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The Pax Instruments T400 is a simple, accurate, inexpensive, open source, four-channel temperature datalogger.
The Pax Instruments T400 is a simple, accurate, inexpensive, open source, four-channel temperature datalogger.
126 backers pledged $13,627 to help bring this project to life.

About this project

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T400 prototype with 3D printed case.
T400 prototype with 3D printed case.

Pax Instruments T400: first of a new class of affordable lab instruments

A Little History

A few years ago, I was engineering a new product and trying to log the temperature at multiple points within my device. I found myself needing a device that could log several temperatures at the same time, for many hours, and could work reliably without me needing to keep a close eye on it.

But, when I looked around for something to meet my needs, the options were slim: I could spend close to a thousand dollars on a very expensive, proprietary lab instrument with limited capabilities, or I could spend my time rather than my money and create a specialized system using an Arduino™.

So, with help from a few friends, I set out to solve this problem by creating an easy-to-use “plug and play” device that’s more than accurate enough for most purposes, yet still has the flexibility of an open system. After many months of careful designing, I’m thrilled to introduce the result of our efforts: the T400 Temperature Datalogger!

About the T400

The T400 comes ready to use out of the box with everything you need to track and record the temperature of a solid, liquid or gas: just plug in one of the provided thermocouples and turn it on. You can read the temperature measurements directly on the T400’s LCD screen.

The T400 can stream live data to your computer via USB. But don’t worry about connecting the T400 to another device: all of the data is logged directly to a MicroSD card, so it works independently of other devices. The long battery life on the T400 means that you can set it up, walk away, and come back when that work is done, all of your recorded data will stay safe and sound on the SD card.

Features

The high-level features of the T400 are listed below. If you would like a detailed look under the hood, visit the T400 source files on Github.

  • ATmega32U4 microcontroller
  • 132x64 pixel LCD display with blacklight
  • Internal BL-5C LiPo battery with USB charging
  • MicroUSB for streaming data to a computer
  • MicroSD card included for recording data to .csv (FAT16 only)
  • Compatible with industry standard mini-TC connectors
  • MCP9800 junction temperature sensor
  • MCP3424 ADC for measuring thermocouple voltages
  • DS3231 RTC with backup battery to trigger readings while processor is in sleep mode
  • Molded enclosure

What is the T400 Used For?

The T400 is the perfect tool for any project that needs close temperature monitoring:

  • Science experiments

  • Long term environmental data collection in the field

  • Home brewing

  • Barbecue (hot- or cold-smoking!)

  • Sous vide cooking & food safety

  • Live thermal process monitoring in the lab

  • And more!

And, because the T400 is based on the open source Arduino™ Leonardo platform, it can easily be modified to your specific needs. SPI and i2c pins are broken out for expandability and uses we haven’t thought of yet.

Your support will allow us to take the T400 from the prototype stage into full production. But that’s just the start: if the T400 is a success, we plan to begin development on a full line of affordable, open-source lab equipment.

We can’t wait to see the kinds of projects that the T400 makes possible.  Thank you!

Risks and challenges

Manufacturing any hardware has a set of inherent risks - cost overruns, part shortages, and production delays are always possible. However, we’ve worked hard to minimize these risks; we have several options for production, and our prototype is complete, even including functional firmware. We’re confident that we can make the T400 a reality.

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  1. Select this reward

    Pledge $1 or more About $1.00

    Thank you!

    Our gratitude for your show of support, updates on the future of Pax Instruments.

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    Pledge $125 or more About $125

    T400 Basic Kit - Early Bird!

    You will receive one T400 datalogger, one battery, one MicroSD card, four general-use Type K thermocouples, one MicroUSB cable, and one USB wall adapter, at a special price for the earliest adopters.

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  3. Select this reward

    Pledge $140 or more About $140

    T400 + basic kit:

    You will receive one T400 datalogger, one battery, one MicroSD card, four general-use Type K thermocouples, one MicroUSB cable, and one USB wall adapter, at a price available only on Kickstarter.

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    Pledge $145 or more About $145

    T400 + Extended thermocouple kit - Early Bird!

    You will receive all the rewards of the basic kit plus four additional general-use Type K thermocouples, four Type K thermocouple stainless steel probes, eight male mini thermocouple wire connectors, eight female mini thermocouple wire connectors, and ten meters of thermocouple extension wire, all at a very special price for early backers.

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  5. Select this reward

    Pledge $160 or more About $160

    T400 + Extended thermocouple kit:

    You will receive all the rewards of the basic kit plus four additional general-use Type K thermocouples, four Type K thermocouple stainless steel probes, eight male mini thermocouple wire connectors, eight female mini thermocouple wire connectors, and ten meters of thermocouple extension wire, and still for less that the retail price of the T400.

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Funding period

- (30 days)