uploaded I2C test firmware

nano_c_mk1/nano_c_mk1.ino

@@ -0,0 +1,32 @@
+#include <Adafruit_ADS1X15.h>
+
+#define WAIT_TIME      1000UL  // default wait time each value read
+#define ADS_MAX        4       // # of analog input pins of an ADS1115
+#define VOLTAGE_RANGE  6.144f  // ADS1115 default gain (+/- 6.144V)
+#define CONST_I2C      32768   // a constant value
+
+unsigned long currTime;  // non-blocking timer
+Adafruit_ADS1115 adc;
+int i;  // loop iterators
+
+void setup() {
+  Wire.begin();
+  Serial.begin(19200);
+  adc.begin();
+  currTime = millis();
+}
+
+void loop() {
+  // TODO: The current reading is too slow for even the arduino's own ide's grapher cannot parse the data in time
+  if (millis() - currTime >= WAIT_TIME) {  // non-blocking time delay
+  Serial.print("[");
+  for (i = 0; i < ADS_MAX; i++) {
+    Serial.print(adc.readADC_SingleEnded(i) * VOLTAGE_RANGE / CONST_I2C); // a raw to voltage conversion based from the library's method
+    if (i != ADS_MAX - 1) {
+      Serial.print(", ");
+    }
+  }
+  Serial.println("]");
+  currTime = millis();    
+  }
+}