LAMPlRANA

LISTING PROGRAM Program ControUer #include #define Lin P2_0 #define x- in P2 - 1 #define atas PO 0 #define bawah PO #define kiri PO 2 #define kanan PO 3 #define kirim PO 4 int temp,temp2,temp3,temp4; void main 0 { atas=O; bawah=O; kiri=O; kanan=O; while (I) { kirim=l; temp=O; while (L in== 1) { temp++; } temp2=O; while (y jn==O) { temp2++; } temp3=O; while (x_in=l) { temp3++; } temp4=O; while(x_in==O) { temp4++; }

if «temp=temp2-20)) { atas=l; bawah=l; kirim=O; kirim=l; } else if(temptemp2+20) { atas=l; bawah=O; kirim=O; kirim=l; } if «temp3 =temp4-20)) { kiri= 1; kanan=l; kirim=O; kirim=l; } else if (temp3temp4+20) { kiri=l; kanan=O; kirim=O; kirim=l ; }

} }

Program Device #inc1ude #define a P2 0 #define b P2 I #define c P2 2 #define d P2 3 #define maju PO_O #define mundur PO I #define kiri PO 2 #define kanan PO 3 #define datalcd P3 #define rs PI I #define e PI 2 #defineopto Pl_7 const char kata[] = "JARAK = "; int sa,temp,buf,buf2,bui3,dat,i,buf4,bufS,test,koma; long int count,count2,count3; void tunda(int loop2) { int loop; loop=O; while (loop

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TPC 11. X-Axis Sensitivity at X OUT, Voo ~ 5 V

TPC 8. X-Axis Sensitivity at X OUT, Voo ~ 3 V

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TPC 9. Y-Axis Sensitivity at YOUT, Voo = 3 V

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TPC 14. Typical Supply Current vs. Temperature

TPC 17. Cross-Axis Sensitivity Distribution

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TPC 15. Rotational Die Alignment

TPC 18. Typical Turn-On Time

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nominally 50% duty cycle. The acceleration signal can be determined by measuring the length of the Tl and T2 pulses with a counterltimer or with a polling loop using a low cost microcontroller.

DEFINITIONS T1 Length of the "on" portion of the cycle. T2 Length of the total cycle. Duty Cycle Ratio of the "on" time (TI) of the cycle to the total cycle (T2). Defined as Tlrr2 for the ADXL202EJ ADXL210. Pulsewidth Time period of the "on" pulse. Defined as TI for the ADXL202EJADXL210.

An analog output voltage can be obtained either by buffering the signal from the X F1LT and YFU.T pin, or by passing the duty cycle signal through an RC filter to reconstruct the de value.

The ADXL202E will operate with supply voltages as low as 3.0 V or as high as 5.25 V.

THEORY OF OPERATION The ADXL202E is a complete, dual-axis acceleration measuremem system on a single monolithic IC. It contains a polysilicon surtacemicromachined sensor and signal conditioning circuitry to implement an open loop acceleration measurement architecture. For each axis, an output circuit convens the analog signal to a duty cycle modulated (DCM) digital signal that can be decoded \vith a counter/timer pon on a microprocessor. The ADXL202E is capable of measuring both positive and negative accelerations to at least ±2 g. The accelerometer can measure static acceleration forces such as gravity, allowing it to be used as a tilt sensor.

The sensor is a surface micromacltined polysilicon srructure built on top of the silicon wafer. Polysilicon springs suspend the strucrure over the surface of the wafer and provide a resistance against acceleration forces. Deflection of the strucrure is measured using a differential capacitor that consists of independent fixed plates and central plates attached to the moving mass. The fixed plates are driven by 1800 out of phase square waves. An acceleration will deflect the beam and unbalance the differel'tiaJ capacitor, resulting in an output square wave whose amplitude is proportional to acceleration. Phase sensitive demodulation techniques are then used to rectifY the signal and determine the direction of the acceleration.

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T2

I

~ = (TIIT2 -

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0g~5O%

Figure 1. Typical Output Duty Cycle

APPLICATIONS POWERSUPPLYDECOUPUNG For most applications a single 0.1 )IF capacitor, CDC, will adequately decouple the accelerometer from signal and noise on the power supply. However, in some cases, especially where digital de,ices such as microcontrollers share the same power supply, digital noise on the supply may cause interference on the ADXL202E output. This may be observed as a slowly undulating fluctuation of voltage at ~LT and YFILT. If additional decoupling is needed, a 100 U (or smaller) resistor or ferrite beads, may be inserted in the supply line of the ADXL202B. FERRITE BEAD

The output of the demodulator drives a duty cycle modulator (DCM) stage through a 32 !ill resistor. At this point It pin is available on each channel to ~----------4>~ 10

AT89S51 2487B-MICRO-12103

AT89S51 Oscillator Characteristics

XTAL 1 and XTAL2 are the input and output, respectively, of an inverting amplifier that can be configured for use as an on-chip oscillator, as shown in Figure 2. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL 1 is driven, as shown in Figure 3. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed. Figure 2. Oscillator Connections C:{

.--1'1-,~......- ;

XTAl2

1 n

c; -----4i ~--