Circuit Schematic Acceleration Meter for Car using ADXL202 IC

Autometronicschool. - This is one of automotive electronic circuit for you that will to be your reference for your electronic knowledge this time in automotive field. This circuit is Acceleration Meter for Car based on ADXL202 IC.

In this time we will give you circuit diagram of this Acceleration Meter for Car using ADXL202 IC like in Figure 1 and Figure 2, and then we will give you global description about this circuit and the last we will give you link to read more this circuit from original source.

Circuit Schematic

Figure 1. Circuit Schematic Acceleration Meter for Car using ADXL202 IC (Source: www.serasidis.gr)

Figure 2. the connections for ADXL202 (Source:www.serasidis.gr)

Description

Circuit schematic like in Figure 1 above is Circuit Schematic Acceleration Meter for Car using ADXL202 IC. According Serasidis site describe The measurement of acceleration becomes with the use of IC from Analog Devices, the ADXL202. The particular element contains 2 autonomous vertical between them sensors, for the measurement in two axes. For the particular application becomes use of only it's one. Acceleration meter measures dynamic or static acceleration from  –2g until 2g (where g is the acceleration of gravity) and when this is equal to zero, exit is a signal PWM, with Duty Cycle 50%. As long as the acceleration increases, increases also the Duty Cycle, with biggest response the 75% (in the 2g), while for acceleration  –2g, the Duty Cycle is 25%. As conclusion from more, has that for change 1g, is altered also the Duty Cycle of exit at 12,5%. 

 The measurement of Duty Cycle of response of acceleration meter becomes with the help of Timer1 (16 bit). The period of signal of expense, has been fixed in the 1,12 msec. The frequency of oscillation of microcontroller is in the 3,6864 MHz and this means that it's each circle of access lasts 0,27 * 10 -6  sec. Using timer1, in frequency of measurement ck/1, the biggest feasible counted time is the 65536 * 0.27 * 10 -3  msec = 17.778 msec, which is bigger than period (1,12 msec). So, any price Duty Cycle it is possible to be measured. 

Before the beginning of measurements, it precedes a process of accelerator’s initializing. At this process it is doing 16 measurements, and then is found their mean. In short time interval, it is considered that the acceleration was not altered also thus the result, us gives the point of null acceleration. In other words at this process becomes approach of value Duty Cycle, that corresponds in null acceleration. From now on, after each measurement, it will be removed from Duty Cycle, the null acceleration.

 At the placement of appliance, the completed ADXL202 should be always parallel with the surface of ground and the pins 1 and 14 they see front part of car.  The LCD is connected at the K2 connector and the ADXL202 is connected at the K1 connector (K3 is connected with K1).

Read more

And now you can read more about Circuit Schematic Acceleration Meter for Car using ADXL202 IC from original source using link here.