Good morning everyone, I've come across something particular that I can't solve and I need your help.
I'm using an arduino mega ADK and Python3 on my PC. I would like to have my solar system turned on remotely, I send a serial letter, Arduino detects it and performs an operation. So far so good.
Once this operation is done I would like to run another Python script that reads the system values such as, battery charge, maximum and minimum voltage and so on.
But I noticed that if my system is on and I go to read the values the Arduino program starts again as if I was recharging it again... this thing is very strange, I put some global variables that should remain saved so you can remember if the system is on or off but they erase every time you read them and start from 0 so I realized that the code is recharged every time... I put the Arduino and Python code so whoever wants to help me knows what I'm doing.... 
#include <ModbusMaster.h>
#include <SimpleDHT.h>
#define MAX485_DE 10
#define MAX485_RE_NEG 11
float MaximumInputVoltPVToday = 0;
float MinimumInputVoltPVToday = 0;
float MaximumBatteryVoltToday = 0;
float MinimumBatteryVoltToday = 0;
float ConsumedEnergyToday = 0;
float GeneratedEnergyToday = 0;
float TotalConsumed = 0;
float TotalGenerated = 0;
String StatoCascina = "Spenta";
// instantiate ModbusMaster object
ModbusMaster node;
void preTransmission()
{
digitalWrite(MAX485_RE_NEG, 1);
digitalWrite(MAX485_DE, 1);
}
void postTransmission()
{
digitalWrite(MAX485_RE_NEG, 0);
digitalWrite(MAX485_DE, 0);
}
int Switch = 3;
int pinDHT11 = 2;
SimpleDHT11 dht11(pinDHT11);
int Temp = 0;
int TempMax = 0;
int TempMin = 0;
int Umidita = 0;
int UmidMax = 0;
int Umidmin = 0;
int i = 0;
int Freddo = 10;
byte temperature = 0;
byte humidity = 0;
char Lettera = 'C';
char Dati;
int Detezione = 0;
String FreddoCaldo = "Freddo";
void setup() {
Serial.begin(9600);
pinMode(Switch, OUTPUT);
digitalWrite(Switch, HIGH);
pinMode(MAX485_RE_NEG, OUTPUT);
pinMode(MAX485_DE, OUTPUT);
// Init in receive mode
digitalWrite(MAX485_RE_NEG, 0);
digitalWrite(MAX485_DE, 0);
// Modbus communication runs at 115200 baud
Serial1.begin(115200);
Serial2.begin(9600);
// Modbus slave ID 1
node.begin(1, Serial1);
// Callbacks allow us to configure the RS485 transceiver correctly
node.preTransmission(preTransmission);
node.postTransmission(postTransmission);
}
void DatiPannello (void);
void Temperatura(void);
bool state = false;
void loop() {
uint8_t result;
uint16_t data[6];
if (Serial.available() > 0) {
Dati = Serial.read();
}
if (Dati == 'M') {
Serial.println(Detezione);
DatiPannello();
Detezione = 1;
Serial.println(Detezione);
delay(50);
}
if (Dati == 'F') {
state = true;
result = node.writeSingleCoil(0x0002, state);
delay(2000);
digitalWrite(Switch, LOW);
StatoCascina = "Accesa";
Detezione = 2;
Serial.println(Detezione);
}
if (Dati == 'L') {
digitalWrite(Switch, HIGH);
state = false;
result = node.writeSingleCoil(0x0002, state);
delay(500);
StatoCascina = "Spenta";
Detezione = 3;
}
delay(50);
Temperatura ();
delay(50);
}
void DatiPannello ()
{
uint8_t resultMain;
resultMain = node.readInputRegisters(0x3300,19);
if (resultMain == node.ku8MBSuccess)
{
Serial.println(Lettera);
//Serial.println("------------");
Serial.print(F("Maximum input volt(PV) today: "));
MaximumInputVoltPVToday = (node.getResponseBuffer(0x00)/100.0f);
Serial.print(MaximumInputVoltPVToday);
Serial.println(F(" V"));
//-----------------------------------------------
Serial.print(F("Minimum input volt(PV) today: "));
MinimumInputVoltPVToday = (node.getResponseBuffer(0x01)/100.0f);
Serial.print(MinimumInputVoltPVToday);
Serial.println(F(" V"));
//---------------------------------------------
Serial.print(F("Maximum battery volt today: "));
MaximumBatteryVoltToday = (node.getResponseBuffer(0x02)/100.0f);
Serial.print(MaximumBatteryVoltToday);
Serial.println(F(" V"));
//-----------------------------------------------
Serial.print(F("Minimum battery volt today: "));
MinimumBatteryVoltToday = (node.getResponseBuffer(0x03)/100.0f);
Serial.print(MinimumBatteryVoltToday);
Serial.println(F(" V"));
//-----------------------------------------------
Serial.print(F("Consumed energy today: "));
ConsumedEnergyToday = (node.getResponseBuffer(0x04)/100.0f);
Serial.print(ConsumedEnergyToday);
Serial.println(F(" Kw"));
//-----------------------------------------------
Serial.print(F("Generated energy today: "));
GeneratedEnergyToday = (node.getResponseBuffer(0x0C)/100.0f);
Serial.print(GeneratedEnergyToday);
Serial.println(F(" Kw"));
//-----------------------------------------------
Serial.print(F("Total consumed: "));
TotalConsumed = (node.getResponseBuffer(0x0A)/100.0f);
Serial.print(TotalConsumed);
Serial.println(F(" Kw"));
//-----------------------------------------------
Serial.print(F("Total generated: "));
TotalGenerated = (node.getResponseBuffer(0x12)/100.0f);
Serial.print(TotalGenerated);
Serial.println(F(" Kw"));
//-----------------------------------------------
Serial.print(F("Cascina: "));
Serial.println(StatoCascina);
//-----------------------------------------------
Serial.print(F("Temperatura massima: "));
Serial.print(TempMax);
Serial.println(" *C");
Serial.print(F("Temperatura minima: "));
Serial.print(TempMin);
Serial.println(" *C");
Serial.print(F("Umidita massima: "));
Serial.print(UmidMax);
Serial.println(" H");
Serial.print(F("Umidita minima: "));
Serial.print(Umidmin);
Serial.println(F(" H"));
Serial.println(FreddoCaldo);
}
}
void Temperatura (){
// start working...
Serial2.println("=================================");
Serial2.println("Sample DHT11...");
int err = SimpleDHTErrSuccess;
if ((err = dht11.read(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
Serial2.print("Read DHT11 failed, err="); Serial2.println(err);delay(1000);
return;
}
Serial2.print((int)temperature);
Temp = (int)temperature;
Serial2.print((int)humidity);
Umidita = (int)humidity;
// DHT11 sampling rate is 1HZ.
if(i == 0)
{
TempMin = Temp;
Umidmin = Umidita;
i = 1;
}
if(Temp > TempMax){
TempMax = Temp;
}
if(Temp < TempMin){
TempMin = Temp;
}
FreddoCaldo = "Temperatura Normale";
if(Freddo > TempMin){
Lettera = 'A';
FreddoCaldo = "Freddo Portatemi Giu";
}
if(Umidita > UmidMax){
UmidMax = Umidita;
}
if(Umidita < Umidmin){
Umidmin = Umidita;
}
}
Python:
import serial
import time
lista = []
ser = serial.Serial('COM8',baudrate=9600)#sudo ls /dev/tty*
for n in range(1):
time.sleep(1)
ser.write(b'M')
time.sleep(1)
def getValues():
arduinoData = ser.readline().decode('utf-8')
return arduinoData
for n in range(17):
lista.append(getValues())
for stringa in lista:
print(stringa)
file1 = open("ValoriImpianto.txt","w")
for stringa in lista:
file1.write(stringa)
file1.close()
What I read as a serial:
0
C
Maximum input volt(PV) today: 114.80 V
Minimum input volt(PV) today: 5.68 V
Maximum battery volt today: 13.02 V
Minimum battery volt today: 11.40 V
Consumed energy today: 0.12 Kw
Generated energy today: 0.09 Kw
Total consumed: 15.82 Kw
Total generated: 58.26 Kw
Cascina: Spenta
Temperatura massima: 17 *C
Temperatura minima: 17 *C
Umidita massima: 65 H
Umidita minima: 65 H
Temperatura Normale
1
and the second time I throw it out the same thing, I'd expect to read 1 at the beginning and 1 at the end...
