Introducing the LogIT
The LogIT Series consists of two unique circuit measurement tools which both display accurate readings of voltage, current, and power while also simultaneously logging all measurement data to a MicroSD card and/or PC.
Our motivation for creating the LogIT devices arose from the observation that in many cases a modern microcontroller based system such as a phone or an Arduino are powered by USB while connected to a PC that is also transferring data.
Looking more closely at the type of measurements made in product development and DIY experimentation, many of these measurements are made at low positive voltages and reasonably low current. Surprisingly there are very few metering tools that allow for a simple connection to the device being tested while still allowing data to pass through uninterrupted.
The LogIT devices are specifically designed to measure the low positive voltages of USB and Power over Ethernet (PoE) connected equipment with high accuracy.
The time between individual measurement data samples, collected inside the LogIT, can be measured at either standard or custom intervals ranging from a millisecond to hours.
At the heart of the LogIT is a 32bit ARM Cortex M0+ microcontroller which consumes tiny amounts of power while still managing to synchronize numerous simultaneous interactions between peripherals such as the SD card, display, serial data port, and sensing system.
Using a gutsy little processor has enabled the LogIT to support the writing of standard CSV formatted data to SD card with files sizes only limited by the SD card capacity. If you wish to log over 2GB of power, voltage, and current data in a single recording, potentially stretching for weeks, then a LogIT will help you achieve this.
We have worked diligently to create a device which not only connects to a PC but can also be operated as a stand-alone logger with a battery life of up to a week for fast recording rates and continuous measurement display. This is achieved by incorporating a large lithium polymer battery AND one of the latest high speed/low power display technologies called Memory LCD, developed by Sharp Microelectronics.
The display itself is a 128 X 128 pixel dot-matrix that allows for the representation of measurements both in numerical and graphical format simultaneously.
We have paid attention to the details when designing this tool. Inside each LogIT there is a realtime clock for accurate time-stamping of the data. When a LogIT is connected to a PC the devices time can be synchronised to your PC or you can manually set a time on the device itself. There is also a raft of additional features are common to both devices such as,
- Full isolation between the measurement ports and the test data USB/Serial ports,
- An open protocol for serial data streaming in both event and continuous modes,
- Screw terminals so that you can wire the LogIT directly into a circuit and test a wider range of voltages,
- Visual and audible buzzer alarm capabilities for indication of events set as thresholds by the user for current, voltage, or power, and,
- A low voltage serial port connector for direct connection to a DIY embedded devices such as an Arduino or Raspberry Pi.
The PoE version includes a multitude of additional circuitry to allow for 2 channels of data measurement at a higher resolution. This unique device supports every PoE power standard all the way up to PoE++ for over 90W of accurate power measurement.
For those who develop or use a Power over Ethernet (PoE) based class of products there is nothing remotely like this tool with respect to the combination of affordability and supported features.
We hope to make available an additional breakout board accessory, connectable by patch leads, so that the PoE model of LogIT device can utilise 2 sets of screw-terminal based connection. Users will then be able to harness 2 channels of simultaneous power measurement when wired into a test circuit.
We believe that we have designed some of the best USB & PoE power monitors in the world with regards to features and would like to work with a community to make our a belief a shared reality.
With simplified methods of connection to standard embedded devices it is likely that you will learn more about what is right or wrong with your circuitry a lot quicker and with greater detail.
Basically, we think these devices will be a great little tool to have in the toolbox whether you are a professional engineer or an electronics enthusiast.
The Desktop Application
We have created a FREE desktop application, coded in Java so that both Mac and PC users can connect, graph, and download data from the LogIT devices.
Each LogIT has a fully isolated debug port which provides power to the device for charging the internal battery while also helping to protect your PC from damage due to voltage spikes/offsets and noise created by the device you are testing.
The fully functional BETA software incorporates a simulation mode for you to play around with before you even get a LogIT!
Please feel free to download the Mac and PC software HERE (External link).
The LogIT series is the product of an enthusiastic and experienced design team based in Melbourne, Australia who have led many other projects to market for various companies.
The team has significant experience in developing medical, consumer, clean technology and energy efficiency products. The following people have helped bring this project to life.
- Video Production - Good Studio
- Music - Echosonica, Ticking Away
- T-shirt Illustration - INNI
- T-Shirt Printing - While You Sleep
We are strongly motivated to Kickstart this project so that we can make the LogIT readily available to a wide audience of electronics enthusiasts and product developers.
If we reach our primary goal this will allow us to ship a USB or PoE LogIT device includes the following,
- A fully assembled and tested LogIT with Injection Moulded housing
- 2 x screw terminal plugs (USB Model ONLY)
- A small micro-USB cable
- Recyclable packaging
All manuals and instructions will be available for download from the Tektyte site when we ship.
Any additional stretch goals reached will help us to deliver further enhancements such as professional injection moulded plastic housings (reached 10.02.2015). See the stretch goals section for more details.
We have designed a t-shirt and hope to work with a lovely bunch of local screen printers that are willing to make these tees using high quality American Apparel garments.
A sample of the design can be found in the video below.
Following the Kickstarter we will send out an email asking what your preference is for a fine jersey short sleeve male or female t-shirt size.
For anyone who supports our project here in Melbourne by getting a T-shirt or LogIT device we would like to extend an invitation to an exclusive celebratory gathering in late March which includes free drinks, a chance to see were these devices are designed, wrap your hands around the prototypes, and talk with the engineers involved.
For those who are overseas we have altered the shipping cost of the T-shirts and they now include free shipping!!
The following is a list of the ways we will make these devices better with any funds provided beyond the initial goal. It is our hope that with your help we can afford injection moulding, further resources which can be dedicated to the improvement of calibration processes, software interface libraries, and better overall documentation.
The timeline we have put together for what happens after the Kickstarter is a guide shared with you so that you can be assured we delivery to a schedule. Depending on the final goal achieved by the Kickstarter there may be some variation. Having said this, at the end of the day we just want to get these tools to you as soon as humanly possible.
Risks and challenges
Having built and tested these devices over the last year, many of the project risks have been minimised but the following items need to be addressed before delivery
- Plastics injection mould tooling (if stretch goal is reached)
- Manual creation
- Formalised Protocol documentation
Each LogIT device is already configured to accept remote firmware update via USB if necessary and the desktop software, while already working on Mac and PC platforms will be developed further with the help of additional resourced and your feedback before it is release from BETA.
The hardware has been tested extensively during the last year but we will be diligently quantifying noise and measurement limits so that you can work with a LogIT and be confident about it's performance as a critical measurement instrument.Learn about accountability on Kickstarter
- (40 days)