DAC-Piano

Created DAC Using R-2R Ladder Circuit To Implement Piano in TM4C. This project was done as the part of Embedded Systems course.

Components Used

• TM4C123GH6PM

• Buttons - 8

• 10kΩ resistors - 8

• 1kΩ resistors - 24

• 500Ω resistor - 1

• Potentiometer - 1

• Speaker - 1

Pin Configurations:

TM4C Pin	Circuit Connection
PE0	Button 1
PE1	Button 2
PE2	Button 3
PE3	Button 4
PF0	Button 5
PF1	Button 6
PF2	Button 7
PF3	Button 8
PB0	R-2R Bit 1
PB1	R-2R Bit 2
PB2	R-2R Bit 3
PB3	R-2R Bit 4
PB4	R-2R Bit 5
PB5	R-2R Bit 6
PB6	R-2R Bit 7
PB7	R-2R Bit 8

Circuit

Logic

• Constructed R-2R Ladder Design for 8-bits in Tivac Board using resistors, wire connectors, and connected Multimeter and in the R-2R Ladder.

• The 8-bit binary value is assigned to 8 ports of Port B

• GPIO Ports (E and F) are initialized as digital pins and set to input mode.

• Unlock PORT E and F and disable the analog function. We also clear the PCTL register for Ports E and F.

• Configured the Tiva C board pin connections for resistors in the R-2R ladder (port B pins).

• Each button corresponds with a different keynote and has a frequency index for each button.

• By reading the corresponding PORTS (Port E and F) , the button pressed is found.

• Pushbutton signals are sent to Tiva C pin connections ( VCC, GND, taking output signal from push buttons when pressed and feeding the input to Tiva C - 4 port E and 4 port F GPIO pins).

• Binary input values (corresponding frequencies of piano notes) are sent from Tiva C to corresponding R-2R Ladder resistors in the circuit.

• GPIO PE0-PE3 and PF0-PF3 ports are set from Tiva C to R-2R ladder DAC to Piezo to play the specific frequency.

• GPIO Port B in range of PB0-PB7 Pin is read from R-2R Ladder to corresponding Tiva C Button Connected GPIO Port ranging from PE0-PE3 and PF0-PF3 Port.

• Sine Waves are generated by setting frequency for 8 Basic notes in music to get through DAC R-2R Ladder.

Demo Link

https://drive.google.com/file/d/1T4WI3HeAmsE5nf2GBpMLfPKmT8kRCRYN/view?usp=sharing