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| #include <TimerOne.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
// A0 - Voltage divider (solar)
// A1 - ACS 712 Out
// A2 - Voltage divider (battery)
// A4 - LCD SDA
// A5 - LCD SCL
// D5 - LCD back control button
// D6 - Load Control
// D8 - 2104 MOSFET driver SD
// D9 - 2104 MOSFET driver IN
// D11- Green LED
// D12- Blue LED
// D13- Red LED
#define LOAD_ALGORITHM 0
#define SOL_VOLTS_CHAN 0
#define BAT_VOLTS_CHAN 1
#define SOL_AMPS_CHAN 2
#define AVG_NUM 8
#define SOL_VOLTS_SCALE 0.024900275
#define BAT_VOLTS_SCALE 0.024926075
#define SOL_AMPS_SCALE 0.024506081
#define PWM_PIN 9
#define PWM_ENABLE_PIN 8
#define PWM_FULL 1023
#define PWM_MAX 100
#define PWM_MIN 60
#define PWM_START 90
#define PWM_INC 1
#define TRUE 1
#define FALSE 0
#define ON TRUE
#define OFF FALSE
#define TURN_ON_MOSFETS digitalWrite(PWM_ENABLE_PIN, HIGH)
#define TURN_OFF_MOSFETS digitalWrite(PWM_ENABLE_PIN, LOW)
#define ONE_SECOND 50000
#define LOW_SOL_WATTS 5.00
#define MIN_SOL_WATTS 1.00
#define MIN_BAT_VOLTS 11.00
#define MAX_BAT_VOLTS 14.10
#define BATT_FLOAT 13.60
#define HIGH_BAT_VOLTS 13.00
#define LVD 11.5
#define OFF_NUM 9
#define LED_GREEN 11
#define LED_BLUE 12
#define LED_RED 13
#define LOAD_PIN 6
#define BACK_LIGHT_PIN 5
byte battery_icons[6][8]=
{{
0b01110,
0b11011,
0b10001,
0b10001,
0b10001,
0b10001,
0b11111,
0b00000,
},
{
0b01110,
0b11011,
0b10001,
0b10001,
0b10001,
0b11111,
0b11111,
0b00000,
},
{
0b01110,
0b11011,
0b10001,
0b10001,
0b11111,
0b11111,
0b11111,
0b00000,
},
{
0b01110,
0b11011,
0b11111,
0b11111,
0b11111,
0b11111,
0b11111,
0b00000,
},
{
0b01110,
0b11111,
0b11111,
0b11111,
0b11111,
0b11111,
0b11111,
0b00000,
},
{
0b01110,
0b11111,
0b11111,
0b11111,
0b11111,
0b11111,
0b11111,
0b00000,
}};
#define SOLAR_ICON 6
byte solar_icon[8] =
{
0b11111,
0b10101,
0b11111,
0b10101,
0b11111,
0b10101,
0b11111,
0b00000
};
#define PWM_ICON 7
byte _PWM_icon[8]=
{
0b11101,
0b10101,
0b10101,
0b10101,
0b10101,
0b10101,
0b10111,
0b00000,
};
byte backslash_char[8]=
{
0b10000,
0b10000,
0b01000,
0b01000,
0b00100,
0b00100,
0b00010,
0b00000,
};
float sol_amps;
float sol_volts;
float bat_volts;
float sol_watts;
float old_sol_watts = 0;
unsigned int seconds = 0;
unsigned int prev_seconds = 0;
unsigned int interrupt_counter = 0;
unsigned long time = 0;
int delta = PWM_INC;
int pwm = 0;
int back_light_pin_State = 0;
boolean load_status = false;
enum charger_mode {off, on, bulk, bat_float} charger_state;
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
void setup()
{
pinMode(PWM_ENABLE_PIN, OUTPUT);
TURN_OFF_MOSFETS;
charger_state = off;
lcd.begin(20,4);
lcd.backlight();
for (int batchar = 0; batchar < 6; ++batchar)
{
lcd.createChar(batchar, battery_icons[batchar]);
}
lcd.createChar(PWM_ICON,_PWM_icon);
lcd.createChar(SOLAR_ICON,solar_icon);
lcd.createChar('\\', backslash_char);
pinMode(LED_RED, OUTPUT);
pinMode(LED_GREEN, OUTPUT);
pinMode(LED_BLUE, OUTPUT);
Timer1.initialize(20);
Timer1.pwm(PWM_PIN, 0);
Timer1.attachInterrupt(callback);
Serial.begin(9600);
pwm = PWM_START;
pinMode(BACK_LIGHT_PIN, INPUT);
pinMode(LOAD_PIN,OUTPUT);
digitalWrite(LOAD_PIN,LOW);
digitalWrite(BACK_LIGHT_PIN,LOW);
lcd.setCursor(0, 0);
lcd.print("SOL");
lcd.setCursor(4, 0);
lcd.write(SOLAR_ICON);
lcd.setCursor(8, 0);
lcd.print("BAT");
}
void loop()
{
read_data();
run_charger();
// print_data();
load_control();
led_output();
lcd_display();
}
int read_adc(int channel)
{
int sum = 0;
int temp;
int i;
for (i=0; i<AVG_NUM; i++) { temp = analogRead(channel); sum += temp; delayMicroseconds(50); } return(sum / AVG_NUM); } void read_data(void) { sol_amps = (read_adc(SOL_AMPS_CHAN) * SOL_AMPS_SCALE -13.51); sol_volts = read_adc(SOL_VOLTS_CHAN) * SOL_VOLTS_SCALE; bat_volts = read_adc(BAT_VOLTS_CHAN) * BAT_VOLTS_SCALE; sol_watts = sol_amps * sol_volts ; } void callback() { if (interrupt_counter++ > ONE_SECOND)
{
interrupt_counter = 0;
seconds++;
}
}
void set_pwm_duty(void)
{
if (pwm > PWM_MAX)
{
pwm = PWM_MAX;
}
else if (pwm < PWM_MIN)
{
pwm = PWM_MIN;
}
if (pwm < PWM_MAX)
{
Timer1.pwm(PWM_PIN,(PWM_FULL * (long)pwm / 100), 20);
}
else if (pwm == PWM_MAX)
{
Timer1.pwm(PWM_PIN,(PWM_FULL - 1), 20);
}
}
void run_charger(void)
{
static int off_count = OFF_NUM;
switch (charger_state)
{
case on:
if (sol_watts < MIN_SOL_WATTS) { charger_state = off; off_count = OFF_NUM; TURN_OFF_MOSFETS; } else if (bat_volts > (BATT_FLOAT - 0.1))
{
charger_state = bat_float;
}
else if (sol_watts < LOW_SOL_WATTS)
{
pwm = PWM_MAX;
set_pwm_duty();
}
else
{
pwm = ((bat_volts * 10) / (sol_volts / 10)) + 5;
charger_state = bulk;
}
break;
case bulk:
if (sol_watts < MIN_SOL_WATTS) { charger_state = off; off_count = OFF_NUM; TURN_OFF_MOSFETS; } else if (bat_volts > BATT_FLOAT)
{
charger_state = bat_float;
}
else if (sol_watts < LOW_SOL_WATTS) { charger_state = on; TURN_ON_MOSFETS; } else { if (old_sol_watts >= sol_watts)
{
delta = -delta;
}
pwm += delta;
old_sol_watts = sol_watts;
set_pwm_duty();
}
break;
case bat_float:
if (sol_watts < MIN_SOL_WATTS) { charger_state = off; off_count = OFF_NUM; TURN_OFF_MOSFETS; set_pwm_duty(); } else if (bat_volts > BATT_FLOAT)
{
TURN_OFF_MOSFETS;
pwm = PWM_MAX;
set_pwm_duty();
}
else if (bat_volts < BATT_FLOAT)
{
pwm = PWM_MAX;
set_pwm_duty();
TURN_ON_MOSFETS;
if (bat_volts < (BATT_FLOAT - 0.1)) { charger_state = bulk; } } break; case off: TURN_OFF_MOSFETS; if (off_count > 0)
{
off_count--;
}
else if ((bat_volts > BATT_FLOAT) && (sol_volts > bat_volts))
{
charger_state = bat_float;
TURN_ON_MOSFETS;
}
else if ((bat_volts > MIN_BAT_VOLTS) && (bat_volts < BATT_FLOAT) && (sol_volts > bat_volts))
{
charger_state = bulk;
TURN_ON_MOSFETS;
}
break;
default:
TURN_OFF_MOSFETS;
break;
}
}
void load_control()
{
#if LOAD_ALGORITHM == 0
load_on(sol_watts < MIN_SOL_WATTS && bat_volts > LVD);
#else
load_on(sol_watts > MIN_SOL_WATTS && bat_volts > BATT_FLOAT);
#endif
}
void load_on(boolean new_status)
{
if (load_status != new_status)
{
load_status = new_status;
digitalWrite(LOAD_PIN, new_status ? HIGH : LOW);
}
}
void print_data(void) // you can skip this part)
{
Serial.print(seconds,DEC);
Serial.print(" ");
Serial.print("Charging = ");
if (charger_state == on) Serial.print("on ");
else if (charger_state == off) Serial.print("off ");
else if (charger_state == bulk) Serial.print("bulk ");
else if (charger_state == bat_float) Serial.print("float");
Serial.print(" ");
Serial.print("pwm = ");
if(charger_state == off)
Serial.print(0,DEC);
else
Serial.print(pwm,DEC);
Serial.print(" ");
Serial.print("Current (panel) = ");
Serial.print(sol_amps);
Serial.print(" ");
Serial.print("Voltage (panel) = ");
Serial.print(sol_volts);
Serial.print(" ");
Serial.print("Power (panel) = ");
Serial.print(sol_volts);
Serial.print(" ");
Serial.print("Battery Voltage = ");
Serial.print(bat_volts);
Serial.print(" ");
Serial.print("\n\r");
//delay(1000);
}
void light_led(char pin)
{
static char last_lit;
if (last_lit == pin)
return;
if (last_lit != 0)
digitalWrite(last_lit, HIGH);
digitalWrite(pin, LOW);
last_lit = pin;
}
void led_output(void)
{
static char last_lit;
if(bat_volts > 14.1 )
light_led(LED_BLUE);
else if(bat_volts > 11.9)
light_led(LED_GREEN);
else
light_led(LED_RED);
}
void lcd_display()
{
static bool current_backlight_state = -1;
back_light_pin_State = digitalRead(BACK_LIGHT_PIN);
if (current_backlight_state != back_light_pin_State)
{
current_backlight_state = back_light_pin_State;
if (back_light_pin_State == HIGH)
lcd.backlight();
else
lcd.noBacklight();
}
if (back_light_pin_State == HIGH)
{
time = millis();
}
lcd.setCursor(0, 1);
lcd.print(sol_volts);
lcd.print("V ");
lcd.setCursor(0, 2);
lcd.print(sol_amps);
lcd.print("A");
lcd.setCursor(0, 3);
lcd.print(sol_watts);
lcd.print("W ");
lcd.setCursor(8, 1);
lcd.print(bat_volts);
lcd.setCursor(8,2);
if (charger_state == on)
lcd.print("on ");
else if (charger_state == off)
lcd.print("off ");
else if (charger_state == bulk)
lcd.print("bulk ");
else if (charger_state == bat_float)
{
lcd.print(" ");
lcd.setCursor(8,2);
lcd.print("float");
}
int pct = 100.0*(bat_volts - 11.3)/(12.7 - 11.3);
if (pct < 0) pct = 0; else if (pct > 100)
pct = 100;
lcd.setCursor(12,0);
lcd.print((char)(pct*5/100));
lcd.setCursor(8,3);
pct = pct - (pct%10);
lcd.print(pct);
lcd.print("% ");
lcd.setCursor(15,0);
lcd.print("PWM");
lcd.setCursor(19,0);
lcd.write(PWM_ICON);
lcd.setCursor(15,1);
lcd.print(" ");
lcd.setCursor(15,1);
if( charger_state == off)
lcd.print(0);
else
lcd.print(pwm);
lcd.print("% ");
lcd.setCursor(15,2);
lcd.print("Load");
lcd.setCursor(15,3);
if (load_status)
{
lcd.print("On ");
}
else
{
lcd.print("Off ");
}
spinner();
backLight_timer();
}
void backLight_timer()
{
if((millis() - time) <= 15000)
lcd.backlight();
else
lcd.noBacklight();
}
void spinner(void)
{
static int cspinner;
static char spinner_chars[] = { '*','*', '*', ' ', ' '};
cspinner++;
lcd.print(spinner_chars[cspinner%sizeof(spinner_chars)]);
} |
