Summary of Arduino V-USB / HID 14 channel data logger
This article guides users in creating an Arduino-based USB interface to log digital or analog data directly to a PC without modifying standard Arduino software. It details building a hardware circuit using V-USB, warns of potential risks like system damage from wiring errors, and provides instructions for installing the necessary library into the Arduino environment.
Parts used in the Arduino Data Logger:
- Arduino UNO or clone
- Solderless breadboard
- Perfboard
- USB connector
- V-USB library files (UsbKeyboard folder)
UPDATE: Please see Addendum 2 at the end of this article for an Excel automatic logging implementation.
There are several good articles on Instructables about building your own Arduino. Depending on your horde of electrical parts, you may be able to build an Arduino clone for as little as $3. I recently built two: one on a solderless breadboard and another that is like a USB-stick made on perfboard and my parts cost were approximately $7 (the breadboard parts were sacrificed to build the stick after I got all the hardware and software working.)
Once you get your CloneDuino built, or even if you purchase a commercial model such as the UNO (picture #5), then you need to do some programming for the next step down the path of creating something useful or fun. BUT, what if you could use the Arduino for gathering the state of digital or analog information and then log that data to the PC for later manipulation? This would mean that the Arduino software would not need to be changed (or perhaps only minor changes) to perform many experiments.
Step 1: Building the USB hardware interface
To connect a genuine Arduino UNO or a clone UNO to your PC USB port, you need to have an interface.
The interface built by rancidbacon for his tests is shown in the first picture.
http://code.rancidbacon.com/ProjectLogArduinoUSB
The schematic for the interface is shown in the second picture.
http://petrockblog.wordpress.com/2012/05/19/usb-keyboard-with-arduino-and-v-usb-library-an-example/
To be successful with this project, you will need to construct this circuit in some manner, either as shown here or as I showed in the previous section. While the construction is not complicated, errors will keep the V-USB software from working (said another way, the project will be a BIG flop and will not work.) Additionally, if you have a wiring accident, diode reversed, improper parts selection, or cold solder joints, the circuit is likely to not work. AT WORST, IMPROPER CONSTRUCTION AND WIRING COULD DAMAGE YOUR PC USB PORT, SYSTEMBOARD, OR CREATE OTHER SERIOUS AND EXPENSIVE DAMAGE.
DO NOT ATTEMPT TO BUILD THIS INTERFACE AND USE IT ON YOUR PC UNLESS YOU ARE CONFIDENT YOU CAN CONSTRUCT THE CIRCUIT PROPERLY AND HAVE THE ABILITY TO TEST YOUR INTERFACE BEFORE CONNECTING TO YOUR PC. IF YOU MOVE FORWARD WITH CONNECTING TO YOUR PC YOU ASSUME ALL RISKS ASSOCIATED WITH THIS PROJECT.
Step 2: Download the V-USB modified code
You will need to download the V-USB for Arduino library. This library is located here:
http://code.google.com/p/vusb-for-arduino/downloads/list
The code should be integrated into your Arduino environment in the library section. On my XP machine, the location is:
My Documents\Arduino\Libraries\UsbKeyboard
Adjust your location (directories) to match the install requirements for Arduino on Linux or iOS.
Download and expand the ZIP file. The ZIP file is structured as:
vusb-for-arduino-005.zip\vusb-for-arduino-005\libraries\UsbKeyboard
Only the files in the \UsbKeyboard folder and subordinate folders are required to be moved to
My Documents\Arduino\Libraries\UsbKeyboard
For more detail: Arduino V-USB / HID 14 channel data logger
- Can I build an Arduino clone for under $10?
Yes, depending on your parts, you can build a clone for as little as $3 or approximately $7. - What is the main purpose of this project?
The goal is to use the Arduino to gather state information and log that data to a PC for later manipulation. - Does the Arduino software need major changes?
No, the Arduino software would not need to be changed or perhaps only minor changes are required. - Where should I download the V-USB code?
You need to download the V-USB for Arduino library from the Google Code project page. - How do I install the library on Windows XP?
Move the files from the UsbKeyboard folder to My DocumentsArduinoLibrariesUsbKeyboard. - What happens if I wire the diode incorrectly?
Improper construction could cause the project to fail or potentially damage your PC USB port and system board. - Is it safe to connect this to my PC immediately?
No, you must be confident you can construct the circuit properly and test it before connecting to a PC.
