base function

src/main.cpp

@@ -8,6 +8,16 @@
 /*[const]*/
 #define HEAT_OFF -300
 
+/*[pin]*/
+#define HEAT_GUN_FAN_PIN D2
+#define HEATER1_PIN D4
+#define HEATER2_PIN D4
+#define CONNECTION_LED_PIN D0
+#define HEATER1_LED_PIN D0
+#define HEATER2_LED_PIN D0
+#define HEATER1_THERMISTOR_PIN A0
+#define HEATER2_THERMISTOR_PIN A0
+
 /*[wifi]*/
 #define AP_SSID "test"
 #define AP_PASSWD "sonofussr"
@@ -24,6 +34,7 @@ AsyncWebServer server(80);
 AsyncWebSocket ws("/ws");
 
 Ticker temp_reporter;
+Ticker heater;
 
 
 /*===== Variable =====*/
@@ -35,6 +46,50 @@ double temp2_current = 0;
 double temp2_target = HEAT_OFF;
 
 
+/*===== Function =====*/
+
+double getTemperature(uint8_t thermistor_pin){
+  // vin ---- Rs --(adc)-- Rtm ---- gnd 
+  const double Vin = 3.3; //3.3 for ESP/STM32 series
+  const double Rs = 10000; //strip resistor resistance
+  const double Rtm_std = 100000; //thermistor resistance at 25C
+  const uint32_t adc_resolution = 1023; //10bit ADC
+  const uint32_t B = 3950;
+
+  const double C1 = 1/298.15;
+
+  // Vtm(Vadc) = Vin * Rtm/(Rs+Rtm)
+  // Rtm = Vtm * Rs / (Vin - Vtm)
+
+  // Rtm = Rtm_std * exp(B*(1/Tk - 1/298.15))
+  // Rtm = Rtm_std * exp(B*(1/Tk - C1))
+
+  // exp(B*(1/Tk - C1)) = Rtm / Rtm_std
+  // B*(1/Tk - C1) = log[Rtm / Rtm_std]
+  // 1/Tk = log[Rtm / Rtm_std] / B + C1
+  // Tk = 1/( log[Rtm / Rtm_std] / B + C1 )
+
+  // T = Tk -273.15;
+
+  double Vtm = (analogRead(thermistor_pin) * Vin) / adc_resolution;
+  double Rtm = Vtm * Rs / (Vin - Vtm);
+  double T = 1 / ( log(Rtm / Rtm_std) / B + C1) - 273.15;
+
+  return T;
+}
+
+
+void heat_drive(uint8_t heater, bool heat_sw){
+  if(heater == 1){
+    digitalWrite(HEATER1_PIN, heat_sw);
+    digitalWrite(HEATER1_LED_PIN, !heat_sw); //low: turn on
+  }else if(heater == 2){
+    digitalWrite(HEATER2_PIN, heat_sw);
+    digitalWrite(HEATER2_LED_PIN, !heat_sw); //low: turn on
+  }
+}
+
+
 /*===== Handler =====*/
 
 void handleWebSocketMessage(void *arg, uint8_t *data, size_t len) {
@@ -95,11 +150,38 @@ void temp_report_handler(){
 }
 
 
+void heat_handler(){
+  temp1_current = getTemperature(HEATER1_THERMISTOR_PIN);
+  temp2_current = getTemperature(HEATER2_THERMISTOR_PIN);
+
+  if(temp1_target > MAX_TEMP || temp1_target < 0 || temp1_current > temp1_target){
+    heat_drive(1,0);
+  }else{
+    heat_drive(1,1);
+  }
+
+  if(temp2_target > MAX_TEMP || temp2_target < 0 || temp2_current > temp2_target){
+    heat_drive(2,0);
+  }else{
+    heat_drive(2,1);
+  }
+}
+
+
 /*===== Main =====*/
 
 void setup() {
   Serial.begin(115200);
 
+  //pin init
+  pinMode(HEAT_GUN_FAN_PIN, OUTPUT);
+  pinMode(HEATER1_PIN, OUTPUT);
+  pinMode(HEATER2_PIN, OUTPUT);
+  pinMode(CONNECTION_LED_PIN, OUTPUT);
+  pinMode(HEATER1_LED_PIN, OUTPUT);
+  pinMode(HEATER2_LED_PIN, OUTPUT);
+
+
   //init LittleFS
   if(!LittleFS.begin()){
     Serial.println("fail init fs");
@@ -129,7 +211,9 @@ void setup() {
 
   server.begin();
 
+  //ticker
   temp_reporter.attach(0.5, temp_report_handler);
+  heater.attach(0.1, heat_handler);
 }
 
 void loop() {