See also Revised version of LM35 based digital temperature meter The CHS3, CHS2, CHS1 and CHS0 bits are used to select the ADC input channel, by setting all these bits to the logical “ ” means we choose the channel 0 or AN0 (PIN 19) port which connected to the user’s trimport on the PICJazz 16F690 board. The function of this register is to control the microcontroller ADC operation such as power on the ADC circuit, start converting, channel selection, ADC voltage reference selection and ADC result format presentation selection. The user’s switch is works as a toggle switch, by pressing this switch once the running LEDs will be switched to the blinking LEDs pressing once again will switch back to the running LEDs.įor the ADC peripheral programming on the Microchip PIC16F690 microcontroller we will focus on these 2 important registers, is that all… yes you are right again only 2 registers (if you curious of how this ADC setup being done in AVR microcontroller family, you can take a look at the similar project Analog to Digital Converter AVR C Programming posted in this blog): The user’s trimport basically work as the voltage divider circuit and provide voltage input level to the microcontroller analog port ( AN0) therefore by changing the trimmer means we change the voltage level input and this also will change the running LEDs speed. This voltage value will be converted by the PIC ADC peripheral and passing the converted numeric value as the delay argument on the _delay_ms() function inside the loop. This program basically works by displaying the running LED attached to RC0, RC1, RC2 and RC3 ports on the PIC16F690 microcontroller the speed of the running LED is controlled by the voltage value reads from the user’s trimport on the port RA0. See also Building BRAM your first Autonomous Mobile Robot using Microchip PIC Microcontroller – Part 1 GODONE=1 // initiate conversion on the channel 0 while(GODONE) continue // Wait conversion done iDelay=ADRESL // Get the 8 bit LSB result ADC port channel 0ĪDCON1=0b00110000 // Select the FRC for 8 MhzĪDON=1 // turn on the A2D conversion module chEye=0x01 // Initial Eye Variables with 0000 0001 Unsigned int iDelay OSCCON=0x70 // Select 8 Mhz internal clock TRISC = 0x00 // Set All on PORTC as OutputĪNSEL = 0b00000001 // Set PORT AN0 to analog input AN1 to AN7 digital I/OĪNSELH = 0 // Set PORT AN8 to AN11 as Digital I/O /* Init ADC */ĪDCON0=0b10000000 // select right justify result. #define _delay_us(x) void _delay_ms(unsigned int ms) & BORDIS & IESODIS & FCMDIS) // Using Internal Clock of 8 Mhz _CONFIG(INTIO & WDTDIS & PWRTEN & MCLREN & UNPROTECT & UNPROTECT \ ** FCMDIS - Monitor Clock Fail Safe Disable ** IESODIS - Internal External Switch Over Mode Disable ** UNPROTECT - Data EEPROM Read Un-Protect Compiler : HITECT PICC-Lite Version 9.60PL1 Description : Analog to Digital Converter
ANALOG TO DIGITAL CONVERTER MICROCONTROLLER HOW TO
On this tutorial we will learn how to program the Microchip PIC microcontroller for reading the analog signal using HITECT PICC-Lite C compiler. Therefore before we can use all of these cool sensors we have to learn the basic of how to use ADC peripheral inside the PIC 16F690 microcontroller. Today many manufactures produce sophisticated sensors for specific task such as sharp GP2D120X is use for distance measurement, National Semiconductor LM35 for precision centigrade temperature sensor, HS12 humidity sensor from GE, TGS2442 carbon monoxide gas sensor from Figaro and many more. Some of the basic sensor such as LDR (Light Dependent Resistor) is used for measuring the light intensity or NTC (Negative Temperature Coefficient) a special resistor for measuring the temperature. Usually we use the electronic sensor to convert the analog value to the voltage level value. The ADC is one of the important features that enable us to digitize our analog world. The PIC16F690 microcontroller is one of Microchip midrange 8-bit microcontroller that has a build in 10-bit resolution of Analog to Digital Converter (ADC) peripheral.
ANALOG TO DIGITAL CONVERTER MICROCONTROLLER PDF
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