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--- iothings:proiecte:2022sric:voltmeter [2023/06/01 23:13]
eduard.olteanu1505
+++ iothings:proiecte:2022sric:voltmeter [2023/06/01 23:40] (current)
eduard.olteanu1505
@@ Line 51: / Line 51: @@
 </code>
-<code>
 Firebase connection:
+<code>
 /* Assign the api key (required) */
 config.api_key = API_KEY;
@@ Line 74: / Line 74: @@
 Firebase.reconnectWiFi(true);
 </code>
-===== Demo =====
+Voltage measurement:
-The main usecase of this project is to measure the voltage of batteries.
+<code>
+adc0 = ads.readADC_SingleEnded(0);
+delay(10);
+volts0 = ads.computeVolts(adc0);
+lcd.clear();
+lcd.setCursor(0, 0);
+lcd.print("ADC0:");
+lcd.print(adc0);
+lcd.setCursor(0, 1);
+lcd.print(volts0);
+lcd.print("V");
+</code>
+Storing the value in the database:
+<code>
+// read the state of the switch/button:
+currentState = digitalRead(BUTTON_PIN);
+if ((lastState == LOW && currentState == HIGH) && Firebase.ready() && signupOK) {
+  sendDataPrevMillis = millis();
+  Serial.print ("time: ");
+  Serial.println (sendDataPrevMillis);
+  entry_path = path + "/" + String(sendDataPrevMillis);
+  // Write an Float number on the database path test/float
+  if (Firebase.RTDB.setFloat(&fbdo, entry_path , volts0)) {
+    Serial.println("PASSED");
+    Serial.println("PATH: " + fbdo.dataPath());
+    Serial.println("TYPE: " + fbdo.dataType());
+  }
+  else {
+    Serial.println("FAILED");
+    Serial.println("REASON: " + fbdo.errorReason());
+  }
+}
+lastState = currentState;
+</code>
+We use millis to store the value in order not to overwrite already known values.
+==== Problems and Improvements ====
+  * One problem that I could not fix is the noise the ADS1115 is getting when reading, even if there is nothing measured the pin reads 0.9V, but that doesn't impact measurements.
+  * An improvement could be to add some other form of identification for the batteries when stored in the database.
+  * Another improvement could be to have a phone application that manages the database for the batteries and also that communicates with the ESP32.
+===== Results =====
+The main use-case of this project is to measure the voltage of batteries.
 {{ :iothings:proiecte:2022sric:20230601_225009.jpg ?700 |}}
@@ Line 85: / Line 131: @@
 Also, if the button is pressed the value is stored in the database.
 {{ :iothings:proiecte:2022sric:database_batteries.png?700 |}}
-===== Conclusion =====
 ===== Bibliography=====
   * [[https://ocw.cs.pub.ro/courses/iothings/laboratoare/2022/lab4]]
   * [[https://how2electronics.com/how-to-use-ads1115-16-bit-adc-module-with-esp32/]]
+  * [[https://github.com/mobizt/Firebase-ESP-Client]]
+  * [[https://github.com/adafruit/Adafruit_ADS1X15]]