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A new way to determine distances in space

19.09.2015

Scientists from the University of Cambridge (UK) have come up with a new way to determine the distances to stars based on identical spectral characteristics.

Astronomers have taken as a basis a fairly simple principle: if two stars have exactly the same structure and chemical composition, then the intensity of their glow should also be identical. Accordingly, the difference in the distance to the stars should affect their brightness.

During the study, high-resolution spectra of 600 stars were analyzed, as a result of which 175 pairs of "twins" were found, and in each pair the distance to one of the celestial bodies was known with high accuracy.

To compare the spectra, the British chose 400 main spectral bands out of the available 280 and found that the proposed method gives an error of no more than eight percent compared to measurements based on the annual stellar parallax.

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MSP430FR6047 - microcontroller for ultrasonic meters 09.02.2018

The MSP430FR6047 is a new representative of microcontrollers from Texas Instruments, designed primarily for use in water, heat and gas meters.

The indisputable advantage of the MSP430FR6047 is that it uses innovative FRAM memory instead of traditional FLASH, as a result, reliability is increased (the number of rewrite cycles is up to 1015), power consumption is reduced during write operations, and it becomes possible to expand the amount of RAM due to FRAM.

The built-in USS (Ultrasonic Sensing Solution) module provides high measurement accuracy over a wide range of liquid flow rates (it is possible to measure very low flow rates: up to 1 l/h), helps to achieve ultra-low energy consumption during measurement and contributes to cheaper devices due to the requirement for small number of external components.

The MSP430FR6047 incorporates a high-speed (8 MSPS) sigma-delta ADC module, which, together with LEA (Low-Energy Accelerator), allows you to create current-optimized, high-precision measurement solutions with long battery life. In addition, the microcontroller includes a segment display driver, RTC, 12-bit SAR ADC, analog comparator, encryption and checksum modules. There is a built-in BSL bootloader that allows you to program and update software via UART and I2C interfaces even without using a JTAG programmer.

Main parameters of MSP430FR6047:

Clock frequency 16 MHz;
Program memory (FRAM) up to 256 kB;
RAM (SRAM) 8 kB;
Interfaces: 2xI2C, 6xSPI, 4xUART;
Built-in segment display controller;
32-bit hardware multiplier;
6-channel DMA controller;
Real time clock;
Sigma-delta ADC 12-bit 8 MSPS (16 channels), programmable gain;
SAR ADC 12-bit (16 channels);
Analog comparator (16 channels);
Timer 16-bit (x6);
Flexible timing setting;
Supply voltage 1,8...3,6 V;
Operating temperature range -40...85°С.

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