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Ditulis Oleh : YK69 Elektro
Judul : Rangkaian pengukur jarak Digital

Rangkaian pengukur jarak Digital

Pengukur jarak Digital

This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants' pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1 (the least significant digit) shows hundreds meters and its dot illuminates after every 50 meters of walking. A beeper (excludable), signals each count unit, occurring every two steps.

Skema Rangkaian pengukur jarak Digital

Note:

Experiment with placement and sloping degree of mercury switch inside the box: this is very critical.
Try to obtain a pulse every two walking steps. Listening to the beeper is extremely useful during setup.
Trim R6 value to change beeper sound power.
Push P1 and P2 to reset.
This circuit is primarily intended for walking purposes. For jogging, further great care must be used with mercury switch placement to avoid undesired counts.
When the display is disabled current consumption is negligible, therefore SW3 can be omitted.

A normal step was calculated to span around 78 centimeters, thus the LED signaling 50 meters illuminates after 64 steps (or 32 operations of the mercury switch), the display indicates 100 meters after 128 steps and so on. For low battery consumption the display illuminates only on request, pushing on P2. Accidental reset of the counters is avoided because to reset the circuit both pushbuttons must be operated together. Obviously, this is not a precision meter, but its approximation degree was found good for this kind of device. In any case, the most critical thing to do is the correct placement of the mercury switch inside of the box and the setting of its sloping degree.


List Component

R1,R3____22K   1/4W Resistor
R2________2M2  1/4W Resistor
R4________1M   1/4W Resistor
R5,R7,R8__4K7  1/4W Resistor
R6_______47R   1/4W Resistor
R9________1K   1/4W Resistor
C1_______47nF   63V Polyester Capacitor
C2______100nF   63V Polyester Capacitor
C3_______10nF   63V Polyester Capacitor
C4_______10µF   25V Electrolytic Capacitor
D1_______Common-cathode 7-segment LED mini-display (Hundreds meters)
D2_______Common-cathode 7-segment LED mini-display (Kilometers)
IC1______4093   Quad 2 input Schmitt NAND Gate IC
IC2______4024   7 stage ripple counter IC
IC3,IC4__4026   Decade counter with decoded 7-segment display outputs IC
Q1,Q2___BC327   45V 800mA PNP Transistors
P1_______SPST Pushbutton (Reset)
P2_______SPST Pushbutton (Display)
SW1______SPST Mercury Switch, called also Tilt Switch
SW2______SPST Slider Switch (Sound on-off)
SW3______SPST Slider Switch (Power on-off)
BZ_______Piezo sounder
B1_______3V Battery

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