pollutagNode2: new LoRaWAN node for sensor.community from pollutants.eu
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- Category: Devices
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Hello Guys, pollutagNode2 almost here, and will be prototyped soon.
Advatages:
1. LaraWAN node based on STM32WLE MCU (LORA-E5), easy to integrate monitoring and control node (air quality monitoring, garden, intelligent home. etc.)
2. You may connect load remotely by downlinks - via AO3400A transistor (on board)
3. New Sensirion SEN54 sensor optimized
4. MPPT and Li-Ion battery charger for power from 5V++ cheap solar panels.
5. Sleep current below 1mA expected
6. 10+ years of autonomity with cheap 2W solar panel and standard 1850 Li-Ion battery
7. More than 2 weeks work autonomity from fully charged 3500mA Li-Ion battery
8. Ideal for sensor.community integration over LoRaWAN IoT, like TTN and Helium, no internet connection from your side needed!
9. Full fledged with routed test points - easy to solder - easy to add functionality (inputs, outputs, interfaces etc.)
Vařením lze odstranit více než osmdesát procent mikroplastu z vody
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- Category: Econews
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Čínští vědci zjistili, že vařením lze odstranit více než osmdesát procent mikroplastu z vody.
Vědci neustále hledají levné a dostupné metody čištění vody od plastového znečištění. Pán Čžan Ťün-li (Zhanjun Li) z Lékařské univerzity v Kantoně a pan Eddie Čcheng (Eddy Y. Zeng) z Univerzity v Čchin-lingu ve spolupráci s kolegy zjistili, že se dá zbavit části takového znečištění jednoduše vařením vody. Spolu prověřovali, zda by zahřátí vody na vření nedokázalo snížit množství drobných plastových částic v ní obsažených.
Tato metoda je lepší pro tvrdou vodu: při vaření se částice plastu váží na uhličitan vápenatý a usazují se na dně. Výsledky výzkumu byly publikovány v časopise Environmental Science & Technology Letters.
4 Feb 2024
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Air quality significantly improved due to good wind, blown away all the smog. Enjoy fresh air.
Pollutag Node: the integration guide
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- Category: Devices
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1. Our LoRaWAN payload settled by following fragment of code:
AppData.Port = LORAWAN_USER_APP_PORT; AppData.Buffer[i++] = (PM1) >> 8; AppData.Buffer[i++] = (PM1)%256; AppData.Buffer[i++] = (PM2_5)>>8; AppData.Buffer[i++] = (PM2_5)%256; AppData.Buffer[i++] = (PM10)>>8; AppData.Buffer[i++] = (PM10)%256; int16_t tempVar; tempVar = ((int16_t)(temperatureTX*100.0)) + 10000; AppData.Buffer[i++] = tempVar/100; AppData.Buffer[i++] = tempVar%100; tempVar = ((int16_t)(humidity*100.0)); AppData.Buffer[i++] = tempVar/100; AppData.Buffer[i++] = tempVar%100; AppData.Buffer[i++] = VOC/256; AppData.Buffer[i++] = VOC%256; AppData.Buffer[i++] = extBattery; AppData.Buffer[i++] = LEDON;
here you may see, than first 2 bytes in payload occupied by PM1 data (ultradisperse particles), next 2 bytes: PM2.5, then next 2 bytes: PM10, next 2 bytes by temperature, next 2 bytes by humidity, next 2 bytes by VOC (volatile organic compounds index), next byte by battery charge and the last one is LED status on/off.
2. In helium console we need to create decoder function (menu Functions), example flow:
decoder function may look like:
function Decoder(bytes, port, uplink_info) { var decoded = {}; decoded.PM1 = ((bytes[0]*256 + bytes[1])/10.0).toFixed(2); decoded.PM2_5 = ((bytes[2]*256 + bytes[3])/10.0).toFixed(2); decoded.PM10 = ((bytes[4]*256 + bytes[5])/10.0).toFixed(2); decoded.T = (-100.0 + bytes[6] + bytes[7]/100.0).toFixed(2); decoded.RH = (bytes[8] + bytes[9]/100).toFixed(2); decoded.VOC = ((bytes[10]*256 + bytes[11])/10.0).toFixed(2); decoded.Battery = (bytes[12]*(2.82/76)).toFixed(2);//52.08;//31.06; decoded.LEDON = bytes[13]; return decoded; }
3. After decoder next step to pass (see flow above) webhook to devices.sensor.community with your node tag . Particulate matter (PM10 and PM2.5) and (temperature and humidity) separately.
These webhooks in helium console created like integrations:
HTTP webhooks integrations:
1.a) set the header, for PM particles as following (this node001_PM webhook):
* sensor ID =
Sensor UID |
---|
below is printscreen from sensor.community:
1.b) set the Advanced - JSON Message Template on the same page as follow (TEMPLATE BODY) - will be available then you press "ADD INTEGRATION" on the bottom :
{ "software_version": "1", "sensordatavalues": [ {"value_type": "P1","value": "{{decoded.payload.PM10}}"}, {"value_type": "P2","value": "{{decoded.payload.PM2_5}}"} ] }
2.a) Next webhook dedicated to temperature and humidity (node001_TH webhook):
* sensor ID =
Sensor UID |
---|
2.b) set the Advanced - JSON Message Template on the same page as follow (TEMPLATE BODY) - will be available then you press "ADD INTEGRATION" on the bottom:
{ "software_version": "1", "sensordatavalues": [ {"value_type":"temperature","value": "{{decoded.payload.T}}"}, {"value_type":"humidity","value": "{{decoded.payload.RH}}"} ] }
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