New combined demo showing most non I2C input sensors.

examples/Combined_Demo/Combined_Demo.ino

@@ -0,0 +1,142 @@
+// Combined Demo by Marc MERLIN <marc_soft@merlins.org>
+
+#include "Arduino_SensorKit.h"
+
+uint8_t button = 4;
+uint8_t led = 6;
+uint8_t pot = A0;
+uint8_t mic = A2;
+uint8_t light = A3;
+
+// From https://playground.arduino.cc/Main/I2cScanner/
+// learn more about I2C here
+// https://www.seeedstudio.com/blog/2019/09/25/uart-vs-i2c-vs-spi-communication-protocols-and-uses/
+// Scanner from https://github.com/RobTillaart/Arduino/blob/master/sketches/MultiSpeedI2CScanner/MultiSpeedI2CScanner.ino
+// 30038	25	0x19		V	V	V	V	V	V	V	V
+// 30133	60	0x3C		V	V	V	V	V	V	V	V
+// 30296	119	0x77		V	V	V	V	V	V	V	V
+void i2c_scan() {
+  uint8_t error, address, nDevices;
+
+  Wire.begin();
+  Serial.println("Scanning...");
+
+  nDevices = 0;
+  for(address = 1; address < 127; address++ )
+  {
+    //Serial.println("I2C scan");
+    // The i2c_scanner uses the return value of
+    // the Write.endTransmisstion to see if
+    // a device did acknowledge to the address.
+    Wire.beginTransmission(address);
+    error = Wire.endTransmission();
+
+    if (error == 0)
+    {
+      Serial.print("I2C device found at address 0x");
+      if (address<16)
+        Serial.print("0");
+      Serial.print(address,HEX);
+      Serial.println("  !");
+
+      nDevices++;
+    }
+    else if (error==4)
+    {
+      Serial.print("Unknown error at address 0x");
+      if (address<16)
+        Serial.print("0");
+      Serial.println(address,HEX);
+    }    
+  }
+  if (nDevices == 0)
+    Serial.println("No I2C devices found\n");
+  else
+    Serial.println("done\n");
+}
+
+void setup() {
+  Serial.begin(115200);
+  // Running scan stops the OLED from working
+  //i2c_scan();
+
+  pinMode(mic , INPUT);
+  pinMode(light , INPUT);
+
+  pinMode(button , INPUT);
+  pinMode(led, OUTPUT);
+  digitalWrite(led, LOW);
+
+  Environment.begin();
+
+  Oled.begin();
+  Oled.setFlipMode(true);
+
+  // Enabling any of those 2 stops the OLED from working
+  //Accelerometer.begin();
+  //Pressure.begin();
+}
+
+void loop() {
+
+  Oled.setFont(u8x8_font_amstrad_cpc_extended_r); 
+
+  #if 0
+  Oled.setCursor(0, 0);
+  Oled.print("x:"); 
+  Oled.print(Accelerometer.readX()); 
+  Oled.print("  ");
+  Oled.print("y:"); 
+  Oled.print(Accelerometer.readY());        
+  Oled.print("  ");
+  Oled.print("z:"); 
+  Oled.print(Accelerometer.readZ());
+  // Similar problem with pressure sensor
+  Oled.print(Pressure.readAltitude());
+  #endif
+
+  Oled.setCursor(0, 0);
+  Oled.print("But:"); 
+  if (digitalRead(button)) {
+    digitalWrite(led, HIGH);
+    Oled.print("1"); 
+  } else {
+    digitalWrite(led, LOW);
+    Oled.print("0"); 
+  }
+
+  // https://github.com/olikraus/u8g2/wiki/u8x8reference#print
+  // looks like we need an offset of 9 for a font of 8
+  // if the offset is wrong, the text gets displayed on
+  // the wrong line
+  uint16_t pot_value = analogRead(pot);
+  Oled.setCursor(0, 9);
+  Oled.print("Pot: ");
+  Oled.print(pot_value);
+  Oled.print("   ");
+
+  uint16_t mic_value = analogRead(mic);
+  Oled.setCursor(0, 18);
+  Oled.print("Mic: ");
+  Oled.print(mic_value);
+  Oled.print("   ");
+
+  uint16_t light_value = analogRead(light);
+  Oled.setCursor(0, 27);
+  Oled.print("Light: ");
+  Oled.print(light_value);
+  Oled.print("   ");
+
+  Oled.setCursor(0, 45);
+  Oled.print("Temp:");
+  Oled.print(Environment.readTemperature());
+  Oled.print("C");
+
+  Oled.setCursor(0, 54);
+  Oled.print("Hum: ");
+  Oled.print(Environment.readHumidity());
+  Oled.print("%");
+
+  Oled.refreshDisplay();
+  delay(100);
+}