基于OPA129U和ADS8364的四通道土壤养分检测仪设计

s a simple, quick, and non-destructive analysis tool, which can be used for non-ferrous and cloudy solution, ion selective electrode has been applied in agriculture. However, further research of soil nutrient rapid detection based on ion selective electrode is still worked on. In this paper, soil nutrient detector is emphatically studied for ion selective electrode signal acquisition, which includes signal conditioning module, analog-to-digital conversion module, temperature detecting module, single chip microcomputer controller, serial communication module, power module, LCD module and so on. To achieve the purpose of reducing system power consumption, a 16-bit ultra-low power MSP430F149 microcontroller is chosen. The measurement accuracy can reach 0.1 mV. Performance comparison tests are taken among this instrument and imported ion meter, and the comparison results are ideal. The correlation coefficient is 1.