tmp007.c

#include <Wire.h>
#include "Adafruit_TMP007.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "nvs.h"

Adafruit_TMP007 tmp007;

nvs_handle nvs;
esp_err_t err;
  
void setup() { 
  Serial.begin(9600);
  Serial.println("Adafruit TMP007 example");
  // you can also use tmp007.begin(TMP007_CFG_1SAMPLE) or 2SAMPLE/4SAMPLE/8SAMPLE to have
  // lower precision, higher rate sampling. default is TMP007_CFG_16SAMPLE which takes
  // 4 seconds per reading (16 samples)
  if (!tmp007.begin(TMP007_CFG_4SAMPLE)) {
    Serial.println("No sensor found");
    while (1);
  }

  nvs_flash_init();
  Serial.println("Opening Non-Volatile Storage (NVS) ... ");
  err = nvs_open("irtemp", NVS_READWRITE, &nvs);
  if (err != ESP_OK) {
      Serial.printf("Error (%d) opening NVS!\n", err);
  } else {
    Serial.println("Done");
  }
}

uint32_t last_temp_update = 0;
float buffer[16];
int buf_idx = 0;
int nvs_idx = 0;

void saveTemperature(float temp) {
  Serial.print("buf_idx=");Serial.println(buf_idx);
  if (buf_idx % 16 == 15) {
    String stridx("i");
    stridx += nvs_idx;
    Serial.print("saving buffer to nvs ");
    Serial.println(stridx);
    err = nvs_set_blob(nvs, stridx.c_str(), (const void*) buffer, sizeof(float) * 16);
    if (err != ESP_OK) {
      Serial.print("nvs set returned error %d");Serial.println(err);
    }
    nvs_idx++;
  }
  buffer[buf_idx % 16] = temp;
  buf_idx++;
}

void loop() {
  uint32_t now = millis();
  if (now - last_temp_update > 1000) {
    last_temp_update = now;
    float objt = tmp007.readObjTempC();
    float diet = tmp007.readDieTempC();
    Serial.print("Object Temperature: "); Serial.print(objt); Serial.println("*C");
    Serial.print("Die Temperature: "); Serial.print(diet); Serial.println("*C");  
    saveTemperature(objt);
  }
  delay(1000);
}