add default main with temporary 'SSD1306Ascii' library

- official library takes 132% of the arduino uno memory so no way we use it; it is mainly due to the buffer which is 32x128 bytes
 - the next step is to reverse-engineer it to keep no buffer and rely on a state according to our very own usage

twinmax/twinmax.h

@@ -0,0 +1,22 @@
+#ifndef _TWINMAX_H_DEF_
+#define _TWINMAX_H_DEF_
+
+  #include "sensors.h"
+
+	#include <Wire.h>
+	#include "SSD1306Ascii.h"
+	#include "SSD1306AsciiWire.h"
+
+	#define PUSH_BTN_PIN		7
+	#define POTENTIOMETER_PIN	A0
+	#define PRESSURE_LEFT		A1
+	#define PRESSURE_RIGHT		A2
+
+	#define DISP_DATA  A4
+	#define DISP_CLCK  A5
+	#define DISP_ADDR  0x3C
+
+	enum Mode { RELATIVE, ABSOLUTE };
+	Mode mode = ABSOLUTE;
+
+#endif

twinmax/twinmax.ino

@@ -0,0 +1,44 @@
+#include "twinmax.h"
+
+SSD1306AsciiWire oled;
+Pressure      pleft;
+Pressure      pright;
+PushButton    btn;
+Potentiometer slider;
+
+void setup()
+{
+	Wire.begin();
+	Wire.setClock(400000L);
+
+	pleft.setup(PRESSURE_LEFT);
+	pright.setup(PRESSURE_RIGHT);
+	btn.setup(PUSH_BTN_PIN);
+	slider.setup(POTENTIOMETER_PIN);
+
+	Serial.begin(9600);
+
+	oled.begin(&Adafruit128x32, DISP_ADDR);
+	oled.clear();
+}
+
+void loop()
+{
+	if( btn.tap() ){
+		mode = (mode == RELATIVE) ? ABSOLUTE : RELATIVE;
+	}
+
+	oled.clear();
+	oled.setFont();
+	if( mode == RELATIVE ) oled.println("  relative  ");
+	if( mode == ABSOLUTE ) oled.println("  absolute  ");
+
+
+  oled.setFont(Callibri11);
+	oled.print(slider.range());
+	oled.print(": ");
+	oled.print(pleft.value()); oled.print("-");
+	oled.println(pright.value());
+
+	delay(100);
+}