README.md

@@ -3,31 +3,8 @@
 A tiny tank cooler.
 
 Used components:
-----------------
 
-Arduino nano (old bootloader)
+Arduino nano
 PC fan 120mm 5V
 PWM D4184 MOS breakout board
 USB-C connector
-
-Connections:
-------------
-
-USB-C D+ <-> Pin4 CH430 chip
-USB-C D- <-> Pin5 CH430 chip
-
-VIN      <-> PWM board (+)
-VIN      <-> USB-C V+
-
-GND      <-> USB-C GND
-GND      <-> BMP280 breakout board GND
-GND      <-> PWM breakout board GND
-
-D9       <-> PWM Pin of the breakout board
-
-A4       <-> SCL pin of BMP280 breakout board
-A5       <-> SDA pin of BMP280 breakout board
-
-PWM board load <-> PC fan (+)
-PWM board GNC  <-> PC fan (-)
-

firmware/firmware.ino

@@ -1,73 +0,0 @@
-
-#define FAN_PIN    9 // D9
-#define L_LED_PIN 13 // D13
-
-#define BMP280_I2C_ADDRESS 0x76  // BMP280 conneciton: D1 = SCL; D2 = SDA
-
-// minimum value to start both fan's is 110
-// without queeking noise is 255
-#define FAN_ON_TEMP      26.0
-#define FAN_OFF_MAX_TEMP 25.0
-
-#define FAN_ON_STATE  HIGH
-#define FAN_OFF_STATE  LOW
-
-#define BMP280_CHECK_INTERVAL_MS 2000 // every 60000 = 60 seconds
-
-float bmp280_temp = -99.9;
-uint32_t bmp280_lastcheck_millis = BMP280_CHECK_INTERVAL_MS;
-
-uint8_t fan_state = LOW;
-
-float sensor_bmp280_temperature();
-
-void setup()
-{
-  // put your setup code here, to run once:
-
-  // setup serial
-  Serial.begin(115200);
-  Serial.println();
-  delay(1000);
-
-  // setup BMP280
-  Serial.println("Sensor BMP280 init status: " + String(sensor_bmp280_begin(BMP280_I2C_ADDRESS)));
-  bmp280_temp = sensor_bmp280_temperature();
-
-  // setup FAN Pin
-  pinMode(FAN_PIN, OUTPUT);
-
-  pinMode(L_LED_PIN, OUTPUT);
-}
-
-void loop()
-{
-  // put your main code here, to run repeatedly:
-
-  if ((bmp280_lastcheck_millis + BMP280_CHECK_INTERVAL_MS) <= millis())
-  {
-    bmp280_temp = sensor_bmp280_temperature();
-    Serial.println("Temperature: " + String(bmp280_temp) + "°C");
-    digitalWrite(L_LED_PIN, HIGH);
-
-    if (fan_state > 0 && bmp280_temp <= FAN_OFF_MAX_TEMP)
-    {
-      fan_state = FAN_OFF_STATE;  // off
-    }
-
-    if (bmp280_temp >= FAN_ON_TEMP)
-    {
-      fan_state = FAN_ON_STATE;
-    }
-
-    Serial.println("FAN state: " + String(fan_state));
-
-    digitalWrite(FAN_PIN, fan_state);
-
-    digitalWrite(L_LED_PIN, LOW);
-
-    bmp280_lastcheck_millis = millis();
-  }
-
-}
-

firmware/sensor_bmp280.ino

@@ -1,39 +0,0 @@
-
-#include <Adafruit_BMP280.h>  // Install from library manager - sensor board info: https://www.bastelgarage.ch/bmp280-temperatur-luftdruck-sensor
-
-Adafruit_BMP280 _sensor_bmp280;
-Adafruit_Sensor *_sensor_bmp280_temp = _sensor_bmp280.getTemperatureSensor();
-Adafruit_Sensor *_sensor_bmp280_pressure = _sensor_bmp280.getPressureSensor();
-
-#define BPM280_TEMP_FACTOR 1.0
-
-bool sensor_bmp280_begin(uint8_t addr) {
-  bool status = _sensor_bmp280.begin(addr);
-
-  if (status) {
-    Serial.println("BMP280 Connected");
-
-    _sensor_bmp280.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
-                               Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
-                               Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
-                               Adafruit_BMP280::FILTER_X16,      /* Filtering. */
-                               Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
-
-  } else {
-    Serial.println("Could not find a valid BMP280 sensor, check wiring or try a different address!");
-    Serial.println("SensorID was: " + String(_sensor_bmp280.sensorID()));
-    Serial.println("  ID of 0xFF probably means a bad address, a BMP180 or BMP085");
-    Serial.println("  ID of 0x56-0x58 represents a BMP280,");
-    Serial.println("  ID of 0x60 represents a BME280,");
-    Serial.println("  ID of 0x61 represents a BME680.");
-  }
-
-  return status;
-}
-
-float sensor_bmp280_temperature() {
-  sensors_event_t temp_event, pressure_event;
-  _sensor_bmp280_temp->getEvent(&temp_event);
-  return temp_event.temperature * BPM280_TEMP_FACTOR;
-}
-