@vshymanskyy please advise.
It is clear that the BLYNK library is primarily designed to work with the cloud and without a connection in some cases should not do anything on the device, nevertheless, it is a very big surprise to me that all the code is blocked without wifiā¦ for me and for many, as I have read on the forums, a very acute question. I donāt want to use third-party code to get around this problem
In the first project, I used the previous version of BLINK as a gateway and all other devices received commands over the wires. It was a complex, expensive and inconvenient architecture to set up. She demanded a device in each room that would send commands over the wires. In a new project, I use BLINK 2.0 and wanting to simplify the architecture, I removed the gateway and made my own WiFi module based on ESP8266 in each device. How wrong I wasā¦
Have you tried managing your own WiFi connection then using Blynk.config and Blynk.connect rather than the blocking Blynk.begin command?
Pete.
not yet. Iām not a programmer, itās hard for me to understand someone elseās codeā¦ if there is a simple solution it would save me. I use BlynkEdgent
Yury
You would like to use the nodemcu offline am I right ?
What is the basic functionality of your device ? Controlling appliances, monitoring temp, erc etc !?
If yes !! Why dont you put your code inside an ISR ? This will keep running despite the wifi being connected or disconnected.
Try this.
Thatās right, itās a classic. If WI-Fi is available, I use the application, if not, a physical button.
I have a critical situation, so Iām ready to put the code anywhere, as long as it works!!! 
Just show me in more detail how to do it, please
I would suggest you to post your code. So that we can have a look and see what needs to done !!
Are you suggesting I handle the buttons in the interrupt? Wonāt that make the BLINK code unstable?
Exactly.
Depends on how you code. But we have many examples on this forum. Search ISR switch. And you will get plenty of examples.
#define BLYNK_NO_BUILTIN // Disable built-in analog & digital pin operations
#define BLYNK_NO_FLOAT // Disable float operations
#define BLYNK_TEMPLATE_ID "***"
#define BLYNK_DEVICE_NAME "RELABOX"
#define BLYNK_FIRMWARE_VERSION "0.1.283"
#define BLYNK_PRINT Serial
#define LED_CONN 0
#define INT_PIN 13 // microcontroller pin attached to INTA/B
#include "BlynkEdgent.h"
#include "Adafruit_MCP23017.h"
#include <Wire.h>
Adafruit_MCP23017 mcpOut;
Adafruit_MCP23017 mcpInp;
int relayPins[8][2] = {{0,1},{2,3},{4,5},{6,7},{8,9},{10,11},{12,13},{14,15}};
bool inpLastState[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
bool relayToggled[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
bool btn;
BLYNK_CONNECTED() {
Blynk.syncAll();
Blynk.syncVirtual(V0,V1,V2,V3,V4,V5,V6,V7,V8,V9,V10,V11,V12,V13);
}
BLYNK_WRITE(V0)
{
relayChangeState(0, (bool)param.asInt());
}
BLYNK_WRITE(V1)
{
relayChangeState(1, (bool)param.asInt());
}
BLYNK_WRITE(V2)
{
relayChangeState(2, (bool)param.asInt());
}
BLYNK_WRITE(V3)
{
relayChangeState(3, (bool)param.asInt());
}
BLYNK_WRITE(V4)
{
relayChangeState(4, (bool)param.asInt());
}
BLYNK_WRITE(V5)
{
relayChangeState(5, (bool)param.asInt());
}
BLYNK_WRITE(V6)
{
relayChangeState(6, (bool)param.asInt());
}
BLYNK_WRITE(V7)
{
relayChangeState(7, (bool)param.asInt());
}
void cloudState()
{
if(Blynk.connected())
digitalWrite(LED_CONN,1);
else
digitalWrite(LED_CONN,!digitalRead(LED_CONN));
}
void setup()
{
Serial.begin(115200);
delay(100);
BlynkEdgent.begin();
Wire.begin(14, 12);
mcpOut.begin(); // use default address 0
mcpInp.begin(1); // use default address 0
for(int i =0; i <16; i++){
mcpOut.pinMode(i, OUTPUT);
mcpOut.digitalWrite(i,0);
mcpInp.pinMode(i, INPUT);
mcpInp.pullUp(i, HIGH); // turn on a 100K pullup internally
}
pinMode(LED_CONN,OUTPUT);
pinMode(INT_PIN,INPUT);
digitalWrite(LED_CONN,0);
timer.setInterval(300L, cloudState);
}
void relayChangeState(int i, bool _state)
{
mcpOut.digitalWrite(relayPins[i][_state],1);
delay(40);
mcpOut.digitalWrite(relayPins[i][_state],0);
if(_state)
inpLastState[i] = 1;
else
inpLastState[i] = 0;
}
void buttonPressed(){
for(int i = 0; i<16;i++){
btn = !mcpInp.digitalRead(i);
if(btn && !relayToggled[i]){
relayToggled[i] = true;
toggleState(i);
}else if(!btn)
relayToggled[i] = false;
}
}
void toggleState(int i)
{
if(inpLastState[i] == 1){
if(Blynk.connected()){
Blynk.virtualWrite(i, 0);
Blynk.syncVirtual(i);
}else
relayChangeState(i,0);
inpLastState[i] = 0;
}else
{
if(Blynk.connected()){
Blynk.virtualWrite(i, 1);
Blynk.syncVirtual(i);
}else
relayChangeState(i,1);
inpLastState[i] = 1;
}
}
void loop() {
BlynkEdgent.run();
timer.run();
buttonPressed();
}Check this out :
Use this library from @khoihā¦.
Place the code that is responsible for controlling the relay inside ISR. This should work.
Thank you, I understand the meaning, but it doesnāt suit me because after the Internet appears, you have to manually press reset.
1 Like
Thank you, I will try
Thatās not right, it will reconnect automatically.
I added the code as a Technical Research cell on the YouTube channel, but my code does not work, there are errors - there is no such function. In general, itās likeā¦ I just wouldnāt want to go down this path because when you have a lot of devices, itās better to go the way that the developers have provided in their code. in
In file included from C:\Users\Jury\Documents\Arduino\MySensors\ESP8266\RELABOX\Relabox\Relabox.ino:28:0:
C:\Users\Jury\Documents\Arduino\MySensors\ESP8266\RELABOX\Relabox\BlynkEdgent.h: In function 'void app_loop()':
BlynkEdgent.h:114:20: error: 'manual_control' was not declared in this scope
manual_control();
^
exit status 1
'manual_control' was not declared in this scopePart of code
Edgent BlynkEdgent;
BlynkTimer timer;
void app_loop() {
timer.run();
manual_control();
}
void manual_control()
{
digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
}