Hi everybody.
I am developing an heating system control with two units one is base the other is client. Base is sensing temp with DHT22 and on application side “set temp” can be adjusted with step widget. The measured temp is compared with set and if there is 0.5 celcius difference occurs base unit sends on or off signal to client through bridge widget. There is also nokia screen on base side where you can see the relative info.
Base unit is Wemos D1 min, client Nodemcu 12e.
When i start both units every thing works fine but after a while base doesn’t command client. When I check connection both unit is online and also working, since i can reach both units through android app and control them. I couldn’t solve the problem.
What am i doing wrong.
Here is Base side Code
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
//#define BLYNK_DEBUG // Optional, this enables lots of prints
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
char auth[] = "xxxxx";
SimpleTimer timer;
WidgetBridge bridge1(V2); //Bridge
// Software SPI (slower updates, more flexible pin options):
// pin D3 - LCD reset (RST) 0
// pin D4 - LCD chip select (CE) 2
// pin D5 - Data/Command select (DC) 14
// pin D2 - Serial data out (DIN) 4
// pin D0 - Serial clock out (CLK) 16
// pin 3.3 - Serial clock out (VCC)
// pin GND - Serial clock out (LIGHT)
// pin GND - Serial clock out (GND)
Adafruit_PCD8544 display = Adafruit_PCD8544(16, 4, 14, 2, 0);
#include "DHT.h"
#define DHTPIN 5 // D1 pin what pin we're connected to
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
float h ; // Humidity
float t ; // Temperature
float pin0Value; // Setted Temperature
bool isFirstConnect = true;
bool kombist = false; // Heating System Status
int conn= 2; // Builtin led pin which shows the Connection Status for BLYNK
void Kombi() // This is the Heating System Controling Code
{
if (t <= pin0Value - 0.5) // Checks the temp with setted temp if temp low switches the heating system
{
bridge1.digitalWrite(16, 1);
bridge1.virtualWrite(V1, 1);
Serial.println("Yandi");
kombist = true;
}
if (t >= pin0Value + 0.5)
{
bridge1.digitalWrite(16, 0);
bridge1.virtualWrite(V1, 0);
Serial.println("Sondu");
kombist = false;
}
if (kombist) // This code for when the temp is between set-0.5 and set+0.5
{
bridge1.digitalWrite(16, 1);
bridge1.virtualWrite(V1, 1);
Serial.println("Yandi");
}
else
{
bridge1.digitalWrite(16, 0);
bridge1.virtualWrite(V1, 0);
Serial.println("Sondu");
}
}
BLYNK_CONNECTED()
{
if (isFirstConnect) {
// Request Blynk server to re-send latest values for all pins
Blynk.syncAll();
// You can also update individual virtual pins like this:
//Blynk.syncVirtual(V0, V1, V4);
isFirstConnect = false;
bridge1.setAuthToken("xxxx"); // Place the AuthToken of the second hardware here
}
}
BLYNK_WRITE(V0) // This set temp widget
{
pin0Value = param.asFloat(); // assigning incoming value from pin V1 to a variable
// You can also use:
// String i = param.asStr();
// double d = param.asDouble();
if (t < pin0Value) // This code is for, controlling the heating system when adjusting temp.
{
bridge1.digitalWrite(16, 1);
bridge1.virtualWrite(V2, 1);
Serial.println("Yandi");
kombist = true;
}
if (t > pin0Value)
{
bridge1.digitalWrite(16, 0);
bridge1.virtualWrite(V2, 0);
Serial.println("Sondu");
kombist = false;
}
// Code Below is writing the relative info to screen when seting temp
display.setCursor(0,0);
display.setTextSize(2);
display.clearDisplay(); // clears the screen and buffer
display.print("ISI");
display.setTextSize(1);
display.print("St");
display.println(pin0Value);
display.println();
display.setTextSize(2);
display.print(t);
display.println("C");
display.setTextSize(1);
display.print("Nem:");
display.print(h);
display.println(" %");
display.display();
}
void sendUptime() // This is temp measuring and writting code to virtual pins
{
h = dht.readHumidity();
t = dht.readTemperature();
// t = t - 0.5;
Blynk.virtualWrite(10, t); // virtual pin Temp
Blynk.virtualWrite(11, h); // virtual pin Humidity
Blynk.virtualWrite(1, pin0Value); // virtual pin Set Temp
}
void ekranayaz() // This code is screen update code. It was in sendUptime code but i realized that it causes connection drop so i seperated.
{
h = dht.readHumidity();
t = dht.readTemperature();
display.setCursor(0,0);
if (isnan(t) || isnan(h))
{
display.println("Failed to read from DHT");
}
else
{
display.setTextSize(2);
display.clearDisplay(); // clears the screen and buffer
display.print("ISI");
display.setTextSize(1);
display.print("St");
display.println(pin0Value);
display.println();
display.setTextSize(2);
display.print(t);
display.println("C");
display.setTextSize(1);
display.print("Nem:");
display.print(h);
display.println(" %");
display.display();
}
}
void reconnectBlynk() { // reconnect to server if disconnected, timer checks every 60 seconds
if (!Blynk.connected())
{
if(Blynk.connect())
{
BLYNK_LOG("Reconnected");
}
else
{
BLYNK_LOG("Not reconnected");
}
}
}
void setup()
{
Serial.begin(115200);
pinMode(conn, OUTPUT); // This is builtin led pin that shows connection status
digitalWrite(conn, HIGH); // Actually this is low on physical side
display.begin();
display.setContrast(50);
display.clearDisplay(); // clears the screen and buffer
display.setTextColor(BLACK);
display.setTextSize(1);
display.clearDisplay(); // clears the screen and buffer
display.println("Connecting");
display.display();
Blynk.begin(auth, "xxx", "xxxx"); //insert here your SSID and password
display.println("Connected");
display.display();
dht.begin();
timer.setInterval(5000L, sendUptime); // This updates measurements
timer.setInterval(60000L, reconnectBlynk); // check every 60 seconds if we are connected to
timer.setInterval(10000L, Kombi); // Sends client on or off
timer.setInterval(30000L, ekranayaz); // Screen update
}
void loop() {
if (Blynk.connected())
{ // to ensure that Blynk.run() function is only called if we are still connected to the server
Blynk.run();
digitalWrite(conn,LOW); // If connection ok builtin led on
}
else
{
digitalWrite(conn,HIGH); // If connection drops builtin led off
}
timer.run();
}
On Client Side is so simple and code as follows
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
SimpleTimer timer;
WidgetLED led1(V0); // This for check the status through app
int pinData; // Heating system can be controlled over app also
bool isFirstConnect = true;
int ledpin = 16; // This pin for relay if everthing works fine :)
int conn = 2; // NodeMCU builtin led pin
char auth[] = "xxx";
char ssid[] = "xxx";
char pass[] = "xxxx";
void KD() // Heating system check script every 5 sec and update to blynk virtual pins
{
int pinValueRed = digitalRead (ledpin);
if (pinValueRed == 1)
{
led1.on();
Blynk.virtualWrite(10, 100); // virtual pin to see the status through history graph
Serial.println("Kombi Acik");
}
else
{
led1.off();
Blynk.virtualWrite(10, 0); // virtual pin
Serial.println("Kombi Kapali");
}
}
BLYNK_CONNECTED() {
if (isFirstConnect) {
// Request Blynk server to re-send latest values for all pins
Blynk.syncAll();
//
// You can also update individual virtual pins like this:
// Blynk.syncVirtual(V0, V1, V4);
isFirstConnect = false;
}
}
BLYNK_WRITE(V1) // This is for button widget
{
pinData = param.asInt(); // pinData variable will store value that came via Bridge
digitalWrite(ledpin, pinData);
}
void AutoOff() // This code for safety. Every hour switch off system
{
digitalWrite(ledpin, 0);
}
void reconnectBlynk() { // reconnect to server if disconnected, timer checks every 60 seconds
if (!Blynk.connected()) {
if(Blynk.connect()) {
BLYNK_LOG("Reconnected");
} else {
BLYNK_LOG("Not reconnected");
}
}
}
void setup()
{
Serial.begin(115200);
pinMode(ledpin, OUTPUT);
pinMode(conn, OUTPUT);
digitalWrite(conn,HIGH);
Blynk.begin(auth, ssid, pass);
timer.setInterval(3600000L, AutoOff); // Safety Code . Every hour switch off system
timer.setInterval(5000L, KD); // Check heating system status every 5 sec and update blynk
timer.setInterval(60000L, reconnectBlynk); // check every 60 seconds if we are connected to
}
void loop()
{
if (Blynk.connected())
{ // to ensure that Blynk.run() function is only called if we are still connected to the server
Blynk.run();
digitalWrite(conn,LOW); // If connection ok builtin led on
}
else
{
digitalWrite(conn,HIGH);// If connection drops builtin led off
}
timer.run();
}
This could be a case study for bridge widget.
Thanx
By the way i am using Blynk_Release_v0.4.4 libraries.
Arduino IDE 1.8.1
to run two unit with same auth code. Virtual pins don’t interfere?