Fogyasztásmérő olvasása RS485 segítségével. SW-t igénylő kód Arduinohoz.

Videós tartalom: https://youtu.be/a1_RJxchlig

Kód, ami az előző képen látható mérővel megy (pirossajljelöltem a képen a típust)

#include <Adafruit_GFX.h>

#include <Adafruit_ST7735.h>

#define TFT_CS 10

#define TFT_RST 9

#define TFT_DC 8

#define TFT_SZELSEG 128

#define TFT_MAGASSAG 160

#define MODBUS_DIR_PIN 5 // connect DR, RE pin of MAX485

#include <ModbusMaster.h>

uint16_t addr=0x0000;

uint16_t addr_b=0x0000;

int i=0;

float x=0;

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

ModbusMaster node;

void modbusPreTransmission()

{

delay(500);

digitalWrite(MODBUS_DIR_PIN, HIGH);

}

// Pin 4 made low for Modbus receive mode

void modbusPostTransmission()

{

digitalWrite(MODBUS_DIR_PIN, LOW);

delay(500);

}

void setup()

{

tft.initR(INITR_BLACKTAB);

tft.fillScreen(ST7735_WHITE);

tft.setTextSize(2);

tft.setTextColor(ST7735_BLUE);

pinMode(LED_BUILTIN, OUTPUT);

// use Serial (port 0); initialize Modbus communication baud rate

Serial.begin(9600);

//Serial.begin(9600, SERIAL_8E1);

while (!Serial) {

; // wait for serial port to connect. Needed for native USB port only

}

pinMode(MODBUS_DIR_PIN, OUTPUT);

digitalWrite(MODBUS_DIR_PIN, LOW);

// communicate with Modbus slave ID 2 over Serial (port 0)

node.begin(1, Serial);

node.preTransmission(modbusPreTransmission);

node.postTransmission(modbusPostTransmission);

}

void loop()

{

uint8_t result;

uint16_t data[6];

// Read 24 registers starting at addr)

result = node.readInputRegisters(addr, 24);

if (result == node.ku8MBSuccess)

{

tft.setTextColor(ST7735_BLUE);

tft.setTextSize(2);

tft.fillRect(0, 0, TFT_SZELSEG, TFT_MAGASSAG, ST7735_WHITE);

tft.setCursor(15, 5);

x=node.getResponseBuffer(0x0000);

tft.print(x/10 , 1);

tft.print(" V");

tft.setCursor(15, 30);

x=node.getResponseBuffer(0x0003);

tft.print(x/100 , 3);

tft.print(" A");

tft.setCursor(15, 55);

tft.print(node.getResponseBuffer(0x0007));

tft.print(" VA");

tft.setCursor(15, 80);

tft.print(node.getResponseBuffer(0x0008));

tft.print(" W");

tft.setCursor(5, 105);

tft.setTextSize(1);

tft.setTextColor(ST7735_RED);

x=node.getResponseBuffer(0x0014);

tft.print("F: ");

tft.print(x/1000 , 3);

result = node.readInputRegisters(addr+26, 24);

if (result == node.ku8MBSuccess)

{

//tft.setCursor(5, 130);

tft.print(" ");

x=node.getResponseBuffer(0x0000);

tft.print(x/100 , 1);

tft.print(" Hz");

tft.setCursor(5, 119);

tft.print("Total: ");

x=node.getResponseBuffer(0x0004);

tft.print(x/100 , 2);

tft.print(" kWh");

tft.setCursor(5, 133);

tft.print("Export: ");

x=node.getResponseBuffer(0x0000+14);

tft.print(x/100 , 2);

tft.print(" kWh");

result = node.readInputRegisters(0x0032, 1);

if (result == node.ku8MBSuccess)

{

tft.setCursor(5, 148);

tft.print("Import: ");

x=node.getResponseBuffer(0x0000);

tft.print(x/100 , 2);

tft.print(" kWh");

}

}

}

delay(10000);

}