555 electronic cane circuit

Published:2011/6/1 18:59:00 Author:TaoXi | Keyword: 555, electronic cane | From:SeekIC

As the figure 15-38 shows, the electronic cane circuit is composed of a 555 circuit, a audio integrated circuit KD-9561 and the mercury switch.etc. It has two functions: alarm and lighting, it is small and exquisite. When people with this electronic cane fall down, the mercury switch K1 opens, the power supply adds to the two integrated blocks. The trigger circuit is composed of the 555 and R1, R2, C1. Once the K1 opens, because the C1's voltage can not be changed, so the 555 sets, it's pin-7 has the high resistance to conduct VT1, so the alarm sound of the KD-9561 is sent out by the YD electromagnetic signal response device to call people for help.



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