First init.

Wemos_LS1Tech_MOSFET_Directly_1.0/Wemos_LS1Tech_MOSFET_Directly_1.0.ino

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+#include <OneWire.h>
+#include <DallasTemperature.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SH110X.h>
+
+#define i2c_Address 0x3C // OLED Adress.
+#define SCREEN_WIDTH 128
+#define SCREEN_HEIGHT 64
+#define OLED_RESET -1
+
+Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
+
+float tempForFanStartup = 22.0; // 82c/175.0F target low temp. below this temperature, the fan will be off
+float tempForFanOnFull = 31.0; // 105c/210.0F target High temp. above this temperature, the fan will be on at full power
+float tempForIdiotLight = 26.0; //115c
+
+float voltsForFanStartup = 2.0; // Roughly the signal voltage that triggers the mazda module's slowest speed.
+// A higher voltage here will effectively increase the fans lowest speed target.
+
+const int fanPwmOutPin = 6; // Arduino forces this pin to 0 or 5 volts.
+const int idiotLightPin = 8;
+const int tempSensorPin = 7; // Pin to read from the DS1820 temp sensor.
+const int temp2SensorPin = 9;
+const int LEDpin = 15;
+int pwmDuty; // The calculated PWM duty is stored here
+float pwmMinStartupDuty; // the starting duty is stored here (mazda module starts fans at about 24 % duty)
+float currTemperature; // the temperature in C is stored here
+float curr2Temperature; // redundant temp sensor in C stored here
+float idiotLight;
+
+OneWire oneWire1 (tempSensorPin);
+DallasTemperature sensorClt1(&oneWire1);
+OneWire oneWire2 (temp2SensorPin);
+DallasTemperature sensorClt2(&oneWire2);
+
+void setup() {
+Serial.begin(115200); // set up serial port for 115200 baud (optional)
+sensorClt1.begin();
+sensorClt2.begin();
+sensorClt1.requestTemperatures();
+currTemperature = sensorClt1.getTempCByIndex(0);
+sensorClt2.requestTemperatures();
+curr2Temperature = sensorClt2.getTempCByIndex(0);
+//pinMode(tempSensorPin, INPUT);
+//pinMode(temp2SensorPin, INPUT);
+
+pinMode(LEDpin, OUTPUT);
+//analogWrite(fanPwmOutPin, 0); // turn the fan off at start
+digitalWrite(idiotLightPin, LOW);
+idiotLight = LOW;
+
+ledcSetup(0, 20000, 8);
+ledcAttachPin(fanPwmOutPin, 0);
+
+ledcWrite(0, 0);
+
+  if (!display.begin(i2c_Address)) {
+    Serial.println(F("SH110X allocation failed"));
+    for (;;);
+  }
+
+pwmMinStartupDuty = (voltsForFanStartup / 5.0) * 255.0; // convert the Mazda starting voltage to a PWM duty
+}
+
+void loop() {
+  readAndTranslateTempSensor();
+  calculate_and_send_PWM();
+  idiotLightAlarm();
+  displayOutput();
+  LEDblink();
+  //print_to_serial_port();
+  delay(20);
+}
+
+void calculate_and_send_PWM() {
+if (currTemperature < tempForFanStartup) { // If the temperature is below the lowest setpoint, turn fan off
+//analogWrite(fanPwmOutPin, 0); // PWM duty = 0 percent
+ledcWrite(0, 0);
+pwmDuty = 0;
+return;
+}
+if (currTemperature > tempForFanOnFull) { // If the temperature is above the highest setpoint, turn fan on full
+//analogWrite(fanPwmOutPin, 255); // PWM duty = 100 percent
+ledcWrite(0, 255);
+pwmDuty = 255;
+return;
+}
+
+float tempRange = tempForFanOnFull - tempForFanStartup ; // start calculating duty cycle
+float pwmRange = 255.0 - pwmMinStartupDuty ;
+float pwmDutyPct = (currTemperature - tempForFanStartup) / tempRange ;
+
+pwmDuty = (int) (pwmMinStartupDuty + (pwmDutyPct * pwmRange) +.5); // actual PWM duty is calculated here
+
+if (pwmDuty > 255) { // make sure duty ended up between 255 and 0
+pwmDuty = 255;
+}
+if (pwmDuty < 0) {
+pwmDuty = 0;
+}
+
+//analogWrite(fanPwmOutPin, pwmDuty); // write PWM duty to PWM output pin
+ledcWrite(0, pwmDuty);
+}
+
+void readAndTranslateTempSensor() {
+//float currTemperature;
+sensorClt1.requestTemperatures();
+currTemperature = sensorClt1.getTempCByIndex(0);
+
+sensorClt2.requestTemperatures();
+curr2Temperature = sensorClt2.getTempCByIndex(0);
+}
+
+void displayOutput() {
+  display.clearDisplay();
+
+  display.setTextSize(1);
+  display.setTextColor(SH110X_WHITE);
+
+// Display temperature on the screen in Celsius with one decimal place
+  display.setCursor(10, 10);
+  display.print("Temp:");
+  display.setCursor(40, 10);
+  display.print(currTemperature, 2); // Display one decimal place
+  display.setCursor(80, 10);
+  display.print("/ ");
+  display.print(curr2Temperature, 2);
+
+  display.setCursor(10, 20);
+  display.print("PWMd:");
+  display.setCursor(40, 20);
+  display.print(pwmDuty);
+
+  display.setCursor(10, 30);
+  display.print("Lamp:");
+  display.setCursor(40, 30);
+  display.print(idiotLight, 0);
+
+  // Update the display
+  display.display();
+}
+
+void idiotLightAlarm() {
+  if (currTemperature > tempForIdiotLight) {
+    digitalWrite(idiotLightPin, HIGH);
+    idiotLight = HIGH;
+  }
+    else if (currTemperature < tempForIdiotLight) {
+    digitalWrite(idiotLightPin, LOW);
+    idiotLight = LOW;
+  }
+}
+
+void LEDblink() {
+  digitalWrite(LEDpin, HIGH);
+  delay(1000);
+  digitalWrite(LEDpin, LOW);
+  delay(1000);
+}
+
+void print_to_serial_port() {
+Serial.print(F("currTemperature C: ")); Serial.print(currTemperature);
+Serial.print(F(" pwmDuty: ")); Serial.println(pwmDuty);
+}