doesn’t has inbuilt ADC. So we have to use external ADC. There are many ADCs. Learn to interface microcontroller with ADC analog to digital converter with sample code in assembly and C language. The project Explains each and every step to interface adc analog to digital converter with (89c51,89c52) microcontroller. Simple example with Free.

Author: Yomi Voodoogrel
Country: Haiti
Language: English (Spanish)
Genre: Video
Published (Last): 6 June 2014
Pages: 202
PDF File Size: 3.86 Mb
ePub File Size: 4.4 Mb
ISBN: 639-2-78779-179-5
Downloads: 71144
Price: Free* [*Free Regsitration Required]
Uploader: Dogore

And then microcontroller changes ADC channel by using address line. If this is not connected the default reference voltage is 5V. ADC is connected as shown in the circuit diagram.

8051 – ADC0804 Interfacing

Skip to main content. Are you sure the code is uploaded correctly? There are two very important registers inside the LCD. If yes then try a basic blink program on your hardware and check if that is working properly. RW is made low for write operation.

Proteus simulation also gives the same result-glowing LCD but no display of characters. The higher resolution ADC gives smaller step size. Choosing Motor For Robots. And for demonstration we have used three variable resistors. ADC Analog to digital converters find huge application as an intermediate device to convert the signals from analog to digital form. It gives you complete information that you need regarding the communication of IC.


After a specified time delay, next cycle starts. AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family.

Thanks and more power. I tried this circuit, but it is not working as expected.

How to interface ADC0804 using 8051 microcontroller (AT89C51)

Log in or register to post Comment. Crystal X1 and capacitors C2,C3 are associated with the clock circuitry of the microcontroller. For selecting all the other input channels, have a look on the given table:. RS is made low for command write.

Hope this helps CODE: A 9 volt battery and a 5 volt voltage microcntroller namely are microcontrollfr for powering the circuit. This is an active low output pin. ADC has 8 bit resolution. I am also including CS signal to give you a clear picture.

I have not tested on the actual hardware but i have done the simulation in proteus and it works. They are data register and command register. For an ADC with resolution of 8 bits, the step size is To use the internal clock a capacitor and resistor is connected to pin 19 and 4 as shown in the circuit diagram. There is a universal rule to find out how to use an IC. Keep up the good work!


Interface SD Card with Arduino. Get Our Weekly Newsletter! This pin is used to get the data out of the ADC chip. ADC is the Analog to Digital converterwhich converts analog data into digital format; usually it is used to convert analog voltage into digital format.

Some external ADC chips are ,, and there are many more. What is the problem? Step size is smallest change that can be measured by an ADC. As we have decided to make Chip select pin as low so we need not to bother about the CS signal in the timing diagram.

And by using their ADC register we can interface. We can provide it by using oscillator or by using microcontroller.

Interfacing ADC with Microcontroller

This is an input pin connected to an external clock source. The figure above shows the schematic for interfacing ADC to What is a software to create that program? Data pins are connected to port 0 of microcontroller. Output Data Bits D7-D0.

Heart rate monitor with sms alert.