Easy sports pedometer ----- Step Counter

Easy sports pedometer, Step Counter Keywords: pedometer circuit diagram, CD4553, CD4093 Be Author: 贵 荣 荣 This article describes the exercise pedometer that helps walk or run at any time. Its main functions are: (1) Perceive a walk or running state by vibration sensor; (2) Set a certain time unit for step; (3) The circuit has display, alarm, and power saving function. The circuit principle is shown in the drawings. Its circuit is composed of vibration sensors CLA-2M, IC1-1, IC1-2, and time setting circuit composed of IC1-3, IC1-4; IC2, IC3, and peripheral components composed of count display circuits and VT1 The four sections of the alarm circuit composed of UM66. CLA-2M is a two-dimensional vibration sensor (9 mmx9 mmx6mm, sensitivity. 1882.0.1g, operating frequency 0.3Hz ~ 20Hz). It has extremely high sensitivity. Due to vibration, the low level pulse it outputs triggers the RS trigger composed of IC1-1, IC1-2, which outputs to the counting circuit. The previous IC1-2 output high level, IC1-3 outputs low, C4 is turned on, and the IC1-4 outputs high level. The CLA-2M is vibrated to trigger IC1-2 outputs a falling edge effective count pulse. Single stabilizers are triggered by low levels of IC1-3 output high. The VD reflection is closed, the RP, C4 delay circuit is enabled, and the RP can change the setting of the unit time. When the IC1-4 outputs low level at the end of the temporary time, the RS flip-flop flip initialization is allowed to trigger a new count trigger. It can be seen that the RS trigger is controlled by the unit time count setting circuit. IC2 uses a single-chip BCD counter (CD4553B), the automatic reset circuit C2, R3 causes IC2 power to initialize, C3 is the timing capacitance of the IC2 internal clock oscillator, (12) pin input negative edge trigger counting pulse, ⑨, 7, 6, 5 foot output BCD count signal, drive IC3 (CD4511 B) by seven segments (CD4511 B) drives 3-bit Cathode Digital Tube LC5011-11S, IC2 (15), 1, 2 foot The output bit drive signal is output, and VT2, VT3, and VT4 are turned on. The motion step value is displayed by the 3-bit digital tube. VT1, music triode UM66, speaker BL, etc. forms a speed alarm circuit. When the movement is too fast, the IC2 (14) foot output overflows positive pulse signal, VT1 is turned on. The UM66 driver speaker BL issued a music. B5 is a current limiting resistor. The UM66 is given the appropriate operating voltage (typical value 3V).

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