69 lines
2.4 KiB
Arduino
69 lines
2.4 KiB
Arduino
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void setup() {
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Serial.begin(115200);
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}
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float getTemperature(void)
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{
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//Local variables
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float Temperature; //Corporal Temperature
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float Resistance; //Resistance of sensor.
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float ganancia=5.0;
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float Vcc=3.3;
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float RefTension=3.0; // Voltage Reference of Wheatstone bridge.
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float Ra=4700.0; //Wheatstone bridge resistance.
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float Rc=4700.0; //Wheatstone bridge resistance.
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float Rb=821.0; //Wheatstone bridge resistance.
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int sensorValue = analogRead(A3);
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float voltage2=((float)sensorValue*Vcc)/1023; // binary to voltage conversion
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// Wheatstone bridge output voltage.
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voltage2=voltage2/ganancia;
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// Resistance sensor calculate
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float aux=(voltage2/RefTension)+Rb/(Rb+Ra);
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Resistance=Rc*aux/(1-aux);
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if (Resistance >=1822.8) {
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// if temperature between 25ºC and 29.9ºC. R(tª)=6638.20457*(0.95768)^t
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Temperature=log(Resistance/6638.20457)/log(0.95768);
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} else {
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if (Resistance >=1477.1){
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// if temperature between 30ºC and 34.9ºC. R(tª)=6403.49306*(0.95883)^t
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Temperature=log(Resistance/6403.49306)/log(0.95883);
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} else {
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if (Resistance >=1204.8){
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// if temperature between 35ºC and 39.9ºC. R(tª)=6118.01620*(0.96008)^t
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Temperature=log(Resistance/6118.01620)/log(0.96008);
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}
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else{
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if (Resistance >=988.1){
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// if temperature between 40ºC and 44.9ºC. R(tª)=5859.06368*(0.96112)^t
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Temperature=log(Resistance/5859.06368)/log(0.96112);
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}
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else {
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if (Resistance >=811.7){
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// if temperature between 45ºC and 50ºC. R(tª)=5575.94572*(0.96218)^t
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Temperature=log(Resistance/5575.94572)/log(0.96218);
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}
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}
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}
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}
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}
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return Temperature;
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}
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void loop() {
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int airFlow = analogRead(A1);
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int emg = analogRead(0);
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int temp = getTemperature();
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Serial.print(airFlow);
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Serial.print(";");
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Serial.print(emg);
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Serial.print(";");
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Serial.println(temp);
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delay(100);
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}
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