hgfedcba
Newbie level 3
hi all,
I am trying to build a gas sensor array [CO, CO2, NH3]... i do not want to connect them all seperately to the microcontroller [using PIC16f866] as i need many port pins for further application circuits... can u plz help me in designing a data acq circuit for the sensor array... am planning to use MQ series gas sensors...
sensor1----> sample and hold1---> MUX
sensor2----> sample and hold2 ----> MUX
sensor3----> sample and hold3----->MUX
from MUX----> ADC of PIC micrcontroller...
can u guide me?
i suppose that i need an external sample and hold ciruit, right?
I am trying to build a gas sensor array [CO, CO2, NH3]... i do not want to connect them all seperately to the microcontroller [using PIC16f866] as i need many port pins for further application circuits... can u plz help me in designing a data acq circuit for the sensor array... am planning to use MQ series gas sensors...
sensor1----> sample and hold1---> MUX
sensor2----> sample and hold2 ----> MUX
sensor3----> sample and hold3----->MUX
from MUX----> ADC of PIC micrcontroller...
can u guide me?
i suppose that i need an external sample and hold ciruit, right?