добавил ещё несколько примеров для I2C

libraries/SPI/examples/SDcard_readInfo/SDcard_readInfo.ino

@@ -1,9 +1,7 @@
 
 /*
   An SD card connected via SPI is used for this test. 
-  The example is taken from the arduino SD library.
+  The example uses the SD library, it must be installed first.
-
-  https://github.com/arduino-libraries/SD
 */
 
 #include <SPI.h>

libraries/Wire/examples/AHT10_terminal/AHT10.cpp

@@ -0,0 +1,59 @@
+#include <Arduino.h>
+#include <Wire.h>
+#include "AHT10.h"
+
+static const uint8_t AHT10_ADDR = 0x38;
+
+bool AHT10::begin() {
+  Wire.beginTransmission(AHT10_ADDR);
+  Wire.write(0xE1);
+  Wire.write(0x08);
+  Wire.write(0x00);
+  return Wire.endTransmission() == 0;
+}
+
+bool AHT10::reset() {
+  Wire.beginTransmission(AHT10_ADDR);
+  Wire.write(0xBA);
+  return Wire.endTransmission() == 0;
+}
+
+bool AHT10::measure(float *temp, float *hum) {
+  uint8_t data[6];
+  uint32_t d;
+
+  Wire.beginTransmission(AHT10_ADDR);
+  Wire.write(0xAC);
+  Wire.write(0x33);
+  Wire.write(0x00);
+  if (Wire.endTransmission())
+    return false;
+  delay(75);
+  if ((Wire.requestFrom(AHT10_ADDR, (uint8_t)6) != 6) || (Wire.readBytes(data, 6) != 6))
+    return false;
+  if (temp) {
+    d = ((uint32_t)(data[3] & 0x0F) << 16) | ((uint32_t)data[4] << 8) | data[5];
+    *temp = (float)d * 200 / 1048576 - 50;
+  }
+  if (hum) {
+    d = ((uint32_t)data[1] << 12) | ((uint32_t)data[2] << 4) | (data[3] >> 4);
+    *hum = (float)d * 100 / 1048576;
+  }
+  return true;
+}
+
+float AHT10::getTemperature() {
+  float result;
+
+  if (! measure(&result, NULL))
+    result = NAN;
+  return result;
+}
+
+float AHT10::getHumidity() {
+  float result;
+
+  if (! measure(NULL, &result))
+    result = NAN;
+  return result;
+}

libraries/Wire/examples/AHT10_terminal/AHT10.h

@@ -0,0 +1,15 @@
+#ifndef __AHT10_H
+#define __AHT10_H
+
+#include <Wire.h>
+
+class AHT10 {
+public:
+  static bool begin();
+  static bool reset();
+  static bool measure(float *temp, float *hum);
+  static float getTemperature();
+  static float getHumidity();
+};
+
+#endif

libraries/Wire/examples/AHT10_terminal/AHT10_terminal.ino

@@ -0,0 +1,32 @@
+
+/*
+  The AHT10 temperature and humidity sensor connected to I2C is used for this test.
+*/
+
+#include "AHT10.h"
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println();
+
+  Wire.begin();
+  if (! AHT10::begin()) {
+    Serial.println(F("AHT10 not detected!"));
+    Serial.flush();
+  }
+}
+
+void loop() {
+  float temp, hum;
+
+  delay(2000);
+  if (AHT10::measure(&temp, &hum)) {
+    Serial.print(F("Temperature is "));
+    Serial.print(temp);
+    Serial.print(F(" C, humidity is "));
+    Serial.print(hum);
+    Serial.println('%');
+  } else {
+    Serial.println(F("AHT10 read error!"));
+  }
+}

libraries/Wire/examples/BMP280_terminal/BMP280_terminal.ino

@@ -0,0 +1,50 @@
+
+/*
+  The BMP280 temperature and pressure sensor connected to I2C is used for this test.  
+  The example uses the Adafruit_BMP280 library, it must be installed first.
+*/
+
+#include <Wire.h>
+#include <Adafruit_BMP280.h>
+
+Adafruit_BMP280 bmp;
+
+void setup() {
+  Serial.begin(115200);
+  while( ! Serial )   
+    ;
+  Serial.println("BMP280 run test in terminal");
+
+  unsigned status;
+  status = bmp.begin(BMP280_ADDRESS_ALT, BMP280_CHIPID);
+  
+  if (!status) {
+    Serial.println("Could not find a valid BMP280 sensor!");
+    while(1) 
+      ;
+  }
+
+  /* Default settings from datasheet. */
+  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
+                  Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
+                  Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
+                  Adafruit_BMP280::FILTER_X16,      /* Filtering. */
+                  Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
+}
+
+void loop() {
+    Serial.print(F("Temperature = "));
+    Serial.print(bmp.readTemperature());
+    Serial.println(" *C");
+
+    Serial.print(F("Pressure = "));
+    Serial.print(bmp.readPressure());
+    Serial.println(" Pa");
+
+    Serial.print(F("Approx altitude = "));
+    Serial.print(bmp.readAltitude(1013.25)); /* Adjusted to local forecast! */
+    Serial.println(" m");
+
+    Serial.println();
+    delay(2000);
+}