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69 lines
2.7 KiB
Markdown
69 lines
2.7 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/DS28CM00/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/DS28CM00/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/DS28CM00/blob/master/LICENSE)
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[](https://github.com/RobTillaart/DS28CM00/releases)
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# DS28CM00
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Arduino library for I2C DS28CM00 unique identification chip. \[48 bit\]
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## Description
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THe DS28CM00 IC has a 64 bit address consisting of one type byte, 0x50, 6 bytes unique serial and a CRC
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over the previous 7 bytes. This results in an 48 bits unique ID giving 281.474.976.710.656 combinations.
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If that number is not unique enough, you could use 2 or more of them with an I2C multiplexer.
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The DS28CM00 IC has the same addressing scheme as the better known DS18B20, except for the type byte.
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Therefore one could use an DS18B20 as an unique ID chip in a similar way and getting a temperature sensor
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as bonus.
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The DS28CM00 can work in 2 modes, I2C and SMBus mode. Check datasheet for details.
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## Interface
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### Constructor
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- **DS28CM00(TwoWire \*wire = &Wire)** Constructor, with default Wire as I2C bus.
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- **DS28CM00(uint8_t dataPin, uint8_t clockPin)** Constructor for ESP32, ESP8266 et al.
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### public
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- **void begin()** initializes I2C bus, sets default DS28CM00_I2C_MODE.
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- **bool getUID(uint8_t \*serial)** get unique 8 bytes serial number or error.
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Returns false if action failed.
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- **bool setI2CMode()** set DS28CM00_I2C_MODE (0x00). Returns false if action failed.
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- **bool setSMBusMode()** set DS28CM00_SMBUS_MODE (0x01). Returns false if action failed.
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- **bool getMode(uint8_t &mode)** returns mode set above. Returns false if action failed.
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## Operation
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See examples.
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The class is not tested extensively e.g. with ESP32 / ESP8266.
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An example sketch for ESP32 exist and compiles. Feedback welcome.
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## Future
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#### should
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- only extend on request / bugs
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- measure performance I2C 400 500 600 kHz ...
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#### could
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- cache the serial? (costs 8 bytes)
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- If (defined DS28_CACHE) ...
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#### wont
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- **bool getUID4()** to read only 4 bytes to improve performance. Possible?
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- **bool getUID(4)** number of bytes as parameter?
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- **uint8_t getError()** add error handling? - I2C; #bytes; mode; ...(too much for simple device)
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