent ); client.print( "}" ); if ( nDevice + 1 < nDevicecount ) client.print( "," ); client.print( "\n" ); } // /Sensor } client.print( strIndent ); client.print( strIndent ); client.print( "]\n" ); client.print( strIndent ); client.print( "}\n}" ); delay(1); Serial.println("Client disonnected"); // The client will actually be disconnected // when the function returns and 'client' object is detroyed } void wifiConnect() { Serial.print( "Connecting to " ); Serial.print( AP_SSID ); WiFi.begin( AP_SSID, AP_PASSWORD ); while ( WiFi.status() != WL_CONNECTED ) { delay( 1000 ); Serial.print( "." ); } Serial.println( "" ); Serial.println( "WiFi connected" ); server.begin(); Serial.println( "Server started" ); // Print the IP address Serial.println(WiFi.localIP( ) ); } </pre> </div> [[Category:ESP8266]][[Category:SpaceAPI]][[Category:Network]]

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