Hello,
Please help. I’m very new.
I used examples from the topic. It’s a small test program (a part) for a bigger project;
When compile, I receive the message ‘param’ was not declared in this scope. (in line: int i=param.asInt())
Where I’m wrong?
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "..........................";
const int pin=4;
void setup()
{
Serial.begin(9600);
Blynk.begin(auth, "...........................", "................");
pinMode(pin, OUTPUT);
}
void scriepin()
{
BLYNK_WRITE(3); //iin Blynk App a push button was created for virtual pin 3:
{
int i=param.asInt()
if i==1 {
//HIGH
digitalWrite(pin,HIGH);
} else {
//LOW
digitalWrite(pin,LOW);
}
}
}
void loop()
{
Blynk.run();
scriepin(); // a LED was installed on PIN4 through a 1K resistor
}
@ctlndobrescu please edit your post, select the sketch and then format it by pressing the </> icon.
You do not need the scriepin function as the Android / iPhone App sends the signal to the Blynk server and this in turn looks for BLYNK_WRITE(3); in your sketch.
Do you really need a 1K resistor as I would have thought 150 Ohms would be adequate?
Hello @Costas thanks for replay.
Starting with the resistor, usually I’m using a value around 470 ohms (arround 10mA). Right now I used 1K because I didn’t had a smaller value at that moment; but it’s only for tests and it’ enough…
Back to app.; first at all the button was switch not push, sorry. It’s only a test w/o any importance; could be a Blink LED as well. Of course I’m aware that the button could command the LED installed on the Arduino pin directly and not through virtual pin. I tried to send into Arduino the state of app. button because I need to test the way virtual pins are working; I need to learn.
I don’t understand why I received compile error message! What it’s wrong?
Thanks
Are you using IDE 1.6.7 as functions need to be in a specific order now?
I think your problem though is that you are trying to call a Blynk function within your scriepin function.
Fixed your sketch, this compiles ok.
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "..........................";
const int pin=4;
void setup()
{
Serial.begin(9600);
Blynk.begin(auth, "...........................", "................");
pinMode(pin, OUTPUT);
}
//void scriepin()
//{
BLYNK_WRITE(3) //; //in Blynk App a push button was created for virtual pin 3:
{
int i=param.asInt();
if (i==1) {
//HIGH
digitalWrite(pin,HIGH);
} else {
//LOW
digitalWrite(pin,LOW);
}
}
//}
void loop()
{
Blynk.run();
//scriepin(); // a LED was installed on PIN4 through a 1K resistor
}