commit 1e257669de536be1ee6fc5b91fbba5e49120f2f9
Author: Robert Marshall <rob@robware.uk>
Date:   Fri Jul 27 22:49:10 2018 +0100

    Initial commit

diff --git a/.vscode/arduino.json b/.vscode/arduino.json
new file mode 100644
index 0000000..0981416
--- /dev/null
+++ b/.vscode/arduino.json
@@ -0,0 +1,6 @@
+{
+    "port": "COM4",
+    "board": "esp8266:esp8266:d1_mini",
+    "configuration": "CpuFrequency=80,FlashSize=4M1M,LwIPVariant=v2mss536,Debug=Disabled,DebugLevel=None____,UploadSpeed=921600",
+    "sketch": "monitor.ino"
+}
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diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..9483722
--- /dev/null
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,26 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "/home/rob/Arduino/libraries/Adafruit_ADS1X15",
+                "/home/rob/.arduino15/packages/esp8266/tools/**",
+                "/home/rob/.arduino15/packages/esp8266/hardware/esp8266/2.4.0/**",
+                "/home/rob/Apps/arduino-1.8.5/tools/**",
+                "/home/rob/Apps/arduino-1.8.5/hardware/arduino/avr/**"
+            ],
+            "intelliSenseMode": "clang-x64",
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17"
+        },
+        {
+            "name": "Win32",
+            "includePath": [
+                "C:\\Users\\Rob\\AppData\\Local\\Arduino15\\packages\\esp8266\\tools\\**",
+                "C:\\Users\\Rob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.4.0\\**"
+            ]
+        }
+    ],
+    "version": 4
+}
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diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..5055ffc
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,45 @@
+{
+	"files.associations": {
+		"array": "cpp",
+		"hash_map": "cpp",
+		"initializer_list": "cpp",
+		"utility": "cpp",
+		"*.tcc": "cpp",
+		"cctype": "cpp",
+		"clocale": "cpp",
+		"cmath": "cpp",
+		"cstdarg": "cpp",
+		"cstddef": "cpp",
+		"cstdint": "cpp",
+		"cstdio": "cpp",
+		"cstdlib": "cpp",
+		"cstring": "cpp",
+		"ctime": "cpp",
+		"cwchar": "cpp",
+		"cwctype": "cpp",
+		"deque": "cpp",
+		"list": "cpp",
+		"unordered_map": "cpp",
+		"vector": "cpp",
+		"exception": "cpp",
+		"fstream": "cpp",
+		"functional": "cpp",
+		"iomanip": "cpp",
+		"iosfwd": "cpp",
+		"iostream": "cpp",
+		"istream": "cpp",
+		"limits": "cpp",
+		"memory": "cpp",
+		"new": "cpp",
+		"ostream": "cpp",
+		"numeric": "cpp",
+		"sstream": "cpp",
+		"stdexcept": "cpp",
+		"streambuf": "cpp",
+		"system_error": "cpp",
+		"cinttypes": "cpp",
+		"type_traits": "cpp",
+		"tuple": "cpp",
+		"typeinfo": "cpp"
+	}
+}
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diff --git a/monitor.ino b/monitor.ino
new file mode 100644
index 0000000..4f5a1ee
--- /dev/null
+++ b/monitor.ino
@@ -0,0 +1,132 @@
+// see here: https://forum.arduino.cc/index.php?topic=336012.msg2643184#msg2643184 and https://scidle.com/how-to-use-a-ph-sensor-with-arduino/
+
+#include <Wire.h>
+#include <Adafruit_ADS1015.h>
+#include <PubSubClient.h>
+#include <ESP8266WiFi.h>
+#include <OneWire.h>
+#include <DallasTemperature.h>
+
+#define MQTT_SERVER "192.168.1.3"
+#define SSID "GCHQ Surveillance Van"
+#define PASSWORD "cocklol."
+#define PH_TOPIC "/home/sensors/fishtank/ph"
+#define TEMPERATURE_TOPIC "/home/sensors/fishtank/temperature"
+#define TEMPERATURE_PIN D5
+
+#define PH_7_VOLTAGE 2.5
+#define PH_4_VOLTAGE 3.04
+
+#define VOLTAGE_OFFSET 0.03
+
+void mqttCallback(char *topic, byte *payload, unsigned int length);
+
+Adafruit_ADS1115 ads;
+OneWire oneWire(TEMPERATURE_PIN);
+DallasTemperature DS18B20(&oneWire);
+WiFiClient wifiClient;
+PubSubClient client = PubSubClient(MQTT_SERVER, 1883, mqttCallback, wifiClient);
+
+float pHStep = (PH_7_VOLTAGE - PH_4_VOLTAGE) / 3;
+
+void waitForWiFi() {
+	if (WiFi.status() == WL_CONNECTED)
+		return;
+	Serial.println("Reconnecting WiFi...");
+	while (WiFi.status() != WL_CONNECTED)
+	{
+		delay(100);
+	}
+	Serial.println("Connected WiFi!");
+}
+
+void waitForMQTT() {
+	if (client.connected())
+		return;
+	Serial.println("Reconnecting MQTT...");
+	while (!client.connected())
+	{
+		if (!client.connect(PH_TOPIC))
+			delay(50);
+	}
+	Serial.println("Connected MQTT!");
+}
+
+void reconnect() {
+	waitForWiFi();
+	waitForMQTT();
+}
+
+void setup() {
+	Serial.begin(115200);
+
+	ads.setGain(GAIN_TWOTHIRDS);
+	ads.begin();
+
+	pinMode(TEMPERATURE_PIN, INPUT_PULLUP);
+	DS18B20.begin();
+
+	WiFi.begin(SSID, PASSWORD);
+	reconnect();
+}
+
+float mapfloat(float x, float in_min, float in_max, float out_min, float out_max) {
+	return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
+
+float readpH() {
+	Serial.println("Reading pH...");
+	int sum = 0;
+	const int readCount = 10;
+
+	for (int i = 0; i < readCount; i++)
+	{
+		sum += ads.readADC_SingleEnded(0);
+		delay(10);
+	}
+
+	float averageRead = float(sum) / readCount;
+	Serial.print("Average value: ");
+	Serial.println(averageRead);
+
+	float voltage = 6.144 / 32768.0 * averageRead;
+	voltage -= VOLTAGE_OFFSET;
+	Serial.println(voltage);
+	float pH = 7 - ((PH_7_VOLTAGE - voltage) / pHStep);
+	return pH;
+}
+
+void publishpH() {
+	float pH = readpH();
+	String pHString(pH, 2);
+	Serial.println(pHString);
+	client.publish(PH_TOPIC, pHString.c_str(), true);
+}
+
+void publishTemperature() {
+	DS18B20.requestTemperatures();
+	float temperature = DS18B20.getTempCByIndex(0);
+	String temperatureString(temperature, 2);
+	Serial.println(temperatureString);
+	client.publish(TEMPERATURE_TOPIC, temperatureString.c_str(), true);
+}
+
+void loop() {
+	long startTick = millis();
+	reconnect();
+	client.loop();
+
+	publishpH();
+	publishTemperature();
+
+	delay(60000 - (millis() - startTick));
+}
+
+void mqttCallback(char *topic, byte *payload, unsigned int length) {
+	Serial.print("Got payload: ");
+	for (int i = 0; i < length; i++)
+	{
+		Serial.print((char)payload[i]);
+	}
+	Serial.println();
+}
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