[073] Activity Monitoring [074] Detection and monitoring of human actions is useful in many applications such as patient monitoring. A wearable human motion detection platform based on the smart textile (e.g. a garment incorporating a sensory textile as described above) for healthcare monitoring is developed as shown in FIGs. 10a to lOd. Relevantly, FIG. 10 shows photos of activity monitoring sensors on the hip as shown in FIG. 10(a), the arm as shown in FIG. 10(b), the elbow as shown in FIG. 10(c), and the knee as shown in FIG. 10(d). FIG. 10(e) shows the output signals of the four sensors shown in FIGs. 10(a) to 10(d) under various scenarios - e.g. standing up (1000), walking (slow 1002a, fast 1002b), running (1004), exercises (slow 1006a, fast 1006b), falling down (1008), and sitting down (1010). [075] The whole system contains four parts to differentiate different human motions. A simple three-layer structured TENG based on the smart textile described above is fabricated and attached onto an arched polyethylene terephthalate (PET) thin film as demonstrated in FIG. 10. A self-powered sensor is put onto the hip as shown in FIG. 10(a) to detect the sitting- down or standing-up motion and attached right beneath the knee as shown in FIG. 10(d) to sense a sudden fall-down. A multi-arch shaped strain sensor is placed onto the elbow as shown in FIG. 10(c) to record the movement of the human arm, and together with a textile based TENG attached on sleeve and underneath the arm separately as shown in FIG. 10(b), the human activities can be more precisely differentiated. A sensory textile device may, for example, include a sensory textile configured to be positioned at a first location on a human body, and a spacer layer and conductive backing configured to be positioned at a second location on the human body that moves past the first location as shown in FIG. 10(b) during a movement of the human body, thereby to activate the sensory textile device. This activation may be through triboelectric properties of the sensory device. [076] Through monitoring of the bending angle and the moving speed of the arm, useful information can be collected of the exercise performed by the human body. If the person goes through a sudden falling incident when walking or running, an enormous large positive peak voltage can be detected from the device as shown at 1008. This could be used for fall detection for the elderly or the disabled. A wireless transmitting module could be implemented to set up an alarm to inform a hospital if the person did not stand up after a short period from a detected fall. A negative output voltage can only be detected when the person stands up from the ground. [077] CO2 Sensing