Manifold Problem

The manifold that was ordered is meant for SY valves and is apparently incompatible with VQ valves. The pressure, return, and outlet lines are in a different order within the valves, as per their datasheets:

Updated quadrature sweep

Soldered Vcc to the node determined by Dr. Palermo. Fixed the random 5 MHz update at the end, and adjusted the formula to make each frequency pretty much exact (within 1%). Moved all the frequency updating and impedance reading to a timer interrupt, so there's now room in the main loop for pressure control.

Quadrature Sweep Video

After 10 MHz it goes to 5 MHz for some reason, I'll have to look into that.

Pressure sensor and reservoir testing

Last week, Taylor and I tested the pressure sensor (PSE 532 M5) and the centrifuge reservoir. The pressure sensor works well and gives very stable readings. The rate of change of pressure (positive and negative) were calculated and will be used for calibration.

Updated LabVIEW Interface once again

Today I made an Arduino program and corresponding LabVIEW program to display pressure over time received from the pressure sensor. This will be used tomorrow to plot how the pressure changes in the reservoir when we open and close the valve to the pressure line.

The LabVIEW interface has been updated again, and I moved all the magnitude and phase calculations from the Arduino to LabVIEW. Now the Arduino simple takes the measurement and sends that raw 12-bit number to LabVIEW for processing and display.

Programmed the AD9850 eval board

The AD9850 has been programmed to do a logarithmic frequency sweep from 10 kHz to 10 MHz. A million times easier than the old frequency generator.