Inverse-kinetics is an equation that will calculate the reactivity value for the reactor (in terms of cents). The meter should start when the reactor is critical.
To change the signal from a current chamber use a picoammeter or current amplifier. There is usually an analog voltage output for the range. The signal is usually inverted. Invert the signal using an op-amp.
For a pulse detector us a rate meter to obtain an output voltage. Some resistors may be required to change the 0-10V output to 0-3.3V.
Program the micro-controller to sample the voltage. Filtering the data is recommended
Use the inverse-kinetics equation to determine reactivity.
Filtering the reactivity output is also recommended.
For my project I sent the data out to an OLED screen for display and I also sent it to LabView where it can be stored.
The code is attached in the documents. An additional header file was used to change a float to string. I got the header file from the Arduino playground. I'm sure there is a better way to do it but I couldn't figure it out because I'm new to C++. I also attached a picture of the labview program. The output from the micro-controller to the computer uses a comma to separate the reactivity value and timestamp.