ESP8266 Community Forum

Hi all,

I have found this code online and can't find the author.
It works great for up to 30 minutes of sleep but I would like go an hour. Its in seconds
I did try and increase it from 1800 to 3600 seconds ( in code marked in Red ) but it never reboots and come out of sleep I guess.
Am I missing something? I know the timing is supposed to be in microseconds so if I changed it from 1800 ( in red ) seconds to 3.6e+6 and delete *1000000 from the deepsleep line ( in blue ) would that do anything?
There is a line in the code that has something with deepsleep but I have no idea what it references. ( Ok I think the Const in is the time designation )
Do I need to add a resistor to the reset circuit as well? I have been reading posts where people said it may be needed.
I appreciate any help or suggestions.
Thank you,

Here is the code:

/* DHT22 temperature and humidity data are uploaded to thingspeak using
* WeMOS ESP8266 MCU.
*
* Details: http://embedded-lab.com/blog/iot-temper ... ty-logger/
*/
#include <ESP8266WiFi.h>
#include <DHT.h>
#include "Math.h"
#define DHTTYPE DHT11
#define DHTPIN D2 // DHT22 data pin connects to D4

// Time to sleep (in seconds):
const int sleepTimeS = 1800;

DHT dht(DHTPIN, DHTTYPE, 11); // 11 works fine for ESP8266


float prevTemp = 0;
const char* server = "api.thingspeak.com";
String apiKey ="****************";
const char* MY_SSID = "*************";
const char* MY_PWD = "***************";
int sent = 0;
void setup() {
Serial.begin(115200);
dht.begin();
connectWifi();

}

void loop() {
float t1,humidity;
//char buffer[10];
humidity = dht.readHumidity(); // Read humidity (percent)
t1 = dht.readTemperature(true); // Read temperature as Fahrenheit
// Check if any reads failed and exit early (to try again).
if (isnan(humidity) || isnan(t1)) {
Serial.println("Failed to read from DHT sensor!");
return;
}


Serial.print(String(sent)+" Temperature: ");
Serial.println(t1);
Serial.print(String(sent)+" Humidity: ");
Serial.println(humidity);
sendTeperatureTS(t1, humidity);
ESP.deepSleep(sleepTimeS*1000000, WAKE_RF_DEFAULT); // Sleep for 60 seconds
}

void connectWifi()
{
Serial.print("Connecting to "+*MY_SSID);
WiFi.begin(MY_SSID, MY_PWD);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print(".");
}

Serial.println("");
Serial.println("Connected");
Serial.println("");
}//end connect

void sendTeperatureTS(float temp1, float temp2)
{
WiFiClient client;

if (client.connect(server, 80)) { // use ip 184.106.153.149 or api.thingspeak.com
Serial.println("WiFi Client connected ");

String postStr = apiKey;
postStr += "&field7=";
postStr += String(temp1);
postStr += "&field8=";
postStr += String(temp2);
postStr += "\r\n\r\n";

client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n");
client.print(postStr);
delay(1000);

}//end if
sent++;
client.stop();
}//end send

Ok I have tried a few different things and nothing helps getting it to sleep for 1 hour.
The current one get 30 minutes but that's it.
I'd like to extend that in order to save further on batteries.

That code should work ok. You will need to do two things:

- increase the value to 3600 for an hour of sleep
- connect the RST to GPIO16 using a Schotty diode. A wire works but will prevent auto flashing from working, and resistors will have mixed results depending on the state of your battery. A diode gets the most consistent results while still allowing you to auto flash your chip.

The the following topic: https://www.esp8266.com/viewtopic.php?p=73516

davydnorris wrote:That code should work ok. You will need to do two things:

- increase the value to 3600 for an hour of sleep
- connect the RST to GPIO16 using a Schotty diode. A wire works but will prevent auto flashing from working, and resistors will have mixed results depending on the state of your battery. A diode gets the most consistent results while still allowing you to auto flash your chip.

The the following topic: https://www.esp8266.com/viewtopic.php?p=73516

Thank you for the suggestions !
I have increased the value in the past without any luck. A half hour is all it would cycle at.
I jumped D0 and RST without a resistor or diode by the way and thought that had something to do with it.
I have a bunch of diodes left over from some recent projects and may have the type you mentioned.
That's a great idea by the way, what direction should the diode go?
I did change the script just before you posted and I may have gotten it to work.
I might have gotten the ESP to sleep for an hour by of course increasing the value to 3600 which I knew about but with 2 other changes and it was adding ul to the line below and spacing the asterisk:
ESP.deepSleep(sleepTimeS * 1000000ul, WAKE_RF_DEFAULT); // Sleep for 60 seconds

Thank you again - I'm going to let this code run overnight and if it works I'm going to reflash my 4 temp sensors over the weekend and hopefully the batteries will last a lot longer seeing I will have deep sleep working for an hour.
I'll add a diode to the sensor I'm testing with and to my 4 working sensors.