First init.

Arduino_ls1tech_raw_modify_pulse_generator_serial/Arduino_ls1tech_raw_modify_pulse_generator_serial.ino

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+// This a test program, no warranties are implied or given. fanControllerR2V3base
+// Use, copy any modify this test program any way you want, at your own risk.
+// Test, test, test and then test some more..
+// It reads a temperature sensor and controls a Mazda PWM fan power module.
+// ...Carl...
+#include <OneWire.h>
+#include <DallasTemperature.h>
+/*----------------------- User adjustable variables and preferences section ---------------------------------*/
+float tempForFanStartup = 82.0; // 175 target low temp. below this temperature, the fan will be off
+float tempForFanOnFull = 105.0; // 210 target High temp. above this temperature, the fan will be on at full power
+// adjust these two to get the desired range. for example for a transmission, maybe 140 to 160
+
+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.
+/*----------------------- end of User adjustable variables and preferences -----------------------------------*/
+
+const int fanPwmOutPin = 12; // Arduino forces this pin to 0 or 5 volts.
+const int tempSensorPin = 7; // Pin to read analog voltage from the temp sensor.
+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 F is stored here
+float fanSpeedPct;
+
+OneWire oneWire1 (tempSensorPin);
+DallasTemperature sensorClt1(&oneWire1);
+
+void setup() { /* ++++++++++++++++++ Setup is run once when the arduino boots ++++++++++++++++++++++++++*/
+Serial.begin(115200); // set up serial port for 115200 baud (optional)
+sensorClt1.begin();
+
+sensorClt1.requestTemperatures();
+currTemperature = sensorClt1.getTempCByIndex(0);
+
+//analogReference (EXTERNAL) ; // note, this is using the 3.3 volt supply as the analog reference.
+//analogRead (tempSensorPin) ; // a couple of reads to give the A/D time to adjust
+//analogRead (tempSensorPin) ; // a couple of reads to give the A/D time to adjust
+//analogWrite(fanPwmOutPin, 0); // turn the fan off at start
+
+pwmMinStartupDuty = (voltsForFanStartup / 5.0) * 255.0; // convert the Mazda starting voltage to a PWM duty
+} // end setup
+
+
+void loop() { /* ++++++++++++++++++ Main Loop, continuously loops forever ++++++++++++++++++++++++++++*/
+
+readAndTranslateTempSensor();
+
+calculate_and_send_PWM();
+
+//print_to_serial_port(); // un-comment this line for testing and calibration to the laptop.
+
+print_to_signal_generator_softserial();
+
+} // end main loop
+
+
+void calculate_and_send_PWM() { /* ++++++++ subroutine to calculate and set PWM duty cycle ++++++++++++++*/
+
+if (currTemperature < tempForFanStartup) { // If the temperature is below the lowest setpoint, turn fan off
+analogWrite(fanPwmOutPin, 0); // PWM duty = 0 percent
+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
+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
+
+fanSpeedPct = map(pwmDuty, 0, 255, 0, 100);
+
+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
+
+} // end calculate_and_send_PWM
+
+
+void readAndTranslateTempSensor() { /* ++++++ subroutine to read and translate temp sensor to temp F +++++++++++++*/
+
+sensorClt1.requestTemperatures();
+currTemperature = sensorClt1.getTempCByIndex(0);
+} // end readAndTranslateTempSensor
+
+
+void print_to_serial_port() { /* ++++++++++ optional prints values to laptop usb port for debugging and calibration ++*/
+Serial.print(F("currTemperature C: ")); Serial.print(currTemperature);
+Serial.print(F(" pwmDuty: ")); Serial.println(pwmDuty);
+Serial.print(F("Percentage: ")); Serial.println((int)fanSpeedPct);
+}
+
+void print_to_signal_generator_softserial() {
+  // Check the length of fanSpeedPct
+  if (fanSpeedPct < 10) {
+    Serial.print(F("D00")); // Add "D00" prefix for single-digit fan speed
+  } else if (fanSpeedPct < 100) {
+    Serial.print(F("D0")); // Add "D0" prefix for double-digit fan speed
+  } else {
+    Serial.print(F("D")); // Add "D" prefix for triple-digit fan speed
+  }
+  
+  Serial.print((int)fanSpeedPct); // Cast fanSpeedPct to int to remove decimals
+}