Nowadays, electronic noses (E-nose) are becoming popular in the industry. There are a few types of E-noses which are used to detect odorant and gases such as surface acoustic wave (SAW) device, optical sensor, metal oxide semiconductors (MeOX), and carbon black polymer composite. An electronic nose is a device that can be mimicking a biological human nose, which can detect and differentiate types of odorant. This work focuses on how to fabricate a carbon black polymer composite gas sensor. In addition, a constant current source circuit has been designed to act as an interface circuitry so that the change of resistance when exposed to the gas can be observed via LabVIEW. Besides that, the characteristics of each sensor are observed and studied. This is to ensure that the fabricated sensor responds similarly to the actual sensor. The result from the experiments shows that the fabricated carbon black polymer composite gas is able to detect and give respond just like the actual gas sensor.