| Author | Eur van Andel, eur@fiwihex.nl Copyright (c) 2008 |
| Adapted-by | |
| Compiler | =2.4h |
this library communicates with the T6603 GE/Telaire CO2 sensor. This sensor uses the Telaire Tsunami-Lite Commnications Protocol (no kidding), which is a definition with zero hits on Google. available functions are: get_status() return byte get_co2_ppm() return word -- CO2 concentration in ppm get_serial_numer() return string[15] get_elevation_m() return word -- in meters above sea level
The brochure is here: www.gesensing.com/downloads/datasheets/920-419A_LR.pdf Some clippings from the protocol document: ------------ START OF PROTOCOL DOCUMENT CLIPPINGS ---------------------
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const ELEVATION = 0x0F
const SERIAL = 0x01
var word co2_global -- global CO2 value, keeps value when garbage reply
const FLAG = 0xFF
const CMD_READ = 0x02
const BRDCST = 0xFE
const CMD_UPDATE = 0x03
const CMD_STATUS = 0xB6
const CO2_PPM = 0x03
const ELEVATION = 0x0F
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const SERIAL = 0x01
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var word co2_global -- global CO2 value, keeps value when garbage reply
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const FLAG = 0xFF
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const CMD_READ = 0x02
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const BRDCST = 0xFE
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const CMD_UPDATE = 0x03
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const CMD_STATUS = 0xB6
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const CO2_PPM = 0x03
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set_co2_elevation_m(word in meters)
should set elevation in meters above sea level, not implemented yet
get_co2_serial_number(byte out str[8])
returns 8 byte ASCII string, which should be the same as the number on the sticker
get_co2_elevation_m() return word
returns programmed elevation above sea level in meters this elevation is uses to calculate CO2 concentration correctly
get_co2_ppm() return word
returns a word with CO2 concentration in ppm note: if sensor is busy measuring the CO2 values, it will give garbage reply reply is checked for garbage and if so, *PREVIOUS* ppm value is returned
get_co2_status() return byte
returns status byte. bit_0 = error, bit_1 = warmup, bit_2 = calibration, bit_3 = idle
| sample | 16f876a_t6603.jal |
| sample | 16f877a_co2_t6603.jal |