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diff --git a/m0EEPROM.h b/m0EEPROM.h
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+// m0EEPROM.h - definitions for 24LC256 EEPROM read and write for m0 SAMD21G18 and adafruit feather
+#ifndef M0EEPROM_H
+#define M0EEPROM_H
+
+class eeprom {
+    int _device_address; // chip address.  currently only supporting one
+public:
+    begin(device_address=0x50) : _device_address(device_address){}
+
+    // read a byte from the specified address in eeprom memory
+    uint8_t read_byte(uint16_t address);
+
+    // write a single byte of data to the given address in eeprom memory
+    void write_byte(uint16_t address, uint8_t value);
+
+    // read a structure of arbitrary size from address.
+    // the size of the structure must be less than 64K-address.
+    // returns a byte array of memory specified.  The byte array data
+    // must be preallocated to the expected size.
+    uint8_t* read_bytes(uint16_t address, uint8_t* data, uint16_t size);
+
+    //  write a structure of arbitrary size to memory at address.
+    //  the size of the structure must be less than 64K-address.
+    //  The structure is passed as a byte array.
+    void write_bytes(uint16_t address, uint8_t* data, uint16_t size);`
+};
+
+#endif // M0EEPROM_H