Ultrasound Imaging with Raspberry Pi

July 4, 2017July 2, 2017 fustiniADC, hackaday, hackaday prize, prototyping, raspberry pi, rpi, ultrasoundLeave a comment

Adam Fabio writes on the Hackaday blog:

Best Product Entry: A HSDK for Ultrasound Imaging

As an entry into this year’s Best Product portion of the Hackaday Prize, [kelu124] is developing a hardware and software development kit for ultrasound imaging.

Ultrasound is one of the primary tools used in modern diagnostic medicine. Head to the doctor with abdominal pain, and you can bet you’ll be seeing the business end of an ultrasound system. While Ultrasound systems have gotten cheaper, they aren’t something everyone has in the home yet.

[kelu124] is working to change that by building a hardware and software development kit which can be used to explore ultrasound systems. This isn’t [kleu124’s] first rodeo. HSDK builds upon and simplifies Murgen, his first open source ultrasound, and an entry in the 2016 Hackaday prize. [kelu124’s] goal is to “simplify everything, making it more robust and more user-friendly”.

The system is driven by a Raspberry Pi Zero W. A custom carrier board connects the Pi to the pulser block, which sends out the ultrasonic pings, and the analog front end, which receives the reflected signals. The receiver is called Goblin, and is a custom PCB designed [kelu124] designed himself. It uses a variable gain amplifier to bring reflected ultrasound signals up out of the noise.

High-speed ADC pHAT for Raspberry Pi

April 15, 2017April 13, 2017 fustiniADC, analog, DAQ, Data Acquisition, hackaday.io, raspberry pi, rpiLeave a comment

kelu124 designed this board to add high-speed analog inputs to the Raspberry Pi:

20Msps+ ADC RaspberryPi extension

We haven’t tapped yet into the full potential of the Raspberry Pi in terms of ADC. Some have shown that the first gen of Raspberry could go to 10Msps [..] My take is that the new Raspberry Pi’s can surely go above. And I want to try it, either with this old CA3306E or with more recent kick-ass ADCs.

https://hackaday.io/project/20455-20msps-adc-raspberrypi-extension-bomanz

The design files are available on GitHub:

kelu124/bomanz

14-bit 80MSPS ADC for SDR experiments

March 24, 2017March 22, 2017 fustiniADC, SDR, wirelessLeave a comment

Eric Brombaugh designed this ADC board for RF signals:

RXADC_14 Pmod

This is an ADC designed for use in digitizing RF signals with up to 40MHz bandwidth and 80dB SNR. The form-factor is compatible with a dual-connector Digilent Pmod so that it can be used with commonly available FPGA development boards to build a variety Software-Defined radio functions.

Features:

ADC14C105 14-bit 105MSPS RXADC.
Onboard 3.3V Regulator (5V input)
Filtered Analog 3.3V Supply
Onboard 80MHz clock oscillator
Digilent-compatible 2-connector Pmod interface
50-ohm SMA input – 2.5Vpp ~= 0dBfs

emeb has shared the board on OSH Park:

14-bit 80MSPS ADC for SDR experiments

831aa0bd88f188310e6a04a187a105ae

Hall Sensor Preamp

March 19, 2017March 8, 2017 fustiniADC, sensorLeave a comment

Piotr Zapart designed this board to overcome range issues when using traditional 300 degree potentiometers or Hall sensors as rotational angle to voltage converters:

HALL Preamp/Analog axis calibrator

The idea was to create a device that will perform an axis calibration, usually done in digital domain, but before sampling the signal in the ADC, still in analog domain, using it’s advantageous infinite resolution

the main function of this device is to:

Buffer the analog output signal coming from a potentiometer or another rotary angle to voltage converter like ie. Hall sensors.

Filter out the high band noise and limit the bandwidth to an usable range only, protect the input against voltage spikes.

Match the output voltage range of the source (pot/hall sensor) with the input range of the ADC, thus making the most of the available ADC resolution.

Linearize the hall sensor output signal response by amplyfing it’s most linear region to the full scale ADC input range.

The board is shared on OSH Park: