The Xprotolab Plain is the most inexpensive but feature rich oscilloscope in the market. It consists of a simple DIP module with a USB interface. Visualization of the signals and controlling the oscilloscope is done on the PC interface software (open source). The Xprotolab Plain is similar to the original Xprotolab, but doesn't have the display and buttons, so it only works with the USB interface. The board measures only 1 x 2 inches, and can be mounted directly on a breadboard. The Xprotolab can also be used as a development board for the AVR XMEGA microcontroller.

Features:

Mixed Signal Oscilloscope: Simultaneous sampling of analog and digital signals.
Advanced Trigger: Normal / Single / Auto, with rising or falling edge and adjustable trigger level.
Meter Mode: Average, Peak to peak and Frequency readout.
XY Mode:
Plot Lissajous patterns
See the phase difference between two waveforms
V/I Curve tracer with an external resistor
Spectrum Analyzer with different windowing options and selectable vertical log.
Horizontal and Vertical Cursors with automatic waveform measurements.
Arbitrary Waveform Generator with Sweep on all parameters.
Display options: Persistence, Different grid options, and more.

General Specifications:

ATXMEGA32A4U 36KB Flash, 4KB SRAM, 1KB EEPROM
Module size: 1.980" x 1.01"
PDI interface.
USB connectivity: Windows, Linux, MAC, Android
Logic Analyzer specifications:
8 Digital Inputs, 3.3V level
Maximum sampling rate: 2MSPS
Frequency counter: 16Mhz
Protocol Sniffer: UART, I2C, SPI
Internal pull up or pull down.
Buffer size: 256

Oscilloscope specifications:

2 Analog Inputs
Maximum Sampling rate: 2MSPS
Analog Bandwidth: 200kHz
Resolution: 8bits
Input Impedance: 1M?
Buffer size per channel: 256
Input Voltage Range: -14V to +20V

AWG specifications:

1 Analog Output
Maximum conversion rate: 1MSPS
Analog Bandwidth: 44.1kHz
Resolution: 8bits
Output current > +/- 7mA
Buffer size: 256
Output Voltage: +/- 2V
EDNHot100 The Xprotolab was awarded as one of the 100 Hot Products of 2011, by the EDN magazine.
All the parts are soldered with the exception of the headers.
Optional Accessories (soldering required):
PDI Programming Header: Only needed to do firmware debugging on the device.
Bluetooth Header: Only needed to hook up external devices, such as the Bluetooth RF Module.
Jumper Wires: Useful for breadboard prototyping, 6" male to male.
USB OTG Adapter: To connect to an Android device