From a84106477f3adb0e1919d0b6be8a03ac7ef1646b Mon Sep 17 00:00:00 2001
From: Sietse Jonker <sietse.jonker@hva.nl>
Date: Fri, 9 Feb 2024 16:29:46 +0100
Subject: [PATCH] adds code for node

---
 arduino/node-code.ino | 74 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 arduino/node-code.ino

diff --git a/arduino/node-code.ino b/arduino/node-code.ino
new file mode 100644
index 0000000..7f989d1
--- /dev/null
+++ b/arduino/node-code.ino
@@ -0,0 +1,74 @@
+// Sietse Jonker 
+// 09/02/2024
+
+#include <Wire.h>         // Only needed for Arduino 1.6.5 and earlier
+#include "SSD1306Wire.h"  // legacy: #include "SSD1306.h"
+#include "Adafruit_SGP30.h"
+#include "images.h"
+#include "DHT.h"
+
+#define DHTPIN 7
+
+#define DHTTYPE DHT11
+
+SSD1306Wire display(0x3c, SDA, SCL);  // ADDRESS, SDA, SCL  -  SDA and SCL usually populate automatically based on your board's pins_arduino.h e.g. https://github.com/esp8266/Arduino/blob/master/variants/nodemcu/pins_arduino.h
+DHT dht(DHTPIN, DHTTYPE);
+Adafruit_SGP30 sgp;
+
+uint32_t getAbsoluteHumidity(float temperature, float humidity) {
+  // approximation formula from Sensirion SGP30 Driver Integration chapter 3.15
+  const float absoluteHumidity = 216.7f * ((humidity / 100.0f) * 6.112f * exp((17.62f * temperature) / (243.12f + temperature)) / (273.15f + temperature));  // [g/m^3]
+  const uint32_t absoluteHumidityScaled = static_cast<uint32_t>(1000.0f * absoluteHumidity);                                                                 // [mg/m^3]
+  return absoluteHumidityScaled;
+}
+
+void setup() {
+  Serial.begin(115200);
+
+  // Initialising the UI will init the display too.
+  display.init();
+  dht.begin();
+
+  display.flipScreenVertically();
+
+  Serial.println("SGP30 test");
+
+  if (!sgp.begin()) {
+    Serial.println("Sensor not found :(");
+    while (1)
+      ;
+  }
+  Serial.print("Found SGP30 serial #");
+  Serial.print(sgp.serialnumber[0], HEX);
+  Serial.print(sgp.serialnumber[1], HEX);
+  Serial.println(sgp.serialnumber[2], HEX);
+}
+
+void loop() {
+  display.clear();
+
+  display.setFont(ArialMT_Plain_24);
+  display.setTextAlignment(TEXT_ALIGN_LEFT);
+  display.drawString(0, 0, String(sgp.eCO2) + "ppm");
+  display.drawString(0, 32, String(dht.readTemperature()));
+
+  display.display();
+
+  if (!sgp.IAQmeasure()) {
+    Serial.println("Measurement failed");
+    return;
+  }
+
+  uint16_t TVOC_base, eCO2_base;
+  if (!sgp.getIAQBaseline(&eCO2_base, &TVOC_base)) {
+    Serial.println("Failed to get baseline readings");
+    return;
+  }
+
+
+  Serial.print("eCO2 ");
+  Serial.print(sgp.eCO2);
+  Serial.println(" ppm");
+
+  delay(1000);
+}