Hello all,
I'm having a very weird issue using the strcat function on an ESP8266 with the Arduino IDE. Hoping you all can help me figure out what's going on.
What I am currently trying to do is measure the temperature from a SHT31 temperature sensor, then store the values (up to 60 measurements) in two different strings. One string is separated by underscores, the other is separated by commas. Code below:
#include <Adafruit_SHT31.h>
#include <RTClib.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
//#include <SPI.h>
//#include <SD.h>
Adafruit_SHT31 sht31;
RTC_PCF8523 rtc;
float SHTtemp = 0.0;
char buffer[10];
char tt2[360];
char SDstring[52] = "";
void setup() {
// put your setup code here, to run once:
pinMode(A0, INPUT);
WiFi.disconnect();
Serial.begin(115200);
Serial.println("Hello!");
if (!sht31.begin(0x44)) {
Serial.println("Failed to find sht31");
while (1)
delay(1);
}
}
void loop() {
sht31Temperature();
delay(500);
}
void sht31Temperature () {
SHTtemp = sht31.readTemperature();
Serial.print("float temp: ");
Serial.println(SHTtemp);
char *SHTtemp_char = dtostrf(SHTtemp, 4, 2, buffer);
strcat(tt2, SHTtemp_char);
strcat(tt2, "_");
Serial.print("temp char: ");
Serial.println(tt2);
// strcat(SDstring, dtostrf(SHTtemp, 4, 2, buffer);
strcat(SDstring, buffer);
strcat(SDstring, ",");
Serial.print("sd string: ");
Serial.println(SDstring);
}
When only creating one string, the code works great. Serial output is as expected. As soon as I try to create another string with the same values (either using the dtostrf or the buffer method above) it will run successfully for a few seconds then the strings seem to get "jumbled up." There are some commas in the string that should have only underscores and vice versa. A quick screenshot of the serial output is below. You can see where it starts to mess up. Am I making a dumb mistake or is there something weird going wrong??
Thank you!!
