What is it?

Particulate detector for PM1 / PM2.5 / PM10 measurement

New CircuitPython 5.0 example available in Github

Sensor and attachment cable only option

This is a Laser Particle detector and density sensor with USB interface. Micro-particulates are hazardous in general and can be a trigger for chronic conditions like asthma. Local particulate pollution readings are usually difficult to obtain with very few monitoring stations conveniently placed where you happen to be breathing the air. This device can easily detect and measure invisible sensing targets like second-hand smoke or fine diesel particulates that can be troublesome irritants to anyone with sensitive lungs. The IARC and WHO designate airborne particulates a Group 1 carcinogen. More information on Particulates

• Model: ZH03B
• Detection Gas: PM1.0, PM2.5, PM10
• Output: UART OUTPUT (3V TTL) / PWM output
• Working Voltage: 5V±0.1V
• Working Current: <120mA
• Dormancy current: <10mA
• Response Time: T90≤45s
• Working Humidity: 0~85%RH (no condensation)
• Working Temperature: -10~50°C
• Storage Temperature: -30~70°C
• Life Span: 3 years (in air)
• Dimension: 50x32.4x21mm(LxWxH)

Why did you make it?

In October 2017, we had firestorms that pumped harmful particulates into the air - my home was in the plume, with large embers falling to the ground. We knew the air outside was bad, but had no way to determine if the indoor air was much better. How do you measure the particulates present in the air or in your own home? How can you verify the expensive HEPA filter is functioning? I built this as a new sensor option for Mycodo, my favorite sensor platform. The sensor is fully implemented with control of the sampling fan.

Mycodo

You can be up and running with graphic output and relay control on Raspberry Pi in a very short time with Mycodo. I also have python and CircuitPython code available as examples.

What makes it special?

The USB interface allows optimal placement - right where you want to take measurements. I provide a python3 driver that has been tested with Raspberry Pi and OSx High Sierra. I also provide a python function library that allows control of the fan ( on/off ) and the operating mode. Power consumption drops dramatically when the fan is turned off - but then you cannot take readings. After power up - the sensor outputs readings about 10 times a second. The simple driver parses these readings for display.

PM1 level:  82 PM2.5 level:  101 PM10 level:  115
PM1 level:  83 PM2.5 level:  102 PM10 level:  116
PM1 level:  83 PM2.5 level:  102 PM10 level:  117
PM1 level:  83 PM2.5 level:  102 PM10 level:  117
PM1 level:  83 PM2.5 level:  102 PM10 level:  117
PM1 level:  83 PM2.5 level:  102 PM10 level:  117
PM1 level:  83 PM2.5 level:  102 PM10 level:  117
PM1 level:  83 PM2.5 level:  102 PM10 level:  117

I have left the other connections to the PWM and analog output and other functions available, enclosed in shrink tubing. This sensor has been fully integrated into Mycodo