diff --git a/Hctl2022.cpp b/Hctl2022.cpp
new file mode 100644
index 0000000..0641bfa
--- /dev/null
+++ b/Hctl2022.cpp
@@ -0,0 +1,150 @@
+#include <Arduino.h>
+#include "Hctl2022.h"
+
+//hardcoded arduino port used
+#define SET_PORT DDRB
+#define READ_PORT PINB
+
+Hctl2022::Hctl2022(int oe, int sel1, int sel2) 
+{
+    // 8 bits bus from hctl2022
+    SET_PORT = B00000000; // set pin 13,12,11,6,5,4,3,2 as input
+
+    // enable
+    pinMode(oe, OUTPUT);
+    _oe = oe;
+
+    // byte selector
+    pinMode(sel1, OUTPUT);
+    pinMode(sel2, OUTPUT);
+    _sel1 = sel1;
+    _sel2 = sel2;    
+}
+
+void Hctl2022::getMsb()
+{
+    _hi_old = READ_PORT;
+    _hi_new = READ_PORT;
+
+    if (_hi_old == _hi_new)
+    {
+        _result_hi = _hi_new;
+        return;
+    }
+    else
+    {
+        get2nd();
+    }
+}
+
+void Hctl2022::get3rd()
+{
+    _3rd_old = READ_PORT;
+    _3rd_new = READ_PORT;
+
+    if (_3rd_old == _3rd_new)
+    {
+        _result_3rd = _3rd_new;
+        return;
+    }
+    else
+    {
+        get2nd();
+    }
+}
+
+void Hctl2022::get2nd()
+{
+    _2nd_old = READ_PORT;
+    _2nd_new = READ_PORT;
+
+    if (_2nd_old == _2nd_new)
+    {
+        _result_2nd = _2nd_new;
+        return;
+    }
+    else
+    {
+        get2nd();
+    }
+}
+
+void Hctl2022::getLsb()
+{
+    _lo_old = READ_PORT;
+    _lo_new = READ_PORT;
+
+    if (_lo_old == _lo_new)
+    {
+        _result_lo = _lo_new;
+        return;
+    }
+    else
+    {
+        getLsb();
+    }
+}
+
+unsigned long Hctl2022::hctlRead()
+{
+    _result = 0;
+    _temp = 0;
+    unsigned long previousMillis = 0; 
+    unsigned long currentMillis = 0; 
+    
+    digitalWrite(_oe, HIGH); // disable oe
+
+    // delay 25ms
+    previousMillis = millis();
+    do 
+    {
+        currentMillis = millis();
+    }while(currentMillis - previousMillis >= 25);
+
+    // select MSB
+    digitalWrite(_sel1, LOW);
+    digitalWrite(_sel2, HIGH);
+    digitalWrite(_oe, LOW);
+
+    getMsb();
+
+    // select 2nd byte
+    digitalWrite(_sel1, HIGH);
+    digitalWrite(_sel2, HIGH);
+
+    get2nd();
+    
+    // select 3rd byte
+    digitalWrite(_sel1, LOW);
+    digitalWrite(_sel2, LOW);
+
+    get3rd();
+
+    // select LSB
+    digitalWrite(_sel1, HIGH);
+    digitalWrite(_sel2, LOW);
+
+    getLsb();
+
+    digitalWrite(_oe, LOW);// enable oe
+
+    // delay 25ms *************************maybe not mandatory
+    previousMillis = millis();
+    do
+    {
+        currentMillis = millis();
+    }while(currentMillis - previousMillis >= 25);
+
+    return 0;
+}
+
+void Hctl2022::hctlDebug()
+{
+    Serial.print("DEBUG HCTL");
+    Serial.print(" | MSB: " + _result_hi);
+    Serial.print(" | 3rd: " + _result_3rd);
+    Serial.print(" | 2nd: " + _result_2nd);
+    Serial.print(" | LSB: " + _result_lo);
+    Serial.print(" | result: " + _result); 
+} 
+