diff --git a/ADS1115_driver/main.c b/ADS1115_driver/main.c
new file mode 100644
index 0000000..2dbf99d
--- /dev/null
+++ b/ADS1115_driver/main.c
@@ -0,0 +1,110 @@
+[env:megaatmega2560]
+platform = atmelavr
+board = megaatmega2560
+framework = arduino
+
+#include "led.h"
+#include "delay.h"
+#include "sys.h"
+#include "usart.h"
+#include "lcd.h"
+#include "key.h"  
+#include "ads1115.h"
+ 
+float aa;    
+ 
+ int main(void)
+ { 
+     float t1; 
+   u16 t,result;
+     u8 key;
+     u16 i=0;
+ 
+    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// Set interrupt priority group 2
+    delay_init();             
+    uart_init(9600);         // The serial port is initialized to 9600
+    LED_Init();                  
+     //LCD_Init();    
+    KEY_Init();                 
+        //IIC initilize 
+    ADS1115_Init();
+  
+    while(1)
+    {
+        key=KEY_Scan(0);
+        if(key==WKUP_PRES)
+        {                
+          result=lvbo(0xeb,0x82);    // A0 A1 is the differential input test terminal, low eight bits + high eight bits 1111 1011, 1000 0010
+            
+            if(result >= 0x8000 && result <= 0xffff)
+                result = 0xffff - result;   //If the difference is negative, take the absolute value, so that A0 and A1 can be connected positively and negatively.
+             else if(result >= 0xffff)
+                result = 0;
+            
+          t1=4.096*2*result/65535;     //converted to voltage
+    
+            printf("The range is 4.096V, the voltage between A0-A1 = %f V\r\n",t1);//print
+            
+                if(result == 0x7fff || result == 0x8000)
+            {
+                printf("over range \r\n\r\n");
+            }
+            else
+            {
+                printf("Read OK \r\n\r\n");
+            }    
+        }
+        
+        if(key==KEY0_PRES)
+        {                 
+          result=lvbo(0xe3,0xb2); //A2 A3 is the differential input test terminal, low eight bits + high eight bits 1111 0011,1011 0010
+            
+            
+            if(result >= 0x8000)
+                result = 0xffff - result; //If the difference is negative, take the absolute value, so that A2 and A3 can be connected positively and negatively.
+            
+            
+          t1=4.096*2*result/65535;     //converted to voltage
+            
+            printf("The range is 4.096V, the voltage between A2-A3 = %f V\r\n",t1); //print
+            
+                if(result == 0x7fff || result == 0x8000) // exceeds the maximum value or falls below the minimum value
+            {
+                printf("over range \r\n\r\n");
+            }
+            else
+            {
+                printf("over range\r\n\r\n");
+            }    
+        }    
+        
+        if(key == KEY1_PRES)
+        {
+                  result=lvbo(0xe3,0xb4);    //A2 A3 is the differential input test terminal, low eight bits + high eight bits 1111 0011,1011 0100
+            
+            if((result >= 0x8000) && (result <= 0xffff))
+                result = 0xffff - result;   //If the difference is negative, take the absolute value, so that A0 and A1 can be connected positively and negatively.
+             else if(result >= 0xffff)
+                result = 0;
+          t1=2.048*2*result/65535;     //converted to voltage
+            
+            printf("The range is 2.048V, the voltage between A0-A1 = %f V\r\n",t1);//打印
+            if(result == 0x7fff || result == 0x8000)
+            {
+                printf("over range \r\n\r\n");
+            }
+            else
+            {
+                printf("over range \r\n\r\n");
+            }
+        }
+        
+        i++;
+        delay_ms(10);
+        if(i==20)
+        {
+            LED0=!LED0;//Prompt system is running   
+            i=0;
+            }           
+    }
+}
diff --git a/README.md b/README.md
index 7d23562..10bde68 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ ATTENTION MAC USER: currently the software cannot correctly functional on mac (e
 - axis window size is not correct
 - on PyInstaller, windows misdetected our executable as a virus
 - change the scale on Y-axis so that graph looks smoother
+- Errors thrown when >1 reference resistances entered
 
 ## Todos & [Old Specs](https://docs.google.com/document/d/1Km2HZel7rILOvgHG5iXlUcXFx4Of1ot2I7Dbnq8aTwY/edit?usp=sharing):
 - [ ] Fix Issues