Resistance strain type force sensor made of digital electronic circuit diagram

Published:2014/4/13 21:23:00 Author:lynne | Keyword: Resistance strain type force sensor made of digital electronic circuit diagram | From:SeekIC

The working principle Digital electronic circuit principle as shown in figure, its main part is the resistance strain sensor R1 and IC2, consisting of the IC3 measurement amplifier circuit, and IC1 table and peripheral components of digital display panel. R1 sensor used on the ~ ZAA foil type resistance strain gauge, the normal value of 350 o. Measurement circuit will generate the resistance of the R1 variables should be converted into voltage signal output. The IC3 is the weak voltage signal is amplified and converted as A/D converter input analog voltage. IC4 provide l. 22 v voltage reference, it also the R5, R6 and RP2 after partial pressure for A/D converter reference voltage. 3-1/2 bits A/D converter ICL7126 reference voltage input end, introduced by contact among RP2, negative side is introduced by the middle of the RP3 contact. Reference voltage on both ends of nonlinear error of sensors suitable amount of compensation. Component selection1. IC1 choose ICL7126 integrated block; IC2, the IC3 choose high precision low temperature standard precision op-amp OP - 07; IC4 choose LM385-1.2 V integrated block. 2. RI sensor selection on - ZAA foil type resistance strain gauge, the normal value for 350 o,. 3. The resistance element appropriate chooses precision metal film resistors. 4. RPI choose precision potentiometer, more RP2, RP3 after debugging respectively replaced with precision metal film resistors. 5. Capacitor C1 use mica or ceramic dielectric capacitors.



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