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fineoffset WH0290 minor improvements #1639

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Merged
merged 2 commits into from
Jan 31, 2021
Merged

fineoffset WH0290 minor improvements #1639

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50de2c7
fineoffset; Improve WH0290 comments
gdt Jan 31, 2021
a5f826f
fineoffset: Decode family and unknown bit in WH0290
gdt Jan 31, 2021
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7 changes: 6 additions & 1 deletion src/devices/fineoffset.c
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Original file line number Diff line number Diff line change
Expand Up @@ -331,6 +331,7 @@ static int fineoffset_WH24_callback(r_device *decoder, bitbuffer_t *bitbuffer)
Fine Offset Electronics WH0290 Wireless Air Quality Monitor
Also: Ambient Weather PM25
Also: Misol PM25
Also: EcoWitt WH41

The sensor sends a package each ~10m. The bits are PCM modulated with Frequency Shift Keying.

Expand All @@ -339,7 +340,7 @@ Data layout:
FF DD ?P PP ?A AA CC BB

- F: 8 bit Family Code?
- D: 8 bit device id?
- D: 8 bit device id (corresponds to sticker on device in hex)
- ?: 1 bit?
- b: 1 bit MSB of battery bars out of 5
- P: 14 bit PM2.5 reading in ug/m3
Expand Down Expand Up @@ -384,7 +385,9 @@ static int fineoffset_WH0290_callback(r_device *decoder, bitbuffer_t *bitbuffer)
}

// Decode data
uint8_t family = b[0];
uint8_t id = b[1];
uint8_t unknown1 = (b[2] & 0x80) ? 1 : 0;
int pm25 = (b[2] & 0x3f) << 8 | b[3];
int pm100 = (b[4] & 0x3f) << 8 | b[5];
int battery_bars = (b[2] & 0x40) >> 4 | (b[4] & 0xC0) >> 6; //out of 5
Expand All @@ -397,6 +400,8 @@ static int fineoffset_WH0290_callback(r_device *decoder, bitbuffer_t *bitbuffer)
"battery_ok", "Battery Level", DATA_FORMAT, "%.1f", DATA_DOUBLE, battery_ok,
"pm2_5_ug_m3", "2.5um Fine Particulate Matter", DATA_FORMAT, "%i ug/m3", DATA_INT, pm25/10,
"pm10_0_ug_m3", "10um Coarse Particulate Matter", DATA_FORMAT, "%i ug/m3", DATA_INT, pm100/10,
"family", "FAMILY", DATA_INT, family,
"unknown1", "UNKNOWN1", DATA_INT, unknown1,
"mic", "Integrity", DATA_STRING, "CRC",
NULL);
/* clang-format on */
Expand Down