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/