I am currently in a project to design a wearable device where to identify the presence of pee and poop in diapers. Apart from humidity sensor and temperature sensor, as for now a feasible way to identify them are through gas sensors. As for the features, I am planning to add, gyro sensor, IR sensor and a GPS module. Are there any simulation software that able me to do so. Do you guys have any other advise? Because i should be able to make it smaller. Tq

 

PSpice models exist for gas/odur sensors. So you should be able to design a circuit and simulate with PSpice or LTspice.