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ADC - Analog to Digital Conversion on AVR microcontroller Atmega16
The document discusses the differences between analog and digital signals, emphasizing that all continuous signals are analog, but not all analog signals are continuous. It explains the functionality of an ADC in converting analog inputs to digital values and describes the configuration of various registers involved in the conversion process. Additionally, the document provides code snippets demonstrating how to read ADC values in a digital format.
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ADC - Analog to Digital Conversion on AVR microcontroller Atmega16
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- 6. • Are allCONTINUOUS time signals ANALOG ? • All continuous time signals are analog but all analog signals are not continuous time ROBO INDIA
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- 8. • The ADCconverts an analog input voltage to a 10-bit digital value through successive approximation. • The minimum value represents GND and the maximum value represents the voltage on the AREF pin minus 1 LSB ROBO INDIA
- 9. 𝐴𝐷𝐶 = 𝑉𝑖𝑛 .1024 𝑉 𝑟𝑒𝑓 ROBO INDIA
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- 11. • What's wrongwith totally analog ? • Ans – Two arrows in a Quiver is always better than one ROBO INDIA
- 12. A digital signalis superior to an analog signal because it is more robust to noise and can easily be recovered, corrected and amplified. For this reason, the tendency today is to change an analog signal to digital data ROBO INDIA
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- 15. ReadADCX() { ADMUX=0x4X; ADCSRA=0x86; SETBIT(ADCSRA,BIT(6)); while(!(ADCSRA & (1<<ADIF))); s=ADC; return(s); } NOTE:X can take value from 0 to 7 ROBO INDIA
- 16. • ADMUX =0x4X • Let x = 1 ⇒ ADMUX = 0x41 ⇒ ADMUX = 01000001 0 1 0 0 0 0 0 1 ROBO INDIA
- 17. • REFS1 =0 • REFS0 = 1 0 1 0 0 0 0 0 1 ROBO INDIA
- 18. The ADLAR bitaffects the presentation of the ADC conversion result in the ADC Data Register. • ADLAR = 0 ⇒ LEFT ADJUST • ADLAR = 1 ⇒ RIGHT ADJUST 0 1 0 0 0 0 0 1 ROBO INDIA
- 19. • MUX4..0 =00001 0 1 0 0 0 0 0 1 ROBO INDIA
- 20. ReadADCX() { ADMUX=0x4X; // DONE ADCSRA=0x86; SETBIT(ADCSRA,BIT(6)); while(!(ADCSRA& (1<<ADIF))); s=ADC; return(s); } NOTE: X can take value from 0 to 7 ROBO INDIA
- 21. • ADCSRA =0x86 • Let x = 1 ⇒ ADCSRA = 0x41 ⇒ ADCSRA = 10000110 1 0 0 0 0 1 1 0 ROBO INDIA
- 22. • BIT 7 •ADEN ⇒ ADC Enable bit • ADEN = 1 ⇒ Enable ADC • ADEN = 0 ⇒ Disable ADC 1 0 0 0 0 1 1 0 ROBO INDIA
- 23. • BIT 6 •ADSC - Write this bit to one to start each conversion 1 0 0 0 0 1 1 0 ROBO INDIA
- 24. • BIT 4 •ADIF - This bit is set when an ADC conversion completes 1 0 0 0 0 1 1 0 ROBO INDIA
- 25. ADPS2..0 = 110⇒ Division factor is 64 1 0 0 0 0 1 1 0 ROBO INDIA
- 26. ReadADCX() { ADMUX=0x4X; // DONE ADCSRA=0x86;// DONE SETBIT(ADCSRA,BIT(6)); // DONE while(!(ADCSRA & (1<<ADIF))); s=ADC; return(s); } NOTE: X can take value from 0 to 7 ROBO INDIA
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