Blink notify in two determinated hour

Hi blinkers, sorry for my english!
I have a problem with my arduino project, i do a sketch with a ds120bs probe and i want a notify from blynk at 8.15 and 18.15 if the temperature is higher to 30°!!
I try and try but i am not able!
My problem is notify only at two time not always!
Thank you


Add the RTC widget, get the time and make a conditional statement that if the time is 8.15 && temp is > 30 degrees, do the notify.

Or use the eventor widget, that would work too I think

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Agree, Eventor will do. Not sure how to tie time with temperature threshold without coding, though.

code removed

My example didn’t work when testing it myself for some reason, so I removed it. :thinking: :open_mouth:

One m-f wrong placed ; :rage: This should work better :slight_smile:

From Blynk lib:

BlynkTimer timer;
WidgetRTC rtc;

Simple function:

void checkTime() {
  if (hour() == 8 && minute() == 15) {
    checkTemp() {
      if (temp >= 30) {
  if (hour() == 18 && minute() == 15) {

A timer running every 30 s:

timer.setInterval(30000L, checkTime);

A rtc.begin(); is needed in the void setup()

sudo su
set CodeFactory=distans
redirect CodeBeggers>>CodeFactory

@Gunner, I need to work on my Linux skills

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Pfff…!! I Needed to practice on how to use TimeLib for my own projects :slight_smile:

My Padawan @Gunner would have used sudo su - instead! :crossed_swords:

“I don’t like Linux. It’s coarse and rough and irritating and it gets everywhere.”

Please format your code so it’s readable:

Don’t poll your DS18B20 sensor once every second. You will most likely get disconnected. I’ve written about this numerous times, use the search function! :slight_smile:

Ok thank you! I format my code and repost!

Not to mention it will kill in it some days. It writes to eeprom on every read and has 50k write cycles :stuck_out_tongue:

Sorry guys, i try only to notify but it doesn t work! and i don t have use the RTC:unamused:

#include <Blynk.h>
BlynkTimer timer;
#include <Time.h>
#include <TimeLib.h>

#define BLYNK_PRINT Serial

#include <SPI.h>
#include <Ethernet.h>
#include <BlynkSimpleEthernet.h>

char auth[] = "bdd2d8501c5b4583b65ae96aed132821";

#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 2 // DS18B20 on arduino pin2 corresponds to D4 on physical board
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);

#define W5100_CS  10
#define SDCARD_CS 4

float temp;

void setup()

  digitalWrite(SDCARD_CS, HIGH); // Deselect the SD card

  timer.setInterval(1000L, getSendData);

void loop()
{; // Initiates SimpleTimer;
void getSendData()
  temp = DS18B20.getTempCByIndex(0);
  Blynk.virtualWrite(10, temp); //virtual pin V10
void notifyTemp()
  if (temp >= 20.00) 
      Blynk.notify("Temperatura elevata");

Fett, where did you get this info from?
why should it write to eeprom with every read cycle?
i never heard / read such information on the net…

Might have to take back that statement!
Can’t find my source where I read it once nor ca I find the corresponding info in the datasheet…
There is a 50k write limit. However it seems that you only write to eeprom if you change parameters like temp high low warning and configurations.

I remember reading the statement above when someone else was trying to read a ds18b20 very frequently. Something about it storing the previous read.

Read the datasheet more carefully :stuck_out_tongue:

The 50k write limit is MIN, no MAX is specified. I know people that have had these sensors running for years without problem, so the MAX value is probably much higher.

Being the self proclaimed Sensors Guy - It might have been in one of my previous posts :wink:

I tried to explain it in another post:

Or as stated in the datasheet:

To initiate a temperature measurement and A-to-D conversion, the master must issue a Convert T [44h] command. Following the conversion, the resulting thermal data is stored in the 2-byte temperature register in the scratchpad memory /.../

A separate command is then sent to the sensor asking it to reply with the value of its scratchpad. A quite sophisticated little sensor I think.


Add the RTC widget on your phone and include these libs in the code:

#include <TimeLib.h>
#include <WidgetRTC.h>


BlynkTimer timer;
WidgetRTC rtc;

In setup, start the RTC after Blynk.begin() (I think):

while (Blynk.connect() == false) { // Wait until connected

I guess you didn’t use the search function OR read my reply! :stuck_out_tongue: :wink:

This IS suicide: timer.setInterval(1000L, getSendData); Each time you do this the program has to wait aprox 0.8 seconds before it can continue!

You need to add a separate timer for notifyTemp()

Good luck!

tl;dr :persevere:

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