Hello
I found this project in youtube.Basic works like when car in front of the IR sensor we saw the light on blyk app.But i cant do it damn thing didnt work.Please Help
Try to make as a project and i am failing.I am new to arduino.I need to help for code and design.
I try to communicate arduino and nodeMCU each other via using Rx,Tx.Rx blinks but Tx completely light off.I think i am making mistake there but i dont know how to comminicate correctly.Also i didnt understand why using this "," in front of the cdata.In addition here why he uses SoftwareSerial nodemcu(2,3); in his code my Tx Rx in 0 and 1 i am right in that departmant right?At last one of my friends told me change string with unsigned char is that okay too?
Arduino code side:
#include <SoftwareSerial.h>
SoftwareSerial nodemcu(0,1);
int parking1_slot1_ir_s = 4; // parking slot1 infrared sensor connected with pin number 4 of arduino
int parking1_slot2_ir_s = 5;
int parking2_slot1_ir_s = 6;
int parking2_slot2_ir_s = 7;
String sensor1;
String sensor2;
String sensor4;
String sensor5;
String cdata =""; // complete data, consisting of sensors values
void setup()
{
Serial.begin(115200);
nodemcu.begin(115200);
pinMode(parking1_slot1_ir_s, INPUT);
pinMode(parking1_slot2_ir_s, INPUT);
pinMode(parking2_slot1_ir_s, INPUT);
pinMode(parking2_slot2_ir_s, INPUT);
}
void loop()
{
p1slot1();
p1slot2();
p2slot1();
p2slot2();
cdata = cdata + sensor1 +"," + sensor2 + ","+ sensor4 + "," + sensor5 + ","; // comma will be used a delimeter
Serial.println(cdata);
nodemcu.println(cdata);
delay(6000); // 100 milli seconds
cdata = "";
digitalWrite(parking1_slot1_ir_s, HIGH);
digitalWrite(parking1_slot2_ir_s, HIGH);
digitalWrite(parking2_slot1_ir_s, HIGH);
digitalWrite(parking2_slot2_ir_s, HIGH);
}
void p1slot1() // parkng 1 slot1
{
if( digitalRead(parking1_slot1_ir_s) == LOW)
{
sensor1 = "255";
delay(200);
}
if( digitalRead(parking1_slot1_ir_s) == HIGH)
{
sensor1 = "0";
delay(200);
}
}
void p1slot2() // parking 1 slot2
{
if( digitalRead(parking1_slot2_ir_s) == LOW)
{
sensor2 = "255";
delay(200);
}
if( digitalRead(parking1_slot2_ir_s) == HIGH)
{
sensor2 = "0";
delay(200);
}
}
// now for parking 2
void p2slot1() // parking 1 slot3
{
if( digitalRead(parking2_slot1_ir_s) == LOW)
{
sensor4 = "255";
delay(200);
}
if( digitalRead(parking2_slot1_ir_s) == HIGH)
{
sensor4 = "0";
delay(200);
}
}
void p2slot2() // parking 1 slot3
{
if( digitalRead(parking2_slot2_ir_s) == LOW)
{
sensor5 = "255";
delay(200);
}
if( digitalRead(parking2_slot2_ir_s) == HIGH)
{
sensor5 = "0";
delay(200);
}
}
I checked the nodeMCU.I think is working because when i pressed serial screen i am seeing this.(oppo my phones WIFI name)
[66]Connecting to oppo
[29078] Connected to WiFi
[29078] IP: 192.168.43.10
[29078]
___ __ __
/ _ )/ /_ _____ / /__
/ _ / / // / _ \/ '_/
/____/_/\_, /_//_/_/\_\
/___/ v0.6.1 on ESP8266
[29085] Connecting to blynk-cloud.com:80
[29299] Ready (ping: 92ms).
NodeMCU Code Side:
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SoftwareSerial.h>
#include <SimpleTimer.h>
char auth[] = "wkPngtXcgwlrBbo8bBcradtkAYuBxsav";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "oppo";
char pass[] = "12345678";
SimpleTimer timer;
String myString; // complete message from arduino, which consistors of snesors data
char rdata; // received charactors
int firstVal, secondVal,thirdVal; // sensors
int led1,led2,led4,led5;
// This function sends Arduino's up time every second to Virtual Pin (1).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void myTimerEvent()
{
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V1, millis() / 1000);
}
void setup()
{
// Debug console
Serial.begin(115200);
Blynk.begin(auth, ssid, pass);
timer.setInterval(1000L,sensorvalue1);
timer.setInterval(1000L,sensorvalue2);
timer.setInterval(1000L,sensorvalue4);
timer.setInterval(1000L,sensorvalue5);
}
void loop()
{
if (Serial.available() == 0 )
{
Blynk.run();
timer.run(); // Initiates BlynkTimer
}
if (Serial.available() > 0 )
{
rdata = Serial.read();
myString = myString+ rdata;
// Serial.print(rdata);
if( rdata == '\n')
{
Serial.println(myString);
// Serial.println("fahad");
// new code
String l = getValue(myString, ',', 0);
String m = getValue(myString, ',', 1);
String o = getValue(myString, ',', 2);
String p = getValue(myString, ',', 3);
// these leds represents the leds used in Blynk application
led1 = l.toInt();
led2 = m.toInt();
led4 = o.toInt();
led5 = p.toInt();
myString = "";
// end new code
}
}
}
void sensorvalue1()
{
int sdata = led1;
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V10, sdata);
}
void sensorvalue2()
{
int sdata = led2;
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V11, sdata);
}
void sensorvalue4()
{
int sdata = led4;
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V13, sdata);
}
void sensorvalue5()
{
int sdata = led5;
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V14, sdata);
}
String getValue(String data, char separator, int index)
{
int found = 0;
int strIndex[] = { 0, -1 };
int maxIndex = data.length() - 1;
for (int i = 0; i <= maxIndex && found <= index; i++) {
if (data.charAt(i) == separator || i == maxIndex) {
found++;
strIndex[0] = strIndex[1] + 1;
strIndex[1] = (i == maxIndex) ? i+1 : i;
}
}
return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}
