OpenLogger

by Digilent

A high-resolution, Wi-Fi enabled, open source, portable data logger

$1,732 raised

of $10,000 goal

17% Funded

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$109

OpenLogger

This package includes one OpenLogger, one microUSB cable, and one set of female terminated flywires.


$124

OpenLogger with Screw Terminal Adapter

This package includes one OpenLogger, one microUSB cable, one set of female terminated flywires, and one Screw Terminal Adapter.


$134

OpenLogger Deluxe Kit

This package includes one OpenLogger, one microUSB cable, one set of female terminated flywires, one Screw Terminal Adapter, one 8 GB microSD card, and one Project box

Details

Recent Updates


Engineers, scientists, and enthusiasts often need to collect data from a design or subject over a long period of time. Data loggers provide this functionality, but often come with restrictions that hinder or even stop development progress. OpenLogger is a portable, low-cost, high resolution data logger designed to provide high quality measurements without requiring expensive software or writing software from scratch.

Most data loggers require users to choose between live data visualization while physically connected to a PC or blind logging to local storage. OpenLogger features both Wi-Fi and USB connectivity in addition to a microSD card for storage. This enables users to stream data for real-time visualization via Wi-Fi or USB, log data to the SD card, or both at the same time. When a physical connection to a computer is impossible or risky, a wireless connection is a must. OpenLogger streams data through Wi-Fi or USB to browser-based software called WaveForms Live. This software is free of charge, open source, and available to try now at WaveFormsLive.com.

Data logger in action

While the software experience and connectivity are extremely important, we also wanted to provide premium data collection. Utility of data is primarily impacted by resolution, sample rate, number of channels, and accuracy. OpenLogger provides sixteen bits of resolution (65,536 different values), sampling rates up to 500 kS/sec, eight analog input channels, and is accurate to better than +-10 mV.

Who Needs It and Why?

OpenLogger is a proof of concept for a low cost, easy to use Wi-Fi enabled data logger. We believe it is the right solution for users who need an untethered data logger, without paying for expensive software or building their own software from scratch.

The OpenLogger was first conceived by one of our engineers with a passion to push the boundaries of ADC and DAC technology with the PIC32MZ. While researching the technology, we realized that we had something truly unique; there isn’t anything quite like the OpenLogger in the current market. We want to build on this proof of concept to enable scientists, engineers, and enthusiasts to take on larger challenges and accelerate the pace of their discovery.

Wi-Fi connectivity lets users remain electrically isolated from the device under test, or connect to a mobile platform, such as a car, where a cable connection is not an option. This combination of features makes OpenLogger a great choice for a wide range of applications, for example:

  • A mechanical engineer measuring the g-force on a mobile robot can take advantage of wireless connectivity and browser-based software to get up and running quickly, visualizing live data remotely.
  • An electrical engineer measuring the hot spots on a circuit board can place temperature probes in eight different places on the board and log data to an SD card for accurate measurements over time.
  • An electronics enthusiast at home can connect the OpenLogger to a current probe and measure the power usage of each circuit in their house while keeping their PC electrically isolated from high currents and taking advantage of the embeddable nature of the OpenLogger.

What Can You Do with OpenLogger?

Since OpenLogger is a flexible logger that doesn’t require a tethered connection and can be connected to virtually any analog sensor, the possible applications are truly endless. For example:

  • Monitor the power usage of the different circuits in your house to check for unexpected power use.
  • Measure and plot the stress on various parts of a structure.
  • Set up a health monitoring system with some electrodes, air pressure sensors, and tubing to monitor heart rate and respiration.
  • Attach the OpenLogger to a robotics application and stream data from sensors and motors while in motion!
  • Monitor the temperature of various sections of a board inside an enclosure to test for hot spots.
  • Create a fish tank monitoring system that monitors water temperature, water quality, and water flow to keep an eye on the health of your tank.
  • Measure and plot the temperature change of various parts of your Thanksgiving turkey. You’ll be able to see and analyze the different rates that the leg, breast, wing, or stuffing cook over time.

We need your help to prove that OpenLogger is a desirable concept, so we can continue development.

Features & Specifications

  • Analog Inputs
    • Eight channels
    • 16-bit resolution
    • 50 kHz Analog Bandwidth
    • Log up to 500kS/sec to microSD card
    • Stream up to 200kS/sec via USB
    • Stream up to 10kS/sec via Wi-Fi
    • +-10 V input, protected up to 30 Vpp
  • Analog Output
    • One channel
    • 10-bit resolution
    • 1 MHz bandwidth (-3 dB)
    • 10 MS/s sampling rate
    • 3 Vpp
    • Sine, triangle, sawtooth, square, and DC outputs
  • Eight Digital I/O
  • Power Supplies
    • Two channels
    • +/- 4 V, 50 mA per channel
  • Other I/O
    • Program button
    • Reset button
    • microSD card slot
    • microUSB connector
  • Connection Options:
    • The on board 2x18 male pin header provides easy access to all I/O via female breadboard wires or the included flywires
    • The optional Screw Terminal Adapter turns header access into screw terminal access
  • Free Software - WaveFormsLive.com
    • Can be used with or without an internet connection
    • Supported on Chrome, Safari, and Firefox
  • Microcontroller: Microchip PIC32MZ2064DAG169
  • Wi-Fi Module: Microchip ATWINC1500
  • Powering Options:
    • 5 V via the microUSB connection
    • 5.5 - 17 V from a power supply or external batter - either through the barrel jack or 2 pin power header

Screw Terminal Adapter

The Screw Terminal Adapter provides an additional connection option. It mounts solidly on top of the OpenLogger and provides the following:

  • Screw terminal access to the analog inputs, analog output, power supplies, digital I/O, 5 V and ground.
  • Male pin access to trigger in and out, program and reset, and ground.

Comparisons

OpenLogger Logomatic Sensything OpenDAQ
Manufacturer Digilent SparkFun ProtoCentral OpenDAQ
Software Experience Browser software or mobile application Serial communication Wi-Fi access point or Bluetooth application Python libraries
Connectivity Wi-Fi/USB USB Bluetooth/USB/Wi-Fi USB
Analog Input Channels 8 single ended 8 single ended (shared with digital I/O) 4 single ended/ 2 differential 8 single ended or differential
Analog Sample Rate 400kS/sec Not specified 2kS/sec 10kS/sec
Analog Resolution 16-bit Not specified 24-bit 14-bit
Input Range +-10 V Not specified +-2.5 V +-12 V
Digital I/O 8 digital I/O 8 digital I/O (shared with analog) 4 digital I/O, 2 I2C ports 6 digital I/O
Analog Outputs 1 channel No No 1 channel
Power Supplies 2 channel, +- 4 V No No No
Open-ness Open source Open source Open source Open source firmware
Price $109 $59 $95 $226

Manufacturing Plan

To make sure that we can fulfill our campaign promises, we are working with a manufacturer who has a long-standing record of providing us with quality hardware. Currently, we have received and validated finished prototypes, so all that’s left is to reach our campaign funding goal so we can hit start on manufacturing our limited run for our Crowd Supply backers.

Shipping & Fulfillment

We’ll be using Crowd Supply’s fulfillment services, so everything will be shipping from Portland, Oregon. Most shipping and fulfillment questions are answered by this useful page about ordering, paying, and shipping.

We want to make sure that OpenLogger is available to everyone, but unfortunately shipping internationally from the US is expensive and complicated. Because of this, we must include an international shipping fee for backers outside the US.

Risks & Challenges

OpenLogger is a low risk project. We have created a small batch of hardware prototypes and confirmed that the hardware performs as we expect. We’re using software that already works with an existing product and just need to complete manufacturing and stitching the pieces together. There are some inherent risks with Wi-Fi, those being that the performance of some features depend on network connection. There is also some risk in the timeline as we’re pushing the PIC32 to perform aggressively. While we are confident that we can achieve all promised functionality, the firmware is still under development so some features may be implemented after hardware is shipped. We have built a firmware upgrade system into the software, so all backers can update firmware on their hardware as soon it’s available.

There are always small risks in manufacturing and sourcing parts, but we have a track record that shows we can get it done. Any issues or delays will be communicated through backer updates.

Funding ends on Dec 19, 2018 at 03:59 PM PST (11:59 PM UTC)


Credits

Digilent

Digilent Inc. is a leading electrical engineering products company serving students, universities, and OEM's worldwide with technology-based educational design tools. Based in Pullman, Washington, Digilent designs, manufactures, and distributes its products on a worldwide basis.


Keith Vogel

Hardware/Firmware Engineer

Sam Kristoff

Software Engineer

Andrew Holzer

Software Engineer

Kaitlyn Franz

Alyssa Holzer

James Colvin

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