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#What is an analog to digital converter how to
In our next tutorial, we will see how to use the I2C in PIC16F877A. While(GO_nDONE) //wait until conversion is finishedĪdcval=((ADRESH<<8)|(ADRESL)) //store the result TRISB=TRISC=0 //Port B and Port C is Output (LCD) _CONFIG( FOSC_HS & WDTE_OFF & PWRTE_OFF & CP_OFF & BOREN_ON & LVP_OFF & CPD_OFF & WRT_OFF & DEBUG_OFF)
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In this pin, you can connect any sensors. Whenever value changes in Potentiometer it will display in LCD Module. For the next conversion, go to step 1 or step 2 as required. Read A/D Result register pair (ADRESH: ADRESL), clear bit ADIF if required.ħ. Polling for the GO/DONE bit to be cleared (interrupts disabled) ORĦ.Wait for A/D conversion to complete by either: Configure analog pins/voltage reference and digital I/O (ADCON1)ĥ.To do an A/D Conversion, follow these steps: The block diagram of the A/D module is shown below. When the A/D conversion is complete, the result is loaded into this A/D Result register pair, the GO/DONE bit (ADCON0) is cleared and the A/D interrupt flag bit ADIF is set. The ADRESH: ADRESL registers contain the 10-bit result of the A/D conversion. PCFG3-PCFG0: A/D Port Configuration Control bitsĪ/D Result High Register (ADRESH) & A/D Result Low Register (ADRESL) Six (6) Least Significant bits of ADRESL are read as ‘0’. Six (6) Most Significant bits of ADRESH are read as ‘0’.Ġ = Left justified. The port pins can be configured as analog inputs (RA3 can also be the voltage reference) or as digital I/O.ġ = Right justified. The ADCON1 register, shown below, configures the functions of the port pins i.e Used to configure the GPIO pins for ADC. These bits are based on ADCON1 Reister’s ADCS2 bit.ġ = A/D conversion in progress (setting this bit starts the A/D conversion which is automatically cleared by hardware when the A/D conversion is complete)Ġ = A/D converter module is shut-off and consumes no operating current A/D Control Register 1 (ADCON1) Used to Turn ON the ADC, Select the Sampling Freq, and also Start the conversion.ĪDCS1-ADCS0: A/D Conversion Clock Select bits. The ADCON0 register, shown in the below image, controls the operation of the A/D module i.e. A/D Result Low Register (ADRESL) A/D Control Register 0 (ADCON0).PIC16F877A ADC PinsĪDC Channel Pin Channel 0 RA0/AN0 (Port A) Channel 1 RA1/AN1 (Port A) Channel 2 RA2/AN2/VRef- (Port A) Channel 3 RA3/AN3/VRef+ (Port A) Channel 4 RA5/AN4 (Port A) Channel 5 RE0/AN5 (Port E) Channel 6 RE1/AN6 (Port E) Channel 7 RE2/AN7 (Port E) Registers used for ADC
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To operate in Sleep, the A/D clock must be derived from the A/D’s internal RC oscillator. The A/D converter has the unique feature of being able to operate while the device is in Sleep mode.
#What is an analog to digital converter software
The A/D module has high and low-voltage reference input that is software selectable to some combination of VDD, VSS, RA2, or RA3. The conversion of an analog input signal results in a corresponding 10-bit digital number. The Analog-to-Digital (A/D) Converter module has eight for the 40/44-pin devices. Using this ADC we can connect any type of Analog sensor. but the ADC Analog-to-Digital converter remains famous among all. As we all know many interface methods have been developed over years to solve the complex problems of balancing needs of features, cost, size, power consumption, reliability, etc. Microcontrollers are very useful especially when it comes to communicating with other devices, such as sensors, motors, switches, memory, and even another microcontroller. LCD Interfacing with PIC16F877A Introduction.Output – PIC16F877A ADC Tutorial PIC16F877A ADC Tutorial Prerequisites