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15% Funded
15% Funded
2 Backers
20 Unit Target
Ends 5 Days After Target

+ shipping

3 reserved of 20 Minimum
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Product Details

J&J Studios
Mfr. Part #
Product Description

URI command syntax. JSON encapsulated data packets. The ideal weather sensor for your next IoT project.

The datum-Weather sensor combines the same SAMD21G18 microcontroller used on the Arduino Zero with the BME280 environmental sensor from Bosch Sensortec to create the simplest, easiest to use weather sensor for your application.

The datum-Weather sensor emulates a serial port over a USB connection, presents the information and data stored on it in a JSON formatted packet, and processes URI style commands to change and retrieve its settings. The datum-Weather sensor bridges the gap between a LEGO® Mindstorms® sensor and a breakout board.

alt text datum-Weather


  1. a piece of information
  2. a fixed starting point of a scale or operation


  1. the state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.


  • Atmel SAMD21G18 microcontroller
  • Bosch Sensortec BME280 environmental sensor
  • Onboard EEPROM settings storage
  • URI style command interface
  • JSON formatted data packets
  • Globally unique 64 bit UUID
  • Mounting holes in all four corners
  • 1.0" x 1.75" (25.4 mm x 44.4 mm)

Control the behavior of the sensor by using URI style commands right from your favorite terminal program. Want to set the report rate to 10 Hz and send the reports automatically? The following command does just that.

  set /config?reportRate=10&automaticReporting=true

Not sure what the settings for the temperature sensor were? The following command will retrieve them in a JSON formatted data packet.

  get /sensor/temperature/config

    "enabled": true,
    "units": "C",
    "filterType": "mean",
    "sampleRate": 5,
    "dataRate": 1

The data from the datum-Weather sensor is also encapsulated in a JSON formatted packet. This results in human readable text that is still easy to parse with your favorite programming language. An example of the output is shown below.

    "timestamp": 352.001,
    "temperature": {
      "time": [350.6, 351.6],
      "temperature": [26.63574, 26.63965]
    "humidity": {
      "time": [348, 349],
      "humidity": [34.05078, 34.04102]
    "pressure": {
      "time": [348, 349],
      "pressure": [14.45278, 14.45191]
    "altitude": {
      "time": [348, 349],
      "altitude": [140.4521, 140.9053]

The datum-Weather sensor can do much more than just collect the data. The measurement units can be customized to suit your application. Temperature data can be returned in degrees Farenheit or Celsius. Altitude could be in meters or feet. The datum-Weather sensor does all the calculations for you.

It can also apply filters such as min, mix, mean, and RMS to the data stream. This truly makes the datum-Weather sensor a smart sensor that goes far beyond what a breakout board can do. The datum-Weather sensor is also programmed with an Arduino compatible bootloader allowing full customization of the firmware.


Why GroupGet?

J&J Studios is focused on making it easier for students and hobbyists to integrate sensors into their projects. For someone new to electronics a breadboard, jumper wires, breakout boards, and header pins can be intimidating. Many people are already familiar with a URI syntax for getting and setting parameters and receiving data in JSON encapsulated packets. Therefore our products focus on translating the language a sensor speaks into that more familiar format. J&J Studios is breaking the barrier between a LEGO® Mindstorms® sensor and a breakout board.

Purchase Information

Unit Deliverable
One datum-Weather sensor board.
Unit Price
Campaign Part #
Campaign unsuccessful, ends when minimum unit count reached
Factory Lead Time

40 units will be available on November 26th. Any additional units ordered over that amount will have a 4 week lead time. Days

Shipping Details
GroupGets will handle the shipment of orders for this product.

How it works

This is a group buy campaign that needs to acquire at least the stated minimum amount of pledges from backers like you before the Unit Deliverable and any Add-Ons ship. We do not charge anyone until the Progress above hits 100% or greater, otherwise there is no charge. All campaign products are vetted as existing and functional so your order will be fulfilled within the Factory Lead Time if the campaign succeeds. Please see our FAQ page for more details on our billing process.

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