Funding for this project was canceled by the project creator on March 30, 2013.
About this project
An 8 channels, 200ksps, 10 bit, data acquisition system for the Raspberry Pi for $35. The system supports AC/DC coupling, a programmable voltage range, and a variety of user options.
The RAS-DAS-1 software includes a Remote Scope Application and Remote Spectrum Analyzer which runs on Linux, Mac OS and Windows. There are command line utilities which run on the Raspberry Pi itself to capture data, as well as a server based program to allow you to capture data from across a network. The command line utilities are standard executables which can be called from any language (like Python, Perl, csh, sh, etc.). In addition, the software API is available so that you can program in C/C++.
Audio Explorer Card
Since the RAS-DAS-1 is capable of running at multi-channel audio rates, we created a multi-channel audio input card which includes 4 electret microphones, as well as 4 microphone inputs (3.5 mm jacks), plus the high gain amplifiers for microphone level signals. There are also 4 additional (un-amplified) connectors to RCA-style jacks as well as 3.5 mm jacks.
The enclosure allows provides for open access on all four sides so that the Raspberry Pi connectors are fully accessible, while allowing for good airflow and ventilation.
The Raspberry Pi is held in place from the mounting holes on the top (Currently only Rev B boards are supported). The transparent case allows for viewing the LED status indicator lights, while providing a significant amount of protection.
One or more accessory cards are held in place from the bottom. A ribbon cable connects the accessory card to the Raspberry Pi. The ribbon cable connection ensures there is no mechanical stress is ever placed on the Raspberry Pi's 26 pin GPIO connector.
When the enclosure is open, there is full access to the accessory card on the bottom.
Fun - Science Experiments
We think the Raspberry Pi would be an excellent way to engage students in science and math-related activities. With the Audio Explorer, RAS-DAS-1 and Raspberry Pi, students can perform science experiments like measuring the speed of sound, determining where a sound originated from, and use echoes to determine how far away a wall located.
Additional details, documentation, and information can be found on our web site here.
Note: We will ship to countries outside of the U.S. Details of tax, shipping options and fees are being explored, and will be provides later.
Risks and challenges
We need kickstarter funding to bring the RAS-DAS-1, and Audio Explorer to production. The hardware designs are completed. The software is nearly complete (95%). The main risks left are to
- secure a high quality, low-cost, manufacturer
- begin production, and ship units
Why do you only ship to the US? There are many people outside of the US that explore Kickstarter. Peter
In our kits, we were planning to supply a USB power supply with a US power plug. if the user could identify the type of power outlet they required, we might be able to do something. International Orders - please add $15 for shipping and handling.
We cannot claim that the RAS-DAS-1 is a "decent oscilloscope" as an oscilloscope has :
- much higher bandwidth (typically 100 MSPS)
- high bandwidth (read expensive) probes
- a variety of different trigger mechanisms
- filtering (bandwidth limitations)
- voltage and time cursors
That said, you can used it certainly to measure voltages, (and when used with the audio explorer, we can measure audio range sounds--20 to 20KHz).
Our intention is to improve the Remote Scope application to the point where it may one be good enough to use as a decent oscilloscope - at the 200 KHz sample rates.
There are some aspects we do a bit better than traditional oscilloscope software - mostly involving remote control and getting data out of the scope. (I personally use a Tek DPO 2000 series scopes, and I think they're great to use in the lab, but are also very slow to use via remote control - using the web interface).
If this project is successful, we would eventually release higher rate data acquisition cards (I'm thinking of 25-65 MSPS using high speed ADC's ,and FPGA's) - which will be controllable via a Raspberry Pi. But that's another story.
Naturally, we'll update our software, and make the protocols available so you could do your own if wanted, as well.
- (30 days)