28th FEB - The Sixth Lab - Test different movement form

This lab time, we combined the 'Arduino' board to control the signal. As I mentioned in the last blog , the signal is not stable when sensor detects movement. 'Arduino' board can completely solve this problem. This is code.

Figure 1

'a' and 'b' control the upper circuit and lower circuit delay time respectively. Meanwhile, 'm' and 'n' control the voltage of upper circuit and lower circuit respectively. When delay time is greater than 30, the generated low voltage is in the steady state which means no movement pass that sensor. Conversely, if delay time is less than 30, this low voltage is in the unstable high voltage range which means it can be ignored. Figure 2 shows the relevant range. 

Figure 2

After that, fall detection can be detected.