Hi, I am a new comer to the field of microcontrollers and doing some simple projects to get familiar with microcontrollers. Currently i am embarking on using the AT89C4051 as an ADC . I am actually trying to use the application notes provided by the following website: h**p://www.atmel.com/dyn/resources/prod_documents/DOC0524.PDF It would be very useful if someone were to help me with the coding (C-program) for the application. I have tried a few times but have failed. Your help would be greaatly appreciated. I have done the conections for the ADC conversion and had connected the positive voltage of the signal to Pin 1.1. and i wrote a very simple program, that would be able to output voltage reading on the LEDs,. The program is of as follows: #include<AT89x051.h> char a[10]={0x03,0x13,0x23,0x33,0x43,0x53,0x63,0x73,0x83,0x93}; /* The numbering from 0-9*/ void main(void) {int j, adc_data; while(1){ P1_1=adc_data; P1=a[adc_data%10]; for(j=0;j<30000;j++); } } I do always get a zero on my LED display, no matter how i changed the voltage input, Could someone please help.I am struggling with this for a few days. Thank you
Gast
#258788
Vinash, are you sure you understood the schematic in the application note ? I don't want to be the spoil sport but it looks like your lack of C programming skills is not your only problem : 1. you have no I/O port setup at all 2. the schematic shows you'll have to toggle pin 1.2 and 1.3 to generate the clock signals that make the displays latch the data setup on pin 1.4 .. 1.7 3. your code assign a value to a pin/port rather than reading from it I recommend to start trying to figure out how to do the initial setup first (reading the uC datasheet might be helpfull). Daz
Gast
#258789
Hello Vinash, the Daz may be right, perhaps you should start with some µC basics, like toggling I/O pins and switching simple LEDs before you start with AD conversion. Which development environment / C-Compiler do you use? Markus_8051