ESP8266: UDP broadcast receiver

 

ESP8266 UDP broadcast receiver

 

 

/*
Wireless Serial using UDP ESP8266
Hardware: NodeMCU
Circuits4you.com
2018
UDP Broadcast multi esp to esp communication
*/

#include <Wire.h> // Enable this line if using Arduino Uno, Mega, etc.

#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

Adafruit_7segment matrix = Adafruit_7segment();

#include <ESP8266WiFi.h>
#include <WiFiUdp.h>

const char *ssid = "KMTRONIC";
const char *pass = "KMTRONIC";

unsigned int localPort = 12345; // local port to listen for UDP packets

IPAddress SendIP(192,168,1,255); //UDP Broadcast IP data sent to all devicess on same network

// A UDP instance to let us send and receive packets over UDP
WiFiUDP udp;

char packetBuffer[9]; //Where we get the UDP data
float temp;
//======================================================================
// Setup
//=======================================================================
void setup()
{
matrix.begin(0x70);

Serial.begin(115200);
Serial.println();

WiFi.begin(ssid, pass); //Connect to access point

Serial.println("");

// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());

//Start UDP
Serial.println("Starting UDP");
udp.begin(localPort);
Serial.print("Local port: ");
Serial.println(udp.localPort());
}
//======================================================================
// MAIN LOOP
//======================================================================
void loop()
{
int cb = udp.parsePacket();
if (!cb) 
{
//If serial data is recived send it to UDP
if(Serial.available()>0)
{
udp.beginPacket(SendIP, 2000); //Send Data to Master unit
//Send UDP requests are to port 2000

char a[1];
a[0]=char(Serial.read()); //Serial Byte Read
udp.write(a,1); //Send one byte to ESP8266 
udp.endPacket();
}
}
else {
// We've received a UDP packet, send it to serial
memset(packetBuffer, 0, sizeof(packetBuffer));
udp.read(packetBuffer, 10); // read the packet into the buffer, we are reading only one byte
Serial.println(packetBuffer);
delay(20);
temp = atof (packetBuffer);
matrix.print(temp);
matrix.writeDisplay();
}
}
//=======================================================================

 

 

PHP broadcast

<?php

while(1) {
// Loading the XML file
$xml = simplexml_load_file("http://192.168.1.199/status.xml");

foreach($xml->children() as $sensor)
{
if ($sensor->name == "Office 1" )
{
$msg = $sensor->temp;
//echo $msg . "\r\n";
}
}


$sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); 

$len = strlen($msg); 

echo $msg . "\r\n";

socket_set_option($sock, SOL_SOCKET, SO_BROADCAST, 1);

socket_sendto($sock, $msg, $len, 0 ,'192.168.1.255', 12345);

socket_close($sock);
usleep(500000);

}

?>

 

 

 

ESP8266: Adafruit VEML6070 I2C Test

ESP8266: Adafruit VEML6070 I2C Test

 

ESP8266: Adafruit VEML6070 I2C Test
ESP8266: Adafruit VEML6070 I2C Test


Connection:

– NodeMCU GPIO0 -> D1 -> SCL (VEML6070)
– NodeMCU GPIO4 -> D2 -> SDA (VEML6070)
– NodeMCU +3.3 -> 3V3 -> VCC (VEML6070)
– NodeMCU GND -> GND -> GND (VEML6070)

Arduino code:

#include <Wire.h>
#include "Adafruit_VEML6070.h"

Adafruit_VEML6070 uv = Adafruit_VEML6070();

void setup() {
Serial.begin(9600);
Serial.println("VEML6070 Test");
uv.begin(VEML6070_1_T); // pass in the integration time constant
}


void loop() {
Serial.print("UV light level: "); Serial.println(uv.readUV());

delay(1000);
}

 

ESP8266: Adafruit VEML6070 I2C Test
ESP8266: Adafruit VEML6070 I2C Test

 

ESP8266: Adafruit VEML6070 I2C Test
ESP8266: Adafruit VEML6070 I2C Test

 

 

 

ESP8266: HT-16k33 7 Segment I2C Test

 

ESP8266: HT-16k33 7 Segment I2C Test

ESP8266: HT-16k33 7 Segment I2C Test
ESP8266: HT-16k33 7 Segment I2C Test

 

 

Connection:

– NodeMCU GPIO0 -> D1 -> SCL (HT-16k33)
– NodeMCU GPIO4 -> D2 -> SDA (HT-16k33)
– NodeMCU +3.3 -> 3V3 -> VCC (HT-16k33)
– NodeMCU GND -> GND -> GND (HT-16k33)

 

Library:

https://github.com/adafruit/Adafruit_LED_Backpack 

 

Arduino code:

/*************************************************** 
This is a library for our I2C LED Backpacks

Designed specifically to work with the Adafruit LED 7-Segment backpacks 
----> http://www.adafruit.com/products/881
----> http://www.adafruit.com/products/880
----> http://www.adafruit.com/products/879
----> http://www.adafruit.com/products/878

These displays use I2C to communicate, 2 pins are required to 
interface. There are multiple selectable I2C addresses. For backpacks
with 2 Address Select pins: 0x70, 0x71, 0x72 or 0x73. For backpacks
with 3 Address Select pins: 0x70 thru 0x77

Adafruit invests time and resources providing this open source code, 
please support Adafruit and open-source hardware by purchasing 
products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries. 
BSD license, all text above must be included in any redistribution
****************************************************/

// Enable one of these two #includes and comment out the other.
// Conditional #include doesn't work due to Arduino IDE shenanigans.
#include <Wire.h> // Enable this line if using Arduino Uno, Mega, etc.
//#include <TinyWireM.h> // Enable this line if using Adafruit Trinket, Gemma, etc.

#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

Adafruit_7segment matrix = Adafruit_7segment();

void setup() {
#ifndef __AVR_ATtiny85__
Serial.begin(9600);
Serial.println("7 Segment Backpack Test");
#endif
matrix.begin(0x70);
}

void loop() {


// print a hex number
matrix.print(0xBEEF, HEX);
matrix.writeDisplay();
delay(500);

// print a floating point 
matrix.print(12.34);
matrix.writeDisplay();
delay(500);

// print with print/println
for (uint16_t counter = 0; counter < 9999; counter++) {
matrix.println(counter);
matrix.writeDisplay();
delay(10);
}

// method #2 - draw each digit
uint16_t blinkcounter = 0;
boolean drawDots = false;
for (uint16_t counter = 0; counter < 9999; counter ++) {
matrix.writeDigitNum(0, (counter / 1000), drawDots);
matrix.writeDigitNum(1, (counter / 100) % 10, drawDots);
matrix.drawColon(drawDots);
matrix.writeDigitNum(3, (counter / 10) % 10, drawDots);
matrix.writeDigitNum(4, counter % 10, drawDots);

blinkcounter+=50;
if (blinkcounter < 500) {
drawDots = false;
} else if (blinkcounter < 1000) {
drawDots = true;
} else {
blinkcounter = 0;
}
matrix.writeDisplay();
delay(10);
}
}

 

 

ESP8266: Yet Another Arduino Wiegand Library

 

Yet Another Arduino Wiegand Library

 

 

#define PIN_D0 D1
#define PIN_D1 D2

// The object that handles the wiegand protocol
Wiegand wiegand;

// Initialize Wiegand reader
void setup() {
Serial.begin(9600);
delay(1);
Serial.println("Start...");

//Install listeners and initialize Wiegand reader
wiegand.onReceive(receivedData, "Card readed: ");
wiegand.onStateChange(stateChanged, "State changed: ");
wiegand.begin(WIEGAND_LENGTH_AUTO);

//initialize pins as INPUT
pinMode(PIN_D0, INPUT);
pinMode(PIN_D1, INPUT);
}

// Continuously checks for pending messages and polls updates from the wiegand inputs
void loop() {
// Checks for pending messages 
//Serial.println("Start2 ..");
wiegand.flush();

// Check for changes on the the wiegand input pins
wiegand.setPin0State(digitalRead(PIN_D0));
wiegand.setPin1State(digitalRead(PIN_D1));
}

// Notifies when a reader has been connected or disconnected.
// Instead of a message, the seconds parameter can be anything you want -- Whatever you specify on `wiegand.onStateChange()`
void stateChanged(bool plugged, const char* message) {
Serial.print(message);
Serial.println(plugged ? "CONNECTED" : "DISCONNECTED");
}

// Notifies when a card was read.
// Instead of a message, the seconds parameter can be anything you want -- Whatever you specify on `wiegand.onReceive()`
void receivedData(uint8_t* data, uint8_t bits, const char* message) {
Serial.print(message);

//Print value in HEX
uint8_t bytes = (bits+7)/8;
for (int i=0; i<bytes; i++) {
Serial.print(data[i] >> 4, 16);
Serial.print(data[i] & 0xF, 16);
}
Serial.println();
}

 

ESP8266: Reading Voltage from SDM120 Modbus Power Energy Meter

 

http://en.trialcommand.com/blog/esp8266-slave-modbus-tcpip-no-libraries/

 

 

/*
 * More Tutorials: 
 * Website http://trialcommand.com
 * In English: http://en.trialcommand.com
 * En Español: http://en.trialcommand.com 
 */
#include <ESP8266WiFi.h>

const char* ssid = "KMTRONIC";
const char* password = "12345678";

// RS485 Control pin
const int RS485_control = D0;

// Receive buffer
long Buffer[9];

int VoltageReadCommand[] ={0x01, 0x04, 0x00, 0x00, 0x00, 0x02, 0x71, 0xCB};

int ModbusTCP_port = 502;

//////// Required for Modbus TCP / IP /// Requerido para Modbus TCP/IP /////////
#define maxInputRegister 20
#define maxHoldingRegister 20

#define MB_FC_NONE 0
#define MB_FC_READ_REGISTERS 3 //implemented
#define MB_FC_WRITE_REGISTER 6 //implemented
#define MB_FC_WRITE_MULTIPLE_REGISTERS 16 //implemented
//
// MODBUS Error Codes
//
#define MB_EC_NONE 0
#define MB_EC_ILLEGAL_FUNCTION 1
#define MB_EC_ILLEGAL_DATA_ADDRESS 2
#define MB_EC_ILLEGAL_DATA_VALUE 3
#define MB_EC_SLAVE_DEVICE_FAILURE 4
//
// MODBUS MBAP offsets
//
#define MB_TCP_TID 0
#define MB_TCP_PID 2
#define MB_TCP_LEN 4
#define MB_TCP_UID 6
#define MB_TCP_FUNC 7
#define MB_TCP_REGISTER_START 8
#define MB_TCP_REGISTER_NUMBER 10

byte ByteArray[260];
unsigned int MBHoldingRegister[maxHoldingRegister];

//////////////////////////////////////////////////////////////////////////

WiFiServer MBServer(ModbusTCP_port);

void setup() {

pinMode(14, OUTPUT);

// Set RS485 Control pin to OUTPUT
 pinMode(RS485_control, OUTPUT); 
 
 // Set pin to send data HIGH
 digitalWrite(RS485_control, HIGH);
 
 Serial.begin(2400);
 delay(100) ;
 WiFi.begin(ssid, password);
 delay(100) ;
 Serial.println(".");
 while (WiFi.status() != WL_CONNECTED) {
 delay(500);
 Serial.print(".");
 }
 MBServer.begin();
 Serial.println("Connected ");
 Serial.print("ESP8266 Slave Modbus TCP/IP ");
 Serial.print(WiFi.localIP());
 Serial.print(":");
 Serial.println(String(ModbusTCP_port));
 Serial.println("Modbus TCP/IP Online");
 
}


void loop() {

// Check if a client has connected // Modbus TCP/IP
 WiFiClient client = MBServer.available();
 if (!client) {
 return;
 }


 boolean flagClientConnected = 0;
 byte byteFN = MB_FC_NONE;
 int Start;
 int WordDataLength;
 int ByteDataLength;
 int MessageLength;
 
 // Modbus TCP/IP
 while (client.connected()) {
 
 if(client.available())
 {
 flagClientConnected = 1;
 int i = 0;
 while(client.available())
 {
 ByteArray[i] = client.read();
 i++;
 }

client.flush();

///// code here --- codigo aqui

///////// Holding Register [0] A [9] = 10 Holding Registers Escritura
 ///////// Holding Register [0] A [9] = 10 Holding Registers Writing
 
 // Set pin to HIGH > Transmit mode
 digitalWrite(RS485_control, HIGH); 
 
 // Send command to ModBus Meter
 for (int i=0; i < 8; i++) Serial.write(VoltageReadCommand[ i ]);
 delay(50);

// Set pin to LOW > Receive mode
 digitalWrite(RS485_control, LOW);
 
 // Waiting for receive reply
 while ( Serial.available()<9); 
 
 // Read reply in Buffer[];
 for (int i=0; i < 9; i++) Buffer[i] = Serial.read();

// Print voltage data received
 Serial.println();
 Serial.print(Buffer[3], HEX); Serial.print(" ");
 Serial.print(Buffer[4], HEX); Serial.print(" ");
 Serial.print(Buffer[5], HEX); Serial.print(" ");
 Serial.print(Buffer[6], HEX); Serial.print(" "); 
 Serial.println();

// Convert to Float
 float x;
 ((byte*)&x)[3]= Buffer[3];
 ((byte*)&x)[2]= Buffer[4];
 ((byte*)&x)[1]= Buffer[5];
 ((byte*)&x)[0]= Buffer[6];
 
 // Convert to Float
 Serial.print(x,2);
 Serial.println(" Volts");

MBHoldingRegister[0] = word(Buffer[3],Buffer[4]);
 MBHoldingRegister[1] = word(Buffer[5],Buffer[6]);
 MBHoldingRegister[4] = random(0,12);
 MBHoldingRegister[5] = random(0,12);
 MBHoldingRegister[6] = random(0,12);
 MBHoldingRegister[7] = random(0,12);
 MBHoldingRegister[8] = random(0,12);
 MBHoldingRegister[9] = random(0,12);


 ///////// Holding Register [10] A [19] = 10 Holding Registers Lectura
 ///// Holding Register [10] A [19] = 10 Holding Registers Reading
 
 int Temporal[10];
 
 Temporal[0] = MBHoldingRegister[10];
 Temporal[1] = MBHoldingRegister[11];
 Temporal[2] = MBHoldingRegister[12];
 Temporal[3] = MBHoldingRegister[13];
 Temporal[4] = MBHoldingRegister[14];
 Temporal[5] = MBHoldingRegister[15];
 Temporal[6] = MBHoldingRegister[16];
 Temporal[7] = MBHoldingRegister[17];
 Temporal[8] = MBHoldingRegister[18];
 Temporal[9] = MBHoldingRegister[19];

/// Enable Output 14
 digitalWrite(14, MBHoldingRegister[14] );


 //// debug

for (int i = 0; i < 10; i++) {

Serial.print("[");
 Serial.print(i);
 Serial.print("] ");
 Serial.print(Temporal[i]);
 
 }
 Serial.println("");


//// end code - fin 


//// rutine Modbus TCP
 byteFN = ByteArray[MB_TCP_FUNC];
 Start = word(ByteArray[MB_TCP_REGISTER_START],ByteArray[MB_TCP_REGISTER_START+1]);
 WordDataLength = word(ByteArray[MB_TCP_REGISTER_NUMBER],ByteArray[MB_TCP_REGISTER_NUMBER+1]);
 }
 
 // Handle request

switch(byteFN) {
 case MB_FC_NONE:
 break;
 
 case MB_FC_READ_REGISTERS: // 03 Read Holding Registers
 ByteDataLength = WordDataLength * 2;
 ByteArray[5] = ByteDataLength + 3; //Number of bytes after this one.
 ByteArray[8] = ByteDataLength; //Number of bytes after this one (or number of bytes of data).
 for(int i = 0; i < WordDataLength; i++)
 {
 ByteArray[ 9 + i * 2] = highByte(MBHoldingRegister[Start + i]);
 ByteArray[10 + i * 2] = lowByte(MBHoldingRegister[Start + i]);
 }
 MessageLength = ByteDataLength + 9;
 client.write((const uint8_t *)ByteArray,MessageLength);
 
 byteFN = MB_FC_NONE;
 
 break;
 
 
 case MB_FC_WRITE_REGISTER: // 06 Write Holding Register
 MBHoldingRegister[Start] = word(ByteArray[MB_TCP_REGISTER_NUMBER],ByteArray[MB_TCP_REGISTER_NUMBER+1]);
 ByteArray[5] = 6; //Number of bytes after this one.
 MessageLength = 12;
 client.write((const uint8_t *)ByteArray,MessageLength);
 byteFN = MB_FC_NONE;
 break;
 
 case MB_FC_WRITE_MULTIPLE_REGISTERS: //16 Write Holding Registers
 ByteDataLength = WordDataLength * 2;
 ByteArray[5] = ByteDataLength + 3; //Number of bytes after this one.
 for(int i = 0; i < WordDataLength; i++)
 {
 MBHoldingRegister[Start + i] = word(ByteArray[ 13 + i * 2],ByteArray[14 + i * 2]);
 }
 MessageLength = 12;
 client.write((const uint8_t *)ByteArray,MessageLength); 
 byteFN = MB_FC_NONE;
 
 break;
 }
 }

}