This document outlines a final year project to develop a remotely controlled car using an accelerometer and LED array for control inputs. The car will be controlled wirelessly using a dual-axis accelerometer tilt sensor and custom LED array detected by a microcontroller on both the transmitter and receiver ends connected by a ZigBee wireless module. The project aims to develop new control mechanisms using these sensors and wireless transmission to remotely operate the car for applications in robotics, military, search and rescue, and recreation.

1. FINAL YEAR PROJECT
SEMINAR ON:

2.  Project Guide : Prof. Ankita Patel
 Project Co-guide : Prof. Kavita Joshi
 Group Code : ETC15
 Group Members : ANIKET BHOR
ABHIJEET KALBHOR
ABHIJEET KAPSE

3. OBJECTIVE
 New Control Mechanisms.
 Two Controls for a Car.
 DUAL-AXIS ACCELEROMETER and LEDs (Light
Emitting Diodes) configured as photo-detectors.

4. INTRODUCTION
 Two-axis Accelerometer used as a tilt sensor
 Detects how far the chip was angled from its
neutral, (Horizontal) Flat position.
 A digital o/p for both the x & y-axes
 Which corresponds to how far the accelerometer was tilted & in
what direction.

5.  A custom LED array was also used to control the car.
 LEDs - Traditionally used as light producing elements,
 They also produce a voltage corresponding to how much
light they receive – brighter environments produce a
greater voltage across the LED.
 An Infrared Distance Sensor – For Obstacle Avoidance

6. Accelerometer
LED
Array
Microcontroller
on Tx Side
Wireless
Transmitter
Module
Wireless
Receiver
Module
Microcontroller
on Rx Side
Motor Drive
Mechanism
IR Sensor
(For Obstacle
Avoidance)

7. FREESCALE MMA 7361L DUAL-AXIS
ACCELEROMETER
 An Accelerometer measures the acceleration
 Used to sense orientation, vibration and shock.
 Present in portable electronic devices and video game
controllers. The accelerometer (MMA7361 L) by Freescale
Semiconductor.

8. SIMPLIFIED MODEL OF TILT
SENSOR

9. 4 BUTTON SENSOR ARRAY
 4 LED SENSORS – Forward, Reverse, Left, Right.
 To accomplish this, each LED was connected to an LM711 op-
amp in a non-inverting configuration.

11. TRANSMITTER UNIT
Figure : Transmitter Schematic (For Example)

12. RECEIVER UNIT
Figure : Receiver Schematic (For Example)

13. HARDWARE REQUIREMENT
Components
ATMega32 µC / 8051 µC
MC13202 (2.4 GHz Low Power Transceiver
for the IEEE® 802.15.4 Standard) X 2
[ZIGBEE Supported]
Suitable Antenna (iBall 2.4 Ghz Wireless
Antenna) X2
MMA7361L: 3-Axis Analog Output
Acceleration Sensor
IR sensor (From T.E. Project)
LEDs for SENSOR ARRAY
Other

14. SOFTWARE REQUIREMENT
Software Purpose
Diptrace PCB Design Layout
Keil µC Programming
Flashmagic IC Burning
Other ZigBee Compiler & Burner
LANGUAGES REQUIRED:
1. EMBEDDED C / ASSEMBLY LANGUAGE
2 . ZIGBEE / SMAC PROGRAMMING IDE

15. SCOPE OF PROJECT
(APPLICATIONS)
 Scientific
 Military and Law Enforcement
 Search and Rescue
 Recreation and Hobby

16. SUMMARY
 Importance in the Robotics & Commercial
Industries.

17. REFERENCES
 Wikipedia
 Using Light Emitting Diode Arrays as
 Touch-Sensitive Input and Output Devices –
Scott E. Hudson Human-Computer Interaction
Institute
Carnegie Mellon University, Pittsburgh
 http://www.cornell.edu - Cornell University
 http://www.zigbee.org - ZigBee Alliance Homepage