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Moderator: igrr

User avatar
By JerryESPN
#52595 As promised in the post before, here´s the Sketch...and a question:

Code: Select all#include <DHT.h>
#include <ESP8266WiFi.h>

// replace with your channel’s thingspeak API key,
String apiKey = "sdfasdfasdfasdfasdf";
const char* ssid = "asdfasdf";
const char* password = "1231231231123123";

const char* server = "api.thingspeak.com";
#define DHTPIN 2 // what pin we’re connected to

DHT dht(DHTPIN, DHT11,15);
WiFiClient client;

// Required for LIGHT_SLEEP_T delay mode
extern "C" {
#include "user_interface.h"
}

void fpm_wakup_cb_func1(void)  {
wifi_fpm_close(); // disable force sleep function
}

void sleepNow(int MILI) {
// Serial.println("Going to sleep...");
wifi_fpm_set_sleep_type(LIGHT_SLEEP_T); // light sleep
wifi_fpm_open(); // enable force sleep
wifi_fpm_set_wakeup_cb(fpm_wakup_cb_func1); // Set wakeup callback
wifi_fpm_do_sleep(MILI * 1000);
delay(MILI + 10);
}

void setup() {
Serial.begin(115200);
delay(10);
dht.begin();

WiFi.mode(WIFI_STA); // Station Mode
WiFi.begin(ssid, password);

Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}

Serial.println("");
Serial.println("WiFi connected");

}

void loop() {

sleepNow(180000); //  ca. 4 Min.???

float h = dht.readHumidity();
float t = dht.readTemperature();
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}

if (client.connect(server,80)) { // "184.106.153.149" or api.thingspeak.com
String postStr = apiKey;
postStr +="&field1=";
postStr += String(t);
postStr +="&field2=";
postStr += String(h);
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);

Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" degrees Celcius Humidity: ");
Serial.print(h);
Serial.println("% send to Thingspeak");
}
client.stop();

Serial.println("Waiting…");
// thingspeak needs minimum 15 sec delay between updates

//delay(900000);

}


Question:

Code: Select allwifi_fpm_do_sleep(MILI * 1000);


For my unterstanding, sleepNow(180) would mean an delay of 3 Minutes. In fact, 180000 actually is about 4 Minutes? At least that´s the time Thingspeak receives an update from DHT/ESP.

What to do to get an Delay of 15 Min. or more? With higher MILI-Values the script stops working.

Thanks!

PS: Script running...will see how long it lasts :)
User avatar
By lethe
#52605
JerryESPN wrote:Concerning the linear regulator: I´ve thought, efficiency with LDs is high if difference between input and output voltages is small.

Yes, by "efficient" I meant lower quiescence current & dropout voltage.

I´m using an 3,7V LiPo on 3,3V output, so i should be fine?

Actually a fully charged LiPo will have 4.2V, but will quickly drop below 4V. The 78% efficiency stated in my previous post was calculated based on 4.2V input.
However here's another reason why a 1117 LDO won't do for this application: it has a dropout voltage of 1.2V, so with 3.3V output, the input voltage should be at least 4.5V, which you'll never get with a 1S LiPo.
The XC6203 has a dropout voltage of 150mV, so it will be fine down to 3.45V input, at which point the LiPo should be about 80% discharged (below 3.45V it won't really regulate anymore but the output voltage will just be a couple of mV lower than the input).

I´ll give the XC6203 a shot. Hard to get, only found 1 chinese Trader offering delivery to Europe on eBay. So i´ll report back at the earliest in October ;).

On aliexpress there are plenty of offers, but all from china as well of course...
There are also quite a few alternatives to the XC6203 (pretty much any modern LDO will be better than a 1117 or 7803), some of them are mentioned on other battery discussions on this forum...