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.
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.
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:
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:
We need your help to prove that OpenLogger is a desirable concept, so we can continue development.
The Screw Terminal Adapter provides an additional connection option. It mounts solidly on top of the OpenLogger and provides the following:
|Software Experience||Browser software or mobile application||Serial communication||Wi-Fi access point or Bluetooth application||Python libraries|
|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|
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.
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.
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)