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Feb 06, 2018

While Waiting for Prototypes

I’m still waiting for the 4 prototype boards to come back from MacroFab. I think they got slowed down by Christmas/NY’s. But they should arrive next week! In the meantime I’ve added a few software/firmware features…

One is “highres” mode. When you want to read out slower than the sampling rate, e.g. to see a 10kHz signal, you want to sample every ~1000ns, not every 8 ns (the max 125 MHz). That means you could just skip 124 out of every 125 samples. But better yet would be to average those 125 samples! It reduces random noise. This is what highres mode does, which is a standard optional feature on scopes, and now can be used on the Haasoscope. Here’s what a 10kHz wave looks like with and without highres mode:

Persist display of channel 2 - highres.

Persist display of channel 2 - no highres.

It’s significantly cleaner using highres mode. I’ve made it the default for now, but you can turn it off if you want to.

Another feature is “XY” mode. This is also a standard scope feature, that lets you plot chan 1 vs. chan 2, instead of channels vs. time. If you select a channel on the Haasoscope now, and press “Y”, you’ll get a new window showing the XY plot of that channel and the following channel (e.g. if you click on channel 2 and do “Y” you’ll get an XY plot of channel 2 vs. channel 3). This lets you investigate many thing more easily, and play with the ever fascinating Lissajous figures!

XY display of channels 2 and 3.

Some more about these mesmerizing things here: https://www.youtube.com/watch?v=t6nGiBzGLD8

Till next time, Andy.

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USB-serial Adapter

This plugs into your computer (USB port) and then connects to the right side of the Haasoscope (serial RX/TX). It also can power the Haasoscope. You need one of these if your computer doesn't have a serial port, which is almost all modern computers. Arduinos and Raspberry Pi's do talk serial though - you can use them to read out the Haasoscope without an adapter!



This lets you reprogram the Haasoscope FPGA firmware from either Windows or Linux using the free Altera Quartus II software via the JTAG connector.


A Cool Screen!

This is a 0.96" 128X64 pixel white OLED screen. It communicates with the Haasoscope over an SPI interface, and can show ADC data from a selected channel, or whatever you tell it to! It can plug directly into the header above the FPGA.


Oscilloscope Probes

Two passive 100 MHz bandwidth oscilloscope probes for connecting to Haasoscope 100 MHz ADC inputs using BNC.


Opto-isolated USB-serial Adapter

For those of you probing some dangerous stuff, you can now act crazy without killing your laptop. This USB-serial adapter works just like the standard one, but is opto-isolated, for 1500V of protection!


High-speed USB Readout Board

In case 1.5 Mb/s is not enough bandwidth for you, grab one of these boards and have high-speed USB2 output from a Haasoscope! Using just 8+2 digital outputs on the Haasoscope, you can get about 4 MB/s, about 20x faster than serial, and still use the same python readout code. It's supported in the stock firmware too! Using 8+4 digital outputs, you could in theory even get up to 40 MB/s using C++ readout code and the free FTDI USB libraries.


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Andy Haas

I teach physics at NYU. I use electronics for research, in teaching, and as a hobby.

Andrew Haas

Seeed Studio

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