10-06-2017, 07:03 AM
Based on the accelerometer to control the wheelchair
In this project we use two paths. One of them is the transmitter and receiver the second scheme. The transmitter in the schema we use 3 axis accelerometer reference circuit and on the receiving end, we use a small wheelchair with RF receiver circuit. In the diagram the transmitter, we measure the value of 3 axis accelerometer and converted to a digital form using ADC 0809. The ADC converts the data from the sensor and microcontroller for further conversion. Microcontroller. The microcontroller receives data on the hexagon with the accelerometer and converted to ASCII code for the LCD display. LCD display X-Y-Z and display the values on the display. At the same time, the microcontroller receives the data and compare the inside with the predefined variables. As we change the position of the parties, the value changes automatically, and modify values are also shown on the LCD display. We use the testimony of the accelerometer for movement of wheelchairs. We use one circuit of the sensor and the transmitter circuit diagram one microcontroller for wireless transmission. We indicate the four variables for movement of wheelchairs. How to change the position of a controller also changes automatically. We get four conclusions from the controller. PIN No 5, 6, 7, 8 is not the output contact for the encoder. We use the HT12 E coder for serial communication. Data from a microcontroller connected to the contacts of the sensor and transmits via contact no. 17 of the coder. Output from the finger not 17 is connected to the transmitter Rf module HF transmitter module. receives the signal from the sensor and transmit the RF Frequency 433 using Mhtz. we use 2 to 16 LCD with a 0.
The components:
A step-down transformer
Step a step-down transformer with 220 volts AC to 9-0-9 AC. We use a step-down transformer to step down the voltage from 220 to 9 volts AC. It is also connected to AC rectifier circuits for AC conversion. Current transformer rating 750 Ma.
As this time, then the calculated?
The speed with which the microcontroller executes a statement is determined by what is known as a speed crystals. Crystal component connected externally microcontroller. Crystal has different meanings, and some of the values are 6 MHz, 10 Mhz, and 11.059 Mhz, etc.
Thus, 10 MHz crystal will throb of 10000000 times per second.
Reference: http://seminarsprojects.net/Thread-accel...z3JgZrh8ux