Category: Microcontrollers

#include <ESP8266WiFi.h>

void setup()
{
  Serial.begin(115200);
  Serial.println();

  Serial.print("Setting soft-AP ... ");
  boolean result = WiFi.softAP("ESPsoftAP_01", "pass-to-soft-AP");
  if(result == true)
  {
    Serial.println("Ready");
  }
  else
  {
    Serial.println("Failed!");
  }
}

void loop()
{
  Serial.printf("Stations connected = %d\n", WiFi.softAPgetStationNum());
  delay(3000);
}

Access Point SSID name and password

boolean result = WiFi.softAP("ESPsoftAP_01", "pass-to-soft-AP");

edit the above bold word with your own SSID name and password. Save and recompile your code again.

EasyEDA Microcontrollers PCB Design

Tutorial To Create a New Symbol

Post author By editor
Post date October 7, 2021

ESP32 ESP8266 (ESP-01/01S) Microcontrollers

Storing Data SPIFFS

Post author By editor
Post date September 29, 2021

Requirements

DHT11 Temperature and Humidity
USB to UART ESP01 Programmer
ESP8266 ESP01/01s (512KB / 1 Mbyte)
File System Uploader plug-in installed

Circuity

Code

#include "FS.h"
#include "DHT.h"

#define DHTPIN 2 // the digital pin we are connected to
#define DHTTYPE DHT11 // define type of DHT sensor we are using

DHT dht(DHTPIN, DHTTYPE); // create DHT object

void setup() {
  Serial.begin(115200);
  dht.begin(); // intialize DHT object
  
  // always use this to "mount" the filesystem
  bool ok = SPIFFS.begin();
  if (ok) {
    Serial.println("SPIFFS initialized successfully");
  }
  else{
    Serial.println("SPIFFS intialization error");
  }
  
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);
  //read temperature as Celcius
  float t = dht.readTemperature(); 
  
  // Check if any reads failed and exit early (to try again).
  if (isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  //open log.txt file 
  File f = SPIFFS.open("/log.txt", "a");
  if (!f) {
    Serial.println("file open failed");
  }
  // save temperature reading
  f.print(t);
  f.println("deg C");
  //close file
  f.close();
  delay(8000);
}

Resources

https://arduino-esp8266.readthedocs.io/en/latest/filesystem.html

https://thebigpotatoe.github.io/Effortless-SPIFFS/

https://www.arduino.cc/reference/en/libraries/effortless-spiffs/

ESP8266 (ESP-01/01S) Microcontrollers

Troubleshooting ESP8266

Post author By editor
Post date September 29, 2021

The board stops working when things are connected to some pins

There are some pins on the ESP8266 board that are used for reset functions and for boot mode functions. Therefore, ensure that:

CH_PD (EN) is always pulled high because it will disable the ESP8266 when it is pulled low
RST is always pulled high because it will disable the ESP8266 when it is pulled low
GPIO 0 is pulled high during power up/reset for the user program to run, otherwise the module will enter bootloader mode. It is normally pulled high by the red LED
GPIO 2 is pulled high on power up/reset
GPIO 15 is pulled low on power up/reset