cuplTag is a battery-powered NFC tag that logs ambient temperature and humidity. Tap it with an NFC-enabled phone and you will see timestamped readings appear in a web application. It’s a one-step operation that requires no configuration and no app installation!
Tap cuplTag with your phone to see temperature and humidity in an instant. It works like this:
¹ Sensor readings are encoded in a ~1 KB circular buffer within the URL.
² The URL is written to a dual interface EEPROM using I²C, which is readable from a phone using NFC.
³ Time interval is configurable from 3 minutes to 65535 minutes.
The cuplTag system offers unparalleled ease-of-use in a low cost package. There are many uses for this zero-install sensor. Here are just a few:
Your cuplTag will be fully operable as soon as you insert a battery. cuplTags are pre-configured to display data using an instance of cuplfrontend that is hosted by our company, Plotsensor, Ltd. You are free to re-configure your tag so it uses your own instance of the cupldeploy web application.
Newly captured data are seamlessly stitched together with data from previous tag scans. You can easily see graphs of sample data with high temporal resolution by scanning cuplTag every few days.
The cupldeploy project is the parent of cupltag and the web application, which consists of cuplbackend and cuplfrontend. A tagged commit of cupldeploy represents a system version number (e.g. D3.7). Interoperable versions of each child project will share the same version number.
Authentication is important because tag data will be written to a database. In order to deter spoofing, each cuplTag ships with a unique and random secret key, which is used to generate an HMAC that is updated whenever the contents of the circular buffer change. (You can learn more about the specifics in our documentation). The HMAC is verified by the cupl web application, which knows the secret key. This feature prevents anyone without a cuplTag from generating a URL that appears to have come from one. The HMAC also guards against replay attacks, where a valid URL is obtained by a third party and fed to the web application more than once. It is highly unlikely that a cuplTag will produce the same HMAC twice.
For more detailed technical specifications, please see the cuplTag datasheet.
cuplTag is a system comprised of hardware, firmware, frontend software, and a backend web applications, all of which are open source. That includes:
Produced by cupl in Oxfordshire, UK.
Sold and shipped by Crowd Supply.
One cuplTag, factory configured to sample temperature and humidity at 10 minute intervals. Works with the cupldeploy platform. Requires a CR1220 battery (not included). Includes one 2x4-way 2.54 mm male header, one 1x2-way 2.54 mm male header, one 2-way 2.54 mm jumper, and printed instructions.
From the Crowd Supply Basics project.
A bundle of 40 multicolored, 7.8" (200 mm) long silicone-coated 24 AWG jumper wires with female terminations on each end. They are designed for use with standard pitch (.1", 2.54 mm) male headers.
From the Crowd Supply Basics project.
Includes the EZ-FET, a basic, low-cost MSP430 programming and debugging solution
An EVM for MSP430FRx FRAM development with onboard debug probe, Grove connector, and ambient light sensor.
From the Crowd Supply Basics project.
A full-featured programmer, spy-bi-wire debugger, and usb-to-serial converter for the MSP430
Connects any MSP430 MCU to a computer via USB for real-time, in-system programming and debugging. Includes a 14-conductor cable for board communication and a USB cable. Manufactured by Texas Instruments.
A hardware-based USB 2.0 monitor & trigger platform, controlled from Python
A better SPI adapter
A tiny, single-sided M.2 SDR board that you can operate easily using your web browser
