init

.gitignore

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+.pio

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+lib_deps = knolleary/PubSubClient@^2.8

src/main.ino

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+#include "Arduino.h"
+#include <WiFiMulti.h>
+#include <Wire.h> //Import the required libraries
+#include <PubSubClient.h>
+
+
+
+#define DISCHARGE_PIN 23
+#define CHARGE_PIN 5
+#define MEASURING_PIN 36
+#define RESISTOR_VALUE 1e6
+#define DEVICE "ESP32"
+#define WIFI_SSID "SSID_HERE"         // Network Name
+#define WIFI_PASSWORD "PASSWORD_HERE" // Network Password
+#define MQTT_SERVER "test.mosquitto.org"
+#define MQTT_PORT 1883
+#define MQTT_SUBSCRIBE_PUMP "plant/1/pump"
+
+
+
+WiFiMulti wifiMulti;
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+void setup()
+{
+  // initialize LED digital pin as an output.
+  Serial.begin(9600);
+
+  pinMode(CHARGE_PIN, OUTPUT);
+  digitalWrite(CHARGE_PIN, LOW);
+
+  setup_wifi();
+  setup_mqtt();
+
+}
+
+// =============== LOOP ============ 
+void loop()
+{
+  float cap;
+    setup_wifi();
+    setup_mqtt();
+
+
+  cap = capacitance(DISCHARGE_PIN, CHARGE_PIN, MEASURING_PIN);
+
+}
+// =============== LOOP END ============ 
+
+
+float capacitance(int discharge_pin, int charge_pin, int measuring_pin) {
+  unsigned int start_time, elapsed_time;
+  float nanoFarads;
+
+  // discharge:
+  digitalWrite(charge_pin, LOW);
+  pinMode(discharge_pin, OUTPUT);
+  digitalWrite(discharge_pin, LOW);
+  // wait until the capacitor is fully discharged
+  while(analogRead(measuring_pin) > 0) {
+    //Serial.println(analogRead(measuring_pin));
+    //Serial.print("discharging\n");
+  };
+  // stop discharging
+  pinMode(discharge_pin, INPUT);
+
+  // Start charging
+  digitalWrite(charge_pin, HIGH);
+  start_time = millis();
+  while(analogRead(measuring_pin) < 2588){// 2588 is 63.2% of 4096, which corresponds to full-scale voltage
+  }
+
+  elapsed_time = millis() - start_time;
+  nanoFarads = ((float)elapsed_time / RESISTOR_VALUE) * 1e6;
+  Serial.println((long) nanoFarads);
+  delay(1000);
+
+  return nanoFarads;
+};
+
+void setup_wifi() {
+  WiFi.mode(WIFI_STA); // Setup wifi connection
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+
+  Serial.print("Connecting to wifi"); // Connect to WiFi
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(100);
+  }
+  Serial.print("Connected to ");
+  Serial.print(WIFI_SSID);
+  Serial.println("  Successfully");
+  Serial.print(WiFi.localIP());
+  Serial.println("  isn the local IP");
+}
+
+void setup_mqtt() {
+  client.setServer(MQTT_SERVER, MQTT_PORT);
+  client.setCallback(callback);
+}
+
+void callback(char *topic, byte *message, unsigned int length) {
+  Serial.print("Message arrived on topic: ");
+  Serial.print(topic);
+  Serial.print(". Message: ");
+  String messageTemp;
+
+  for (int i = 0; i < length; i++) {
+    Serial.print((char)message[i]);
+    messageTemp += (char)message[i];
+  }
+  Serial.println();
+
+  if (String(topic) == MQTT_SUBSCRIBE_PUMP) {
+    Serial.print("Starting Pump for: ");
+  }
+}
+
+void reconnect_mqtt() {
+  // Loop until we're reconnected
+  while (!client.connected()) {
+    Serial.print("Attempting MQTT connection...");
+    // Attempt to connect
+    if (client.connect("ESP32-1")) {
+      Serial.println("connected");
+      // Subscribe
+      client.subscribe(MQTT_SUBSCRIBE_PUMP);
+    } else {
+      Serial.print("failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
+void publish_mqtt(const char *topic, const char *sensor, float value) {
+  char buffer[40];
+  sprintf(buffer, "plant1 %s=%.0f", sensor, value);
+  Serial.print("Publishing ");
+  Serial.println(buffer);
+  client.publish(topic, buffer);
+}
+
+

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html