
/*
  Battery simulation for Green Factory

*/

float voltage_Batt_Sol;
float voltage_Batt_Wind;
float Sol_Voltage;
float Wind_Voltage;



void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(A7, INPUT);
  pinMode(A6, INPUT);

}

void loop() {
  // We can't use bridge divider in simulation (WIP wokwi side)
  // so we cheat by giving a range of 0 to 5
  // and we tweak it by a ratio of 16/1023 (1023 bits adc, range of 0 to 16V)

  // Read ADC values
  voltage_Batt_Sol = analogRead(A6);
  voltage_Batt_Wind = analogRead(A7);

  // Calculate the "true" value 
  Sol_Voltage = ((voltage_Batt_Sol) / 1023 ) *16;
  Wind_Voltage = ((voltage_Batt_Wind) / 1023 ) *16;

  // Print of calculated values (and formatting)
  Serial.print("Solar Battery Voltage : ");
  // Serial.print(Sol_Voltage);
  Serial.print(voltage_Batt_Sol);
  Serial.print("V    |   ");
  Serial.print("Wind Battery Voltage : ");
  // Serial.print(Wind_Voltage);
  Serial.print(voltage_Batt_Wind);
  Serial.println("V");
  delay(100);
}



sketch.ino

diagram.json

// Custom Chip to emulate battery behavior
// Created for Green Factory by Vrt
// 

#include "wokwi-api.h"
#include <stdio.h>
#include <stdlib.h>


/* 
* Declares a struct named batt
* Batt_pos : pin that outputs the analog voltage
* Voltage_attr : attribute to the object, links the model and the 
*/
typedef struct {
  pin_t Batt_pos;
  float voltage_attr;
} batt;

// Declares Chip_timer_event
static void chip_timer_event(void *user_data);

// MAIN 
void chip_init(void) {

  // Memory allocation and declaration of Batt struct Batt_chip
  batt* batt_chip = malloc(sizeof(batt));

  // Init Batt_chip attributes
  batt_chip->Batt_pos = pin_init("Batt_pos", ANALOG);  
  batt_chip->voltage_attr = attr_init_float("voltage", 4.00);

/* https://docs.wokwi.com/chips-api/time
* Time simulation
* Configuration of timer, calls back a function
* And gives it the simulated custom chip as an argument
*/
  const timer_config_t timer_config = {
    .callback = chip_timer_event,
    .user_data = batt_chip,
  };


/* 
* Initialisation of the timer with previously described config
* Start the timer
* Triger it every 1ms (1000µs)
* Repeat the timer indefinetly (until an optional timer_stop(timer_id) )
*/
  timer_t timer_id = timer_init(&timer_config);
  timer_start(timer_id, 1000, true);

}

// END OF MAIN

/*
* Function called on Timer
* Reads the custom chip's voltage attribute
* Convert to analog and writes it of chip's pin Batt_pos
*/
void chip_timer_event(void *user_data) {
  batt *chip = (batt*)user_data;
  // Read attribute controlled by user to tune the battery voltage
  float voltage = attr_read_float(chip->voltage_attr);
  // Convert it to a value from 0 to 5
  voltage = voltage*(5.00/16.00);
  // Write analog value on output pin
  pin_dac_write(chip->Batt_pos, voltage);
}

