Mikroelektronika d.o.o.
Carte à clic R Meter
Carte à clic R Meter
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Overview
La carte R Meter Click Board™ est une carte complémentaire mikroBUS dotée d'un circuit permettant de mesurer la valeur des résistances. La carte peut être utilisée pour mesurer une large gamme de résistances (de 0 à 1 méga Ω). La conception est basée sur un circuit amplificateur non inverseur, la résistance mesurée étant placée dans une boucle de rétroaction qui influence le gain de l'amplificateur
The main component of the R Meter Click Board™ is the AD8616, single, dual and quad rail-to-rail input and output single supply amplifier. produced by Analog Devices. The analog output is fed through a 12-bit ADC with the final output going through the mikroBUS™ SPI interface.
Since the ADC has a limited min-max range (0-2043), the R Meter Click Board™ employs a multiplexer that can adjust the input signal to the amplifier and thus allow the same ADC to measure four different scopes of values (0-1k , 1k-100k, 100k-1M)
The supplied firmware (available on Libstock) automatically scans the ADC value and switches the multiplexer output based on the resistor in place. The multiplexer interfaces directly with the target board MCU through mikroBUS™ S1, S2, and S3 pins (in place of default mikroBUS™ PWM, INT and RST).
Onboard screw terminals are placed to allow the R Meter Click Board™ to be used with multimeter probes.
The board is designed to use a 5V power supply.
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