Requirements
ESP8266 ESP-01/ESP-01S
Arduino Sketch / Code
#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.
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/
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
Categories
NodeMCU (0.9)
Flash Size : 4MB / 32Mbit
Pin Out