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I recently ordered and CJMCU-200 FT200XD a USB to I2C and I am trying to read information from a BME280 using it's I2C output. I am new to FTDI and am having some trouble finding information on how to setup such a device. I plan to write a program the would read in the serial data. My question is did I get the right kind of USB to I2C chip? I have been reading other questions and the problem half the time is the wrong chip.

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closed as too broad by Chris Stratton, Elliot Alderson, Finbarr, Lior Bilia, Voltage Spike Feb 8 at 17:37

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ There are cloned FTDI chips around that don't work properly with official drivers. \$\endgroup\$ – Spehro Pefhany Feb 5 at 15:19
  • \$\begingroup\$ I have installed the drivers and the suggested program to interface but I don't get consistent results. I am guessing that I am missing something. \$\endgroup\$ – Michael H. Feb 5 at 17:42
  • \$\begingroup\$ @MichaelH. You'll need an oscilloscope and look at the lines, you should at least be able to send commands and 'toggle' the lines. Make sure you have pull ups \$\endgroup\$ – Voltage Spike Feb 8 at 17:37
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No. What is needed is a USB chip than can act as a I2C master. FT200XD is a I2C slave chip, so it cannot be used as a master to talk to another I2C slave like the BME280 in the question.

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    \$\begingroup\$ +1 good point, the datasheet says, on p.12, "The FT200XD device only operates as a slave," \$\endgroup\$ – Ale..chenski Feb 5 at 17:54
  • \$\begingroup\$ Yeah I caught the slave thing a bit to late. Thank you for the information. \$\endgroup\$ – Michael H. Feb 5 at 19:52

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