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diff --git a/oled/BitBang_I2C.h b/oled/BitBang_I2C.h
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+//
+// Bit Bang I2C library
+// Copyright (c) 2018 BitBank Software, Inc.
+// Written by Larry Bank (bitbank@pobox.com)
+// Project started 10/12/2018
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+#ifndef __BITBANG_I2C__
+#define __BITBANG_I2C__
+// supported devices
+enum {
+  DEVICE_UNKNOWN = 0,
+  DEVICE_SSD1306,
+  DEVICE_SH1106,
+  DEVICE_VL53L0X,
+  DEVICE_BMP180,
+  DEVICE_BMP280,
+  DEVICE_BME280,
+  DEVICE_MPU6000,
+  DEVICE_MPU9250,
+  DEVICE_MCP9808,
+  DEVICE_LSM6DS3,
+  DEVICE_ADXL345,
+  DEVICE_ADS1115,
+  DEVICE_MAX44009,
+  DEVICE_MAG3110,
+  DEVICE_CCS811,
+  DEVICE_HTS221,
+  DEVICE_LPS25H,
+  DEVICE_LSM9DS1,
+  DEVICE_LM8330,
+  DEVICE_DS3231,
+  DEVICE_LIS3DH,
+  DEVICE_LIS3DSH,
+  DEVICE_INA219,
+  DEVICE_SHT3X,
+  DEVICE_HDC1080,
+  DEVICE_MPU6886,
+  DEVICE_BME680,
+  DEVICE_AXP202,
+  DEVICE_AXP192,
+  DEVICE_24AAXXXE64,
+  DEVICE_DS1307
+};
+
+#ifndef LOW
+#define LOW 0
+#define HIGH 1
+#endif
+
+typedef struct mybbi2c
+{
+uint8_t iSDA, iSCL; // pin numbers (0xff = disabled)
+uint8_t bWire; // use the Wire library
+uint8_t iSDABit, iSCLBit; // bit numbers of the ports
+uint32_t iDelay;
+} BBI2C;
+//
+// Read N bytes
+//
+int I2CRead(BBI2C *pI2C, uint8_t iAddr, uint8_t *pData, int iLen);
+//
+// Read N bytes starting at a specific I2C internal register
+//
+int I2CReadRegister(BBI2C *pI2C, uint8_t iAddr, uint8_t u8Register, uint8_t *pData, int iLen);
+//
+// Write I2C data
+// quits if a NACK is received and returns 0
+// otherwise returns the number of bytes written
+//
+int I2CWrite(BBI2C *pI2C, uint8_t iAddr, uint8_t *pData, int iLen);
+//
+// Scans for I2C devices on the bus
+// returns a bitmap of devices which are present (128 bits = 16 bytes, LSB first)
+//
+// Test if an address responds
+// returns 0 if no response, 1 if it responds
+//
+uint8_t I2CTest(BBI2C *pI2C, uint8_t addr);
+
+// A set bit indicates that a device responded at that address
+//
+void I2CScan(BBI2C *pI2C, uint8_t *pMap);
+//
+// Initialize the I2C BitBang library
+// Pass the pin numbers used for SDA and SCL
+// as well as the clock rate in Hz
+//
+void I2CInit(BBI2C *pI2C, uint32_t iClock);
+//
+// Figure out what device is at that address
+// returns the enumerated value
+//
+int I2CDiscoverDevice(BBI2C *pI2C, uint8_t i);
+
+#endif //__BITBANG_I2C__
+