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项目作者： hpaluch

项目描述 ：
Using I2C CJMCU-75 board with digital temperature sensor LM75A
高级语言： C
项目地址: git://github.com/hpaluch/i2c-cjmcu-75.git
创建时间： 2019-03-16T09:59:05Z
项目社区：https://github.com/hpaluch/i2c-cjmcu-75
开源协议：
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Using I2C board CJMCU-75 with LM75A

Here is sample project how to use CJMCU-75 board
with I2C LM75A Digital Temperature Sensor.

Project status:

  • Now can read temperature
    using: LC CH341A USB Adapter - project in VS2010. See project’s readme for more details.

CJMCU-75 Top

Setup

Here is reverse engineered schematic (drawn in Express SCH) of CJMCU-75 with LM75A address set to 0:

CJMCU-75 Schematic

NOTE:

I was surprised that the resistor labeled 300 is actually
200K Ohm (I would expect 30 * 10^0 = 30 Ohm which would be strange, but…)
This is even value which I get
on SMD resistor code calculator

You need to set I2C Device address before using CJMCU-75.

CJMCU-75 Bottom

I set device address to 0 soldering these pins (see above picture):

  1. A0 and GND together.
  2. A1 and GND together.
  3. A2 and GND together.

After soldering all three pins - A0, A1 and A2 to one of GND
or VCC the board is ready for use.