Spectrum analyzer based on TIVA Lanchpad Series

Gabriel Francisco has been working on low frequency spectrum analyzer. It was meant to analyze accelerometer data gathered from automotive suspension system to measure comfort of the ride. But this analyzer can be used for any low frequency signals. Basically this measuring system consists of Graphical User Interface (GUI), data acquisition hardware based on LM4F120 TI’s ARM Cortex-M4 and data source – accelerometer. Logic analyzer support 8 channels with 512Hz sampling frequency. Data is passed through software FIR low pass filter with 75Hz cuttoff frequency. Then it calculates 256 points FFT, Power Density Spectrum. Graphical interface has several handy controls and signal ploting. Gabriel have made additional custom board for better connectivity and also designed whole custom PCB which seems hasn’t been built yet. Continue reading

Ti launchpad runs a spectrum analyzer

This is great project for you if you make RF related projects. Working with signals is much more easier when you see them – especially if these are high freq. When building RF embedded applications you usually use standard modules that have standard frequencies like 433MHz, 868MHz and so on. So why not to use one of these modules to analyze spectrum of close frequencies. It can be done by using one of cheap RFM12B modules which can be easily interfaced to MSP430 MCU via SPI interface. Module frequency can be configured in steps depending on bandwidth chosen. Currently spectrum analyzer is set to read 916MHz bandwidth with sweep of 241 120kHz steps. And this is right all that TI Launchpad USART 9600bps bottleneck allows. USART sends sends spectrum data to Perl visualization script where graphs are nicely seen along some effects like Peak Hold or Zooming. You will find there a detailed instructions on how to set up such spectrum analyzer. An yes – this is done under Linux. Continue reading