ALIGN_Temperature_Sensor.ino

// Orion temperature canbus: https://www.orionbms.com/downloads/misc/thermistor_module_canbus.pdf
// Orion temperature third-party: https://www.orionbms.com/manuals/pdf/third_party_thermistors.pdf

#include <SPI.h>
#include <mcp2515.h>

struct can_frame tempCanMessage; // To send for one peace of data. Can be duplicated for other ID's and data
MCP2515 mcp2515(10);             // Chip select

tempCanMessage.can_id = 0x1839F380; // CANBUS ID
tempCanMessage.can_dlc = 8;         // Length of the message
//---CAN DATA START --- //
tempCanMessage.data[0] = 0x00; // Thermistor Module Number
tempCanMessage.data[1] = 0x00; // Lowest thermistor value (8 bit signed, 1*C increments)
tempCanMessage.data[2] = 0x00; // Highest thermistor value (8 bit signed, 1*C increments)
tempCanMessage.data[3] = 0x00; // Average thermistor value (8 bit signed, 1*C increments)
tempCanMessage.data[4] = 0x00; // Number of thermistors enabled
tempCanMessage.data[5] = 0x00; // Highest thermistor ID on the module
tempCanMessage.data[6] = 0x00; // Lowest thermistor ID on the module
tempCanMessage.data[7] = 0x00; // Checksum 8-bytes sum of all bytes + ID + length
//---CAN DATA END --- //

while (!Serial)
{
  Serial.begin(9600);
}
SPI.begin();

mcp2515.reset();
mcp2515.setBitrate(CAN_500KBPS); // Rate of CANBUS 500kbps for normal usage
mcp2515.setNormalMode();

// Temperature Sensor for Battery Management System
// For "Li-ion building block Li4P25RT"

const int sg1 = A0;
const int light = 13;
const int fan = 0;    // fan speed
const int outFan = 3; // Pin out for fan PWM
float volt[33] = {2.44, 2.42, 2.40, 2.38, 2.35, 2.32, 2.27, 2.23, 2.17, 2.11, 2.05, 1.99, 1.86, 1.80, 1.74, 1.68,
                  1.63, 1.59, 1.55, 1.51, 1.48, 1.45, 1.43, 1.40, 1.38, 1.37, 1.35, 1.34, 1.33, 1.32, 1.31, 1.30};
float temp[33] = {-40, -35, -30, -25, -20, -15, -10, -5, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120};

int diff[33] = {};
int index = 0;

float sensor1 = 0;
float temperature = 0; // temperature

void setup()
{
  Serial.begin(9600);
  Serial.println("Startup");
  pinMode(light, OUTPUT);
}
unsigned long tempSendTime;
void loop()
{

  sensor1 = (analogRead(sg1));

  for (int j = 0; j <= 32; j++)
  {
    diff[j] = abs((volt[j]) * 1023 / 5 - sensor1);
  }

  for (int i = 0; i <= 32; i++)
  {
    if (diff[i] <= diff[index])
    {
      index = i;
    }
  }

  temperature = temp[index];

  Serial.print("Temperature 1: ");
  Serial.print(temperature);
  Serial.print(" Voltage 1: ");
  Serial.println(sensor1 * 5 / 1023);

  if (temperature < 25)
  {
    fan = 0;
  }
  else if (temperature >= 25 || temperature < 30)
  {
    fan = 255 * (1 / 4);
  }
  else if (temperature >= 30 || temperature < 35)
  {
    fan = 255 * (2 / 4);
  }
  else if (temperature >= 35 || temperature < 40)
  {
    fan = 255 * (3 / 4);
  }
  else
  {
    fan = 255;
  }

  if (temperature >= 50)
  {
    digitalWrite(light, HIGH);
  }
  else
  {
    digitalWrite(light, LOW);
  }
  if (millis() - tempSendTime > 100)
    mcp2515.sendMessage(&tempCanMessage);
}