Mikroelektronika d.o.o.
Carte à clic pour voltmètre
Carte à clic pour voltmètre
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Le Voltmeter Click Board™ est une carte complémentaire MikroBUS permettant de mesurer la tension dans un circuit électrique externe. La carte est conçue pour mesurer uniquement le courant continu et dispose d'une plage de mesure de 0 à 24 V (il est possible de mesurer à la fois la polarité positive et négative).
The design of the Voltmeter Click Board™ is based on an OpAmp set up as a differential amplifier with a buffered input.
Two onboard screw terminals (probe+ and probe-) are bringing in the current, which then flows through a row of four resistors. A voltage – proportional to the input charge – is generated across the last two resistors. From there it is sent to the differential amplifier that further intensifies the difference between the two inputs (+/-).
The resulting charge is exactly 33 times lower than the actual measured voltage. It is converted by an onboard 12-bit ADC before being outputted through the mikroBUS™ SPI interface (the firmware in the target board MCU should be set up to multiply the ADC value to get the actual voltage). It is also possible to output the analog value directly through the mikroBUS™ AN pin (useful if the target MCU has a higher resolution ADC).
The Voltmeter Click Board™ can work with either a 3.3V or a 5V power supply.
Carte à clic pour voltmètre
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