Transcript The EMG Signal

Background

Who does this project addresses to?
Handicapped.
 Amputated limbs.
 Paralyzed.


Motivation Statistics
Project’s Goals
The objective of this project is to drive a robotic
arm and vehicle wirelessly by moving certain
muscles in the body.
An important attribute of this system is a
correct sample of electrical signals from muscles
(EMG) and the translation of these signals into
an action.
Block Diagram
Camera
Monitor
FILTER AND AMPLIFIER
CIRCUIT
A/D Converter
MicroController
Electrodes In
Back
Laser 4 R/C
Robotic Arm
Camera
Demonstration
Link
Design Stages
Create interface between radio transmitter and
microcontroller.
 Control the robotic arm & vehicle by
microcontroller.
 Design and build Amplifying and Filtering
circuit.
 Sample the EMG signal and translate it to
movement commands.

The EMG Signal

An EMG signal is a small electrical current that
is released when a muscle is contracted.

The EMG signal can be read or measured by
placing conductive elements or electrodes on
skin surface.

The voltage level of the signal is 0.01-10mV at
freq range of 0-500Hz
Filter & Amplifier Circuit

Uses Instrumentation Amplifier
and Universal Active Filter.
 Amplifies
the low measured
signal to make it suitable for a sample.

Filters Background noise.
Micro Controller - Pic18


5v
A/D-Sample a analog signal that already been
filtered and amplified.
 The resolution- 10 bit, 4.88mV/bit.
Create interface to radio transmitter
 PWM signal.
Long Sync Pulse
Ch 1
Ch 2
Ch 3
Ch 4
Ch 5
0v
Sync
Pulse
Sync
Pulse
Sync
Pulse
Sync
Pulse
Sync
Pulse
Sync
Pulse
Micro Controller - Pic18
EMG
Signal
A/D
Avaraging
Decision
Creating
output
signal
Communication System

Laser 4 Remote control
Receives the signal from
microcontroller.
 Modulates and transmit 72MHz FM modulated
signal.


The Hitec HFD-08RO receiver
Located on the mobile vehicle
 Demodulates the FM Signal
 Parsers the received data to 8 channel

Robotic Arm &Vehicle
The robotic arm is based on
Hi-Tech servo motors.
 The angel of the motor is
determined by the width of the PWM it gets.
 The robotic arm controlled by 5 PWM channels
(have 5 motors).
 4X4 weal drive vehicle controlled by 2 PWM
channels.

Digital Camera & Monitor

The camera is tracking the movement of the
robot and sending a PAL video signal at
2.4GHz.

The monitor has an internal video receiver
with LCD screen and Video and Audio outputs.
Future research
Working a circuit board (will reduce noise ).
 Reducing size of communication system.
 Working in frequency domain with DSP
processor .
 Reduce energy consumption.
 Integrate EEG-electric signals from the brain.
