While our 1o1 Oscilloscope explored how much cool could fit in a square inch, my colleagues and I wanted to see instead how much power we could pack into something just a little bigger. The Probe-Scope is the result: a 250Msps, 60MHz single-channel USB oscilloscope. It's built on a PIC32MZ EF microcontroller, a MachXO2 FPGA, an AD9481 ADC, as well as extended sample memory and a fully-featured analog frontend designed by Mark. We created the Probe-Scope for the "Hackaday Prize 2019"; while we weren't able to fully realize the capabilities of the hardware in the time we had for the project, it is fully open-source, so anyone can pick up where we left off.
James Rowley (digital design, test board layout, firmware development)
Mark Omo (analog design, test board layout, software development)
Kempton Hall (final board layout)
Bonus video: a quick look at how our hand-built prototypes get made.
The Probe-Scope was developed as two modules, analog and digital, consisting of two prototype boards each:
- Digital Test
- Single-Ended to Differential Converter (to test the digital test)
- Analog Frontend (main)
- 30x Input Divider
These prototypes were all assembled by hand at our office. The final boards were assembled by PCBWay using an automated process. As an insight into how far we packed down the electronics, the prototype boards had a combined area of roughly 130cm^2, while the final board took up only 14cm^2.