I want to use Blynk to record temperature from the outdoor station made of esp8266 , using Arduino IDE for the code creation.
I want to use superchart widget.
I wanted to test it first so I created a code that sends sin(x) readings into the superchart .
I am using the free plan and I thought there is a possiblility of keeping one week of data. In virtual pin the re is a switch that activates historical data.
However when I connect the blunk app I see the sin(x) function being displayed up to a point and then after 20+ readings There is a glitch and the sin(x) gets drawn from the start. If I close the blunk app and reopen it I do not see data that was transfered to the virtual pin when the blynk app was closed.
Is it possible to store history and have it displayed o n the chart each time I open the blunk up for the whole perion arduino sketch was started.
#define BLYNK_TEMPLATE_ID "TMPL4dzCelDj6"
#define BLYNK_TEMPLATE_NAME "BlynkChart"
#define BLYNK_AUTH_TOKEN "UD9b3PXwKRy6WmKkDKvSN4UTrcjoNzCI"
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <math.h>
char ssid[] = "Dziubym";
char pass[] = "Mikigosia1";
BlynkTimer timer; // Timer to send data periodically
float angle = 0; // Angle in radians
void sendSinToBlynk() {
float value = sin(angle);
Blynk.virtualWrite(V0, value); // Send value to V0
Serial.println(value);
angle += 0.1; // Increment angle
if (angle >= 2 * PI) {
angle = 0;
}
}
void setup() {
Serial.begin(9600);
Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
// Set up the timer to send sine value every 100ms
timer.setInterval(1000L, sendSinToBlynk);
}
void loop() {
Blynk.run();
timer.run(); // Needed to run the timer
}
