Arduino Motor Drive Introx

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Transcript Arduino Motor Drive Introx

Arduino DC motor driver
L298 H-Bridge
Arduino GUI vs Atmel Studio
Stefan Pirvu
ADCES 2015
Content
• Arduino board review
• Serial communication, writing C# app in order
to communicate over serial - code
• Using H-Bridge to power DC motors
• PWM vs. continuous voltage drive
• Arduino GUI - code
• Atmel Studio - code
Arduino board review
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USB support
16MHz
32k memory
14 I/O pins
5 PWM pins
6 ADC pins
Using H-Bridge to power DC motors
L298
• http://www.tech.dmu.ac.uk/~mgongora/Reso
urces/L298N.pdf
• Cheap aprox. 10-20 RON
• Dual H-Bridge
PWM vs. continuous voltage drive
Analog
• bad at low voltages
• needs mechanical switches
• ranges depend on the
number of resistors
• very resistant over time
Digital
• good at low voltages
• fine control
• buzz sounds
Arduino GUI
• http://arduino.cc/
• Serial communication, writing C# app in order
to communicate over serial
• CODE 
Atmel Studio
• http://www.atmel.com/microsite/atmel_studi
o6/
• But before coding…
• http://www.atmel.com/images/Atmel-8271-8-bit-AVRMicrocontroller-ATmega48A-48PA-88A-88PA-168A168PA-328-328P_datasheet_Complete.pdf
• http://arduino.cc/en/Tutorial/SecretsOfArduinoPWM
ATMEGA328P
AIN0/OC0A/PCINT22 – Port D, Bit 6
OC0A, Output Compare Match output: The PD6 pin can serve as an external output for the
Timer/Counter0. Compare Match A. The PD6 pin has to be configured as an output (DDD6
set (one)) to serve this function. The OC0A pin is also the output pin for the PWM mode
timer function.
T1/OC0B/PCINT21 – Port D, Bit 5
OC0B, Output Compare Match output: The PD5 pin can serve as an external output for the
Timer/Counter0. Compare Match B. The PD5 pin has to be configured as an output (DDD5
set (one)) to serve this function. The OC0B pin is also the output pin for the PWM mode
timer function.
ATMEGA328 Timer/Counter
Timer Registers Several registers are used to control each timer. The Timer/Counter
Control Registers TCCRnA and TCCRnB hold the main control bits for the timer. (Note that
TCCRnA and TCCRnB do not correspond to the outputs A and B.) These registers hold
several groups of bits:
Waveform Generation Mode bits (WGM): these control the overall mode of the timer.
(These bits are split between TCCRnA and TCCRnB.)
Clock Select bits (CS): these control the clock prescaler
Compare Match Output A Mode bits (COMnA): these enable/disable/invert output A
Compare Match Output B Mode bits (COMnB): these enable/disable/invert output B
• LET’S CODE 
Use AVRDude to upload HEX
• >C:\Program
Files\Arduino\hardware\tools\avr\bin
• avrdude.exe -C”C:Program
Files\Arduino\hardware\tools\avr\etc\avrdud
e.conf” f -patmega328p -carduino -P\.COM4 b115200 -D Uflash:w:”$(ProjectDir)Debug$(TargetName).h
ex”:i
Thank you
• QUESTIONS??