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DigiH merged 8 commits into from
Jan 24, 2026
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Merged

Add Govee H5140 Smart CO2 Monitor #684

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27d23f0
Add Govee H5140 Smart CO2 Monitor decoder
bafulton Jan 24, 2026
319230a
Fix H5140 condition to check manufacturer data header
bafulton Jan 24, 2026
45c2583
Add H5140 to BLE_ID_NUM enum
bafulton Jan 24, 2026
5bb254d
Address review feedback for H5140 decoder
bafulton Jan 24, 2026
2b1a961
Add regression test cases for H5140 decoder
bafulton Jan 24, 2026
e1822af
Fix test expected output - remove cidc field
bafulton Jan 24, 2026
afe7ea7
tag correction
DigiH Jan 24, 2026
29a02bf
test adjustment for tag correction
DigiH Jan 24, 2026
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12 changes: 12 additions & 0 deletions docs/devices/H5140.md
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# Govee H5140

|Model Id|[H5140](https://github.com/theengs/decoder/blob/development/src/devices/H5140_json.h)|
|-|-|
|Brand|Govee|
|Model|Smart CO2 Monitor|
|Short Description|Air quality monitor with temperature, humidity and CO2|
|Communication|BLE broadcast|
|Frequency|2.4Ghz|
|Power Source|USB-C|
|Exchanged Data|temperature, humidity, CO2|
|Encrypted|No|
1 change: 1 addition & 0 deletions src/decoder.h
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Expand Up @@ -92,6 +92,7 @@ class TheengsDecoder {
H5074,
H5102,
H5106,
H5140,
H5179,
H5179_N,
HHCCJCY10,
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2 changes: 2 additions & 0 deletions src/devices.h
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Expand Up @@ -36,6 +36,7 @@
#include "devices/H5074_json.h"
#include "devices/H5102_json.h"
#include "devices/H5106_json.h"
#include "devices/H5140_json.h"
#include "devices/H5179_json.h"
#include "devices/HHCCJCY10_json.h"
#include "devices/HHCCJCY01HHCC_json.h"
Expand Down Expand Up @@ -188,6 +189,7 @@ const char* _devices[][2] = {
{_H5074_json, _H5074_json_props},
{_H5102_json, _H5102_json_props},
{_H5106_json, _H5106_json_props},
{_H5140_json, _H5140_json_props},
{_H5179_json, _H5179_json_props},
{_H5179_json_N, _H5179_json_props},
{_HHCCJCY10_json, _HHCCJCY10_json_props},
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69 changes: 69 additions & 0 deletions src/devices/H5140_json.h
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const char* _H5140_json = "{\"brand\":\"Govee\",\"model\":\"Smart CO2 Monitor\",\"model_id\":\"H5140\",\"tag\":\"0f03\",\"condition\":[\"name\",\"contain\",\"GV5140\",\"&\",\"manufacturerdata\",\">=\",20,\"index\",0,\"01000101\"],\"properties\":{\"tempc\":{\"decoder\":[\"value_from_hex_data\",\"manufacturerdata\",8,6,false,false],\"post_proc\":[\"/\",10000]},\"hum\":{\"decoder\":[\"value_from_hex_data\",\"manufacturerdata\",8,6,false,false],\"post_proc\":[\"&\",2147483647,\"%\",1000,\"/\",10]},\"co2\":{\"decoder\":[\"value_from_hex_data\",\"manufacturerdata\",14,4,false,false]}}}";
/* R""""(
{
"brand":"Govee",
"model":"Smart CO2 Monitor",
"model_id":"H5140",
"tag":"0f03",
"condition":["name", "contain", "GV5140", "&", "manufacturerdata", ">=", 20, "index", 0, "01000101"],
"properties":{
"tempc":{
"decoder":["value_from_hex_data", "manufacturerdata", 8, 6, false, false],
"post_proc":["/", 10000]
},
"hum":{
"decoder":["value_from_hex_data", "manufacturerdata", 8, 6, false, false],
"post_proc":["&", 2147483647, "%", 1000, "/", 10]
},
"co2":{
"decoder":["value_from_hex_data", "manufacturerdata", 14, 4, false, false]
}
}
})"""";*/

/*
* Govee H5140 Smart CO2 Monitor - BLE Manufacturer Data Format
* =============================================================
*
* Advertisement name pattern: GV5140XXXX (where XXXX is device suffix)
* Manufacturer data: 20 hex characters (10 bytes)
*
* Byte layout:
* Positions 0-7: 01000101 (constant header)
* Positions 8-13: XXXXXX (24-bit combined temp/humidity)
* Positions 14-17: YYYY (16-bit CO2 in ppm, big-endian)
* Positions 18-19: 00 (padding/unknown)
*
* Decoding formulas:
* - temp_celsius = 24bit_value / 10000
* - humidity_percent = (24bit_value % 1000) / 10
* - co2_ppm = 16bit_value
*
* Example: 0100010103fcbf044c00
* - Header: 01000101
* - Temp/Hum: 03fcbf = 261311 decimal
* - Temperature: 261311 / 10000 = 26.13°C (79.04°F)
* - Humidity: (261311 % 1000) / 10 = 31.1%
* - CO2: 044c = 1100 ppm
*
* Tested with OpenMQTTGateway on ESP32
*/

const char* _H5140_json_props = "{\"properties\":{\"tempc\":{\"unit\":\"°C\",\"name\":\"temperature\"},\"hum\":{\"unit\":\"%\",\"name\":\"humidity\"},\"co2\":{\"unit\":\"ppm\",\"name\":\"carbon_dioxide\"}}}";
/*R""""(
{
"properties":{
"tempc":{
"unit":"°C",
"name":"temperature"
},
"hum":{
"unit":"%",
"name":"humidity"
},
"co2":{
"unit":"ppm",
"name":"carbon_dioxide"
}
}
})"""";*/
9 changes: 9 additions & 0 deletions tests/BLE/test_ble.cpp
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Expand Up @@ -237,6 +237,9 @@ const char* expected_mfg[] = {
"{\"brand\":\"Victron Energy\",\"model\":\"Smart Battery Sense\",\"model_id\":\"VICTSBS\",\"type\":\"ENRG\",\"track\":true,\"volt\":12.99,\"tempc\":17.5,\"tempf\":63.5,\"alarm_reason\":0}",
"{\"brand\":\"Victron Energy\",\"model\":\"Smart Battery Sense\",\"model_id\":\"VICTSBS\",\"type\":\"ENRG\",\"track\":true,\"volt\":14.01,\"tempc\":17.5,\"tempf\":63.5,\"alarm_reason\":0}",
"{\"brand\":\"Victron Energy\",\"model\":\"Smart Battery Sense\",\"model_id\":\"VICTSBS\",\"type\":\"ENRG\",\"track\":true,\"volt\":12.22,\"tempc\":22.5,\"tempf\":72.5,\"alarm_reason\":0}",
"{\"brand\":\"Govee\",\"model\":\"Smart CO2 Monitor\",\"model_id\":\"H5140\",\"type\":\"AIR\",\"cidc\":false,\"acts\":true,\"tempc\":26.1311,\"tempf\":79.03598,\"hum\":31.1,\"co2\":1100}",
"{\"brand\":\"Govee\",\"model\":\"Smart CO2 Monitor\",\"model_id\":\"H5140\",\"type\":\"AIR\",\"cidc\":false,\"acts\":true,\"tempc\":15.56,\"tempf\":60.008,\"hum\":60,\"co2\":500}",
"{\"brand\":\"Govee\",\"model\":\"Smart CO2 Monitor\",\"model_id\":\"H5140\",\"type\":\"AIR\",\"cidc\":false,\"acts\":true,\"tempc\":23.8048,\"tempf\":74.84864,\"hum\":4.8,\"co2\":1700}",
};

const char* expected_name_uuid_mfgsvcdata[] = {
Expand Down Expand Up @@ -828,6 +831,9 @@ const char* test_mfgdata[][3] = {
{"Victron Smart Battery Sense", "", "e1021180a5a302ffff7bffff130500008971feff7fffffffff"},
{"Victron Smart Battery Sense", "", "e1021180a5a302ffff7bffff790500008971feff7fffffffff"},
{"Victron Smart Battery Sense", "", "e1021100a4a302ffff7cffffc60400007d73feff7fffffffff"},
{"H5140", "GV5140_1234", "0100010103fcbf044c00"},
{"H5140", "GV5140_1234", "01000101025fd001f400"},
{"H5140", "GV5140_1234", "0100010103a1e006a400"},
};

TheengsDecoder::BLE_ID_NUM test_mfgdata_id_num[]{
Expand Down Expand Up @@ -1048,6 +1054,9 @@ TheengsDecoder::BLE_ID_NUM test_mfgdata_id_num[]{
TheengsDecoder::BLE_ID_NUM::VICTSBS,
TheengsDecoder::BLE_ID_NUM::VICTSBS,
TheengsDecoder::BLE_ID_NUM::VICTSBS,
TheengsDecoder::BLE_ID_NUM::H5140,
TheengsDecoder::BLE_ID_NUM::H5140,
TheengsDecoder::BLE_ID_NUM::H5140,
};

// uuid test input [test name] [device name] [uuid] [manufacturer data] [service data]
Expand Down