Catalog excerpts
Product Specification NDIR CO2 Sensor Module Shenzhen MemsFrontier Electronics Co., Ltd.
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Absolute Maximum Ratings Parameter
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Address Domain (1 bytes) Address domain refers to the address of the slave,The valid address range is 0 to 247,Where address 0 applies only to broadcast commands.In this application, there are the following conventions: a. Users can overwrite the address of the slave one to one with dedicated tools b. The slave can respond to a master request for a command with a 0xFE or 0x00 address domain, where the address domain is 0x00 is a broadcast command, and a 0xFE address domain is only available in one-to-one situations. Function Code (1 bytes) Regarding of detailed definition and usage method...
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while (datalen--) /* Complete the entire message buffer*/ { uIndex = uchCRCLo A *dataarray++; /* Calculate CRC */; uchCRCLo = uchCRCHi a auchCRCHi[uIndex]; uchCRCHi = auchCRCLo[uIndex]; } crc = (uint16_t)uchCRCHi *256; crc += (uint16_t)uchCRCLo; return crc; } Instructions in Details 1. Read Sensor Communication Address (use this to read the address recorded in EEP). Send: FE 03 14 00 01 00 55 A5
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2. Modify the Sensor's Communication Address Send: ( Modify the internal address to 0x60 ) FE 10 04 00 01 00 01 60 00 42 58 3. Set the Air Pressure Parameters Because the MTP40 sensor module supports atmospheric pressure compensation, loading an accurate atmospheric pressure value in the current environment will make the sensor output concentration more accurate. The range of the entered atmospheric pressure value is 700.0---1100.0. If this command is not used, the internal default pressure is 1013.0. Send: FE 67 01 01 00 40 7D 44 C4 A3 Among them, 00 40 7D 44 constitutes a single-precision...
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correct the measurement value. The range of input reference concentrations is 400--5000, described in four byte floating-point number. The entire calibration process lasts for approximately 2 minutes and may be longer. With this calibration function, firstly make sure that the MTP40C is in a relatively stable environment with no wind or only breeze. Send: FE 28 80 00 80 40 44 33 22 Among them, 01 byte indicates the instruction execution status. 01 indicates that the calibration has started. FF indicates calibration error, it may be that the input concentration is not within the range. 7....
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9. Read the Self Calibration Status Send: FE 28 67 4F DA Among them, the byte "00" indicates the status 00: open self-calibration FF: close self-calibration 10. Read the Self Calibration Period (hours) Through this command, you can read the current self-calibration cycle. Send: FE 28 69 CE 1E “48 00” constitutes the number of hours of the self-calibration cycle, that is, 0x0048 (72) 11. Set Self Calibration Cycle (hours) The self-calibration cycle can be set within a range of 24-720 hours. Send: FE 28 6A 64 00 0E A8 Among them, 00 is the status byte: 00 indicates correct operation; 01...
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I2C Instruction Descriptions The module operates in I2C slave mode and can be connected to an external MCU with a pull-up resistor inside the module. The slave address is: 0x31 (7-bit address) The write operation address is: 0x62 The read operation address is: 0x63 Timing sequence of the master: 1. Send a start signal; 2. Send an address to write(slave address + R/W=0x62) and check responses; 3. Send a read command (0x52) and check the responses; 4. Send a stop signal; 5. Send a start signal; 6. Send an address to read (slave address + R/W(1) =0x63) and check responses; 7. Read 7 bytes from...
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Shenzhen MemsFrontier Electronics Co., Ltd. Tel: +86-755-21386871 Email: sales@memsf.com Add: 3/F, B2 Bldg., China Merchants Guangming Sci-Tech Park, Guanguang Rd., Guangming Dist., Shenzhen, Guangdong, 518107, China. www.memsf.com
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