Product FAQ

How do I use the Metriful MS430 sensor board?

1. Connect the board to your host system (Raspberry Pi, Arduino, ESP8266, ESP32, etc.)

2. Run one of our open source software examples to display, transmit or interact with the data.

The code and full setup instructions are provided on our GitHub page.

What are the minimum requirements for the host system?

The host must have an I2C-compatible port, run at either 3.3 V or 5 V, and have at least one digital input (three digital inputs for full functionality). Raspberry Pi, Arduino, ESP8266, ESP32 and many other embedded systems meet these requirements.

What are the code examples?

We provide a set of open-source software examples ready to run on Raspberry Pi, Arduino, ESP8266 and ESP32. These are fully functional example applications for using your environment data. They include IoT data storage, home automation interfaces, webpage servers and interrupt monitoring.

You can also edit and adapt these to create your own custom solutions.

The code and setup instructions are hosted on our GitHub page.

What does it measure?

The MS430 measures eighteen variables describing the indoor environment:

Air quality index, temperature, humidity, air pressure, illuminance, white light level, air particle concentration*, VOC gas measurement, estimated CO2 concentration, estimated human breath concentration, sound noise level, sound frequency bands (six, from 90 Hz to 6 kHz), sound peak amplitude

Each variable is explained in detail in the User Guide, available on GitHub.

*Using an external particle sensor (purchased separately)

What is a jumper wire?

Sometimes called "Dupont" wires, these let you electrically connect circuit boards and/or breadboards with an easy push-fit. The wire ends have pins/sockets allowing connection to sockets/pins. To be compatible, circuit boards must first be fitted with header pins/sockets (attached by soldering). Some systems (Raspberry Pi and Arduino Uno) can use jumper wires without any breadboard. Other systems (e.g. Arduino Nano 33 IoT) need a breadboard as well as jumper wires.

What is a soldered header?

Headers are a strip of metal pins that allow a circuit board to be connected to jumper wires or breadboards with an easy push-fit. They are present on Raspberry Pi and most Arduinos. Headers must be soldered to the circuit board before use. We supply sensor boards with unsoldered or (for a small extra charge) soldered headers. There are two styles to choose from: straight pins (best for breadboards) or right angle pins (best for jumper wires). If you choose a board with soldered headers, you can use jumper wires to connect to Raspberry Pi, or other systems, without doing any soldering.

What does the air quality measurement mean?

The MS430 has a highly responsive metal-oxide sensor for volatile organic compounds (VOCs), a class of potentially harmful air impurities. Measurements from this sensor, together with humidity and temperature data, are input to an intelligent monitoring algorithm. This calculates an Air Quality Index value to describe the condition of the surrounding air. The value ranges from 0 to 500; lower values indicate better air quality.

How are air particulate measurements made?

The MS430 has an input connection and internal algorithms for analyzing the signal from a particulate matter sensor. This sensor is optional and must be purchased separately. There is a choice of two sensors: the Nova SDS011 and the Shinyei PPD42; both are available from many suppliers worldwide.

How do the sound and light interrupts work?

The sensor board has two digital output signals which are rapidly activated by changes in sound and light levels. The threshold level and behavior of these can be programmed by the host system. They can be used to trigger interrupts on the host, wake the host, or drive external circuits directly (e.g. LEDs).

Is it RoHS compliant?

The MS430 is compliant with the applicable requirements of the Restriction of Hazardous Substances (RoHS) Directive 2011/65/EU and former 2002/95/EC as amended by 2015/863/EU. This imposes strict limits on the amount of certain harmful chemicals (such as lead, mercury and cadmium) present in the product.