# Urban Board
The **Urban Board** is a passive board that contains a selection of low-cost sensors for environmental monitoring, and a connector for a PM sensor. The [measurements](#sensors) it takes depend on the version, but overall, it is capable of measurements such as:
- Temperature and Relative Humidity
- Barometric Pressure
- Noise Level and Frequency Spectrum
- Light (including UV-index after the 2.2 version)
- Air Quality Indicators (depending on the version)
- PM
The **Urban Board** has undergone several modifications throughout its development, and its current version is the **V2.3**. Below you can see all versions:
=== "SCK2.3"
=== "SCK2.2"
=== "SCK2.1"
Check the design files
## Assembly
The **Urban Board** connects to the [Data Board](https://docs.smartcitizen.me/hardware/boards/data-board.md) with the connector labeled `SENSOR BOARD`:
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### PM sensor connection
=== "SCK2.3/2.2"
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=== "SCK2.1"
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!!! info "Custom cable"
Note that the PM cable, both for PMS5003 or the SEN5X, are custom made.
## Sensors
=== "SCK 2.3"
| Measurement | Units | Sensor |
|----------------------------------------------|------------------------------------------------|-----------------------|
| Air temperature | ºC | Sensirion SHT-31 |
| Relative Humidity | % REL | Sensirion SHT-31 |
| Noise level | dBA, dBC or dBZ | Invensense ICS-43432 |
| Ambient light | lux | Rohm BH1730FVC |
| Barometric pressure | kPa | NXP MPL3115A2 |
| UV-A, B, C | uW/cm2 | AMS AS7331 |
| PM1, PM2.5, PM4 and PM10 | µg/m3 | Sensirion SEN5X |
| NOx Index, VOCs Index (Optional) | - | Sensirion SEN54, 55 |
=== "SCK 2.2"
| Measurement | Units | Sensor |
|----------------------------------------------|------------------------------------------------|-----------------------|
| Air temperature | ºC | Sensirion SHT-31 |
| Relative Humidity | % REL | Sensirion SHT-31 |
| Noise level | dBA, dBC or dBZ | Invensense ICS-43432 |
| Ambient light | lux | Rohm BH1730FVC |
| Barometric pressure | kPa | ST LPS33K |
| UV-A, B, C | uW/cm2 | AMS AS7331 |
| PM1, PM2.5, PM4 and PM10 | µg/m3 | Sensirion SEN5X |
| NOx Index, VOCs Index (Optional) | - | Sensirion SEN54, 55 |
=== "SCK 2.1"
| Measurement | Units | Sensor |
|----------------------------------------------|------------------------------------------------|-----------------------|
| Air Temperature | ºC | Sensirion SHT-31 |
| Relative Humidity | % REL | Sensirion SHT-31 |
| Noise Level and Spectrum | dBA, dBC or dBZ | Invensense ICS-43432 |
| Ambient Light | Lux | Rohm BH1730FVC |
| Barometric pressure and AMSL | kPa and Meters | NXP MPL3115A2 |
| eCO2 and TVOC | ppm/ppb | AMS CCS811 |
| PM1, PM2.5 and PM10 | µg/m3 | Plantower PMS5003 |
## Design files
You can find all the design files for the different versions of the Urban Board in the [hardware repository](https://github.com/fablabbcn/smartcitizen-kit-2x/tree/master/hardware).
Check the design files
!!!info "Previous versions"
Previous versions of the SCK, are in their respective repositories:
- Smart Citizen Kit 2.0: https://github.com/fablabbcn/smartcitizen-kit-20
- Smart Citizen Kit 1.5: https://github.com/fablabbcn/smartcitizen-kit-15