/* Copyright (c) 2015, Majenko Technologies All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * * Neither the name of Majenko Technologies nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* Create a WiFi access point and provide a web server on it. */ #include #include #include #include #ifndef APSSID #define APSSID "TempMonitor" #define APPSK "12345678" #endif #define TEMPERATURE_READ_DELAY_COUNTER 100000 /* Set these to your desired credentials. */ const char *ssid = APSSID; const char *password = APPSK; const double VCC = 3.3; // NodeMCU on board 3.3v vcc const double R2 = 10000; // 10k ohm series resistor const double adc_resolution = 1023; // 10-bit adc const double A = 0.001129148; // thermistor equation parameters const double B = 0.000234125; const double C = 0.0000000876741; int tolerance = 2; int currentValueSet = 1; int currentValue; int difference = 1; int displayedValue; float currentTemperatureValue = 0; //int subtractingFactorForCompensation = 42; // For nodemcu int subtractingFactorForCompensation = 10; // For custom design, resistors 3003 6803 ESP8266WebServer server(80); /* Just a little test message. Go to http://192.168.4.1 in a web browser connected to this access point to see it. */ const char HTML_HOME[] PROGMEM = R"=====( ESP WEB RADIO

Temperature monitoring

Current temperature

℃
)====="; void handleRoot() { server.send(200, "text/html", HTML_HOME); } void convertDataToJson() { /* double Vout, Rth, temperature, adc_value; float returnTempRounded; adc_value = analogRead(A0); if(abs(adc_value - displayedValue) > difference) { //displayedValue = adc_value; //Serial.println("Hello world"); if(adc_value > displayedValue) { displayedValue++; } else if(adc_value < displayedValue) { displayedValue--; } } Vout = (displayedValue * VCC) / adc_resolution; Rth = (VCC * R2 / Vout) - R2; temperature = (1 / (A + (B * log(Rth)) + (C * pow((log(Rth)),3)))); // Temperature in kelvin temperature = temperature - 273.15; // Temperature in degree celsius returnTempRounded = ((float )((int)(temperature * 10))) / 10; */ server.send(200, "text/plain", String(currentTemperatureValue)); //Serial.println(returnTempRounded); } void setup() { delay(1000); Serial.begin(115200); Serial.println(); Serial.print("Configuring access point..."); /* You can remove the password parameter if you want the AP to be open. */ WiFi.softAP(ssid, password); IPAddress myIP = WiFi.softAPIP(); Serial.print("AP IP address: "); Serial.println(myIP); server.on("/", handleRoot); server.on("/convertDataToJson", convertDataToJson); server.begin(); Serial.println("HTTP server started"); displayedValue = analogRead(A0) - subtractingFactorForCompensation; } void loop() { int i=0; for(i=0;i difference) { //displayedValue = adc_value; //Serial.println("Hello world"); if(adc_value > displayedValue) { displayedValue++; } else if(adc_value < displayedValue) { displayedValue--; } } Vout = (displayedValue * VCC) / adc_resolution; Rth = (VCC * R2 / Vout) - R2; /* Steinhart-Hart Thermistor Equation: * Temperature in Kelvin = 1 / (A + B[ln(R)] + C[ln(R)]^3) * where A = 0.001129148, B = 0.000234125 and C = 8.76741*10^-8 */ temperature = (1 / (A + (B * log(Rth)) + (C * pow((log(Rth)),3)))); // Temperature in kelvin temperature = temperature - 273.15; // Temperature in degree celsius returnTempRounded = ((float )((int)(temperature * 10))) / 10; currentTemperatureValue = returnTempRounded; //currentTemperatureValue = adc_value; //server.send(200, "text/plain", String(returnTempRounded)); Serial.println(currentTemperatureValue); } }