Grove - Dust Sensor User Manual Release date： 2015/9/23 Version： 1.0 Wiki: http://www.seeedstudio.com/wiki/Grove_-_Dust_sensor Bazaar:http://www.seeedstudio.com/depot/Grove-Dust-Sensor-p1050.
Document Revision History Revision Date Author Description 1.0 Sep 23, 2015 Jiankai.
Contents Document Revision History ·········································································2 1. Introduction ·······················································································2 2. Features ····························································································3 3. Application Ideas ·················································································4 4.
Disclaimer For physical injuries and possessions loss caused by those reasons which are not related to product quality, such as operating without following manual guide, natural disasters or force majeure, we take no responsibility for that. Under the supervision of Seeed Technology Inc., this manual has been compiled and published which covered the latest product description and specification. The content of this manual is subject to change without notice.
1. Introduction This Dust Sensor measures the Particulate Matter level in air by counting the Lo Pulse Occupancy time(LPO time) in given time unit. LPO time is in proportion to PM concentration. This sensor can provide you pretty reliable data for air purifier system because it's still responsive to particulates whose diameter is 1um. Note: This sensor use counting method to test dust concentration but not weight method, and the unit is pcs/L or pcs/0.01cf.
2. Features Highly responsive Reliable ROHS/PEACH compliant Note: New version updates output Hi Voltage from Approx. over 4.0V change to Approx over 4.5V.
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4. Cautions Please keep it upright. 3 min preheat time is required when used at the first time. Arbitrary operation may cause unexpected damage. Pins VR1 and VR2 come preset. Please DON'T change the default configuration.
5. Specification Items Min Norm Max Unit VCC 4.75 - 5.25 V Standby Current Supply - 90 - mA Detectable range of concentration - 0~28,000 / 0 ~ 8000 - pcs/liter / pcs/0.01cf Operating Temperature Range 0 - 45 °C Output Method Negative Logic, Digital output,Hi over 4.0V(Rev.2) Lo: under 0.
6. Usage Here is a demo to show you how to obtain PM concentration data from this Grove - Dust Sensor. 1. Plug the dust sensor into digital port D8 on the Grove - Base Shield. It can only be D8, because the operation of this sensor involves sampling, a function only can be achieved by D8, the capture input pin of Atmage328P, on Arduino/Seeeduino. Also you can connect Grove - Dust sensor to Arduino UNO without Base Shield : Arduino UNO Dust Sensor 5V Red wire GND Black wire Digit 8 Yellow wire 2.
void loop() { duration = pulseIn(pin, LOW); lowpulseoccupancy = lowpulseoccupancy+duration; if ((millis()-starttime) > sampletime_ms)//if the sampel time == 30s { ratio = lowpulseoccupancy/(sampletime_ms*10.0); // Integer percentage 0=>100 concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve Serial.print("concentration = "); Serial.print(concentration); Serial.println(" pcs/0.01cf"); Serial.println("\n"); lowpulseoccupancy = 0; starttime = millis(); } } In this prog
"concentration" is a figure that has physical meaning. It's calculated from the characteristic graph below by using the LPO time. Here is a figure we tested dust concentration in office : We can see the concentration of dust is very low in the evening, but it's higher in the afternoon. Maybe you can set a threshold value while the concentration is beyond a value. Also, if you wanna set the sensor more sensitive you can add a fan on the sensor, and add a 10k resistor between the Pin5 and Ground.
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8. Reference Building a low-cost networked PM2.5 monitor -- Made by A.J. Measuring the Pickle Jr. – a modified PPD42 with an attached fan. -- Made by A.J.
9. Related Projects If you want to make some awesome projects by Dust Sensor, here's some projects for reference. Air Quality Box This is an IoT demo make by Seeeduino and Grove. More and More concern are being paid to the environmental air quality nowadays because the tiny granule in the around air can badly endanger people’s health. We always get the information of environment from our government department. But it’s the average value of the whole city / section.
We cooperate with our Core Users in the development of our new product, this, in another word, the Core Users will have the chance to experience any new products of Seeed before its official launch, and in return we expect valuable feedback from them to help us improving the product performance and user experience. And for most of cases if our Core Users have any good ideas for making things, we'll offer hardware pieces, PCBA services as well as technical support.
