Our RedBoards are great. But don't they sometimes seem a little BIG?!

Enter smôl, a new range of boards which are both small in size and small on current draw. It's a smôl world!

The smôl Environmental Peripheral Board brings three versatile, low-power sensors to your smôl ecosystem:

• BME280 - Pressure, Humidity and Temperature sensor
• SGP40 - VOC Air Quality sensor
• VEML7700 - Ambient Light (Lux) sensor

smôl is an ecosystem of miniature processor boards, peripheral boards, power boards and accessories. Designed to be both physically small and to have the smallest possible current draw, smôl is the perfect choice for applications like wildlife tracking or discrete long-term monitoring. smôl boards are designed to stack one on top of the other, using 16-way 0.5mm-pitch Flexible Printed Circuits (FPCs) to provide the interconnect from one board to the next. Looking for a really compact solution for your next project? This is it!

We will be adding new smôl boards over the coming months. Don't see the board you need for your application? Reach out to us via the SparkX Forum and tell us which board(s) we should add next!

BME280 Pressure, Humidity and Temperature sensor:

• Typical current consumption:
  • Humidity measurement: 340µA (Typ)
  • Pressure measurement: 714µA (Typ)
  • Temperature measurement: 350µA (Typ)
  • Standby: 0.2µA (Typ)
  • Sleep: 0.1µA (Typ)
• Temperature Range:
  • Full Accuracy: 0°C-65°C (32°F-149°F)
  • Operational: -40°C-85°C (-40°F-185°F)
• Humidity Range: 0-100% RH
• Pressure Range: 300-1100 hPa (30,000-110,000 Pa or approx. 4.35-15.95 PSI)

SGP40 Air Quality sensor:

• Typical current consumption:
  • 2.6mA during continuous operation (at 3.3V)
  • 34µA when idle (heater off)
• Output signal:
  • Digital raw value (SRAW): 0 - 65535 ticks
  • Digital processed value (VOC Index): 0 - 500 VOC Index points
• Switch-on behavior:
  • Time until reliably detecting VOC events: <60s
  • Time until specifications are met: <1h
• Recommended sampling interval:
  • VOC Index: 1s
  • SRAW: 0.5s - 10s (Typ. 1s)

VEML7700 Ambient Light sensor:

• Typical current consumption:
  • Operation: 45µA (Typ) (100ms refresh time)
  • Shutdown: 0.5µA (Typ)
• High accuracy ambient light sensor:
  • High sensitivity photodiode
  • Low noise amplifier
  • 16-bit A/D converter
  • I²C bus communication interface
• Measurement range:
  • 0.01 lux to 167000 lux
• Resolution:
  • 0.005 lx/ct,

smôl Specifics:

• Interface: I²C
  • BME280 Address: 0x76
  • SGP40 Address: 0x59
  • VEML7700 Address: 0x10
• GPIO:
  • None

Properties:

• Length: 1.60" (40.6mm)
• Width: 0.42" (10.7mm)
• Height: 0." (mm) max.
• Weight: g (0.0oz)
• PCB thickness: 0.8mm

smôl Environmental Peripheral Board Documentation:

• Schematic
• Eagle Files
• GitHub Hardware Repo

BME280 Documentation:

• BME280 Datasheet
• SparkFun BME280 Arduino Library

SGP40 Documentation:

• Sensirion SGP40 Datasheet
• Sensirion VOC Index for Experts
• Sensirion SGP40 Design In Guide
• SGP40 Quick Testing Guide
• SparkFun SGP40 Arduino Library

VEML7700 Documentation:

• Vishay VEML7700 Datasheet
• Vishay VEML7700 Application Note
• SparkFun VEML7700 Arduino Library

smôl Documentation:

• smôl Hookup Guide