{"id":1971,"date":"2024-07-12T14:00:44","date_gmt":"2024-07-12T14:00:44","guid":{"rendered":"https:\/\/iotthinghub.com\/?p=1971"},"modified":"2024-08-11T17:22:44","modified_gmt":"2024-08-11T17:22:44","slug":"12bit-adcmcp3208","status":"publish","type":"post","link":"https:\/\/iotthinghub.com\/?p=1971","title":{"rendered":"12Bit ADC(MCP3208)"},"content":{"rendered":"\n

Sometime 10bit ADC is not enough for precious calculation. In that case we have 12bit ADC i.e. MCP3208.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
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SPI Configuration<\/p>\n\n\n\n

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Here B11-B0 is the 12bit ADC value. Thus the operating logic consist of MCP3208 consists of following steps-<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Let\u2019s use two function one is only write and other is read-write.<\/p>\n\n\n\n

    \n
  1. void SPIWrite(uint8_t input) -> Only SPI write<\/li>\n<\/ol>\n\n\n
    \nvoid SPIWrite(uint8_t input)\n{\nSPDR=input;\nwhile(!(SPSR&(1<<SPIF)))\n\t{\n\t;\/\/wait until transmission complete\n\t}\n}\n<\/pre><\/div>\n\n\n
      \n
    1. uint8_t SPIReadWrite(uint8_t input) -> Both SPI write and read function<\/li>\n<\/ol>\n\n\n
      \nuint8_t SPIReadWrite(uint8_t input)\n{\nSPDR=input;\nwhile(!(SPSR&(1<<SPIF)))\n\t{\n\t;\/\/wait until transmission complete\n\t}\nreturn(SPDR);\n}\n<\/pre><\/div>\n\n\n
      So the full user-defined function for ADC read as follow-<\/p>\n\n\n
      \nuint16_t READAdc(uint8_t ch)\n{\n\tuint8_t dataHIGH,dataLOW,bytestream;\n\tSPI_PORT&=~(1<<SPI_CS);     \/\/enable latch\n\tbytestream=0b00000110;\n\tif(ch>3)\n\t\t{\n\t\tbytestream=0b00000111;\n\t\t}\n\tSPIWrite(bytestream);\n\tbytestream=(ch<<6);\n\tdataHIGH=SPIReadWrite(bytestream); \/\/send any bit to receved data\n\tdataHIGH&=0b00001111;              \/\/4bit high value\n\tdataLOW=SPIReadWrite(0xff);        \/\/send any bit to receved data\n\tSPI_PORT|=(1<<SPI_CS);             \/\/disable latch\n\treturn((dataHIGH<<8)|(dataLOW));\n}\n<\/pre><\/div>\n\n\n
      Let\u2019s make a Temperature meter with 12 bit ADC. If we use LM35 then it gives 10millivolts per degree centigrade. Since we use 12bit ADC than the resolution should be-<\/p>\n\n\n\n
                  Resolution=5\/212 <\/sup>=1.2207mV<\/p>\n\n\n\n
      So the Temperature = (12bit ADC return value) x 0.12207<\/p>\n\n\n\n
      Download the mcp3208.c & mcp3208.h file and the main program as follow-<\/p>\n\n\n
      \n#include<avr\/io.h>\n#include<stdio.h>\n#include"mcp3208.h"\n#include"lcd.h"\nint main(void)\n{\nLCD_INIT();\nADCInitx();\nfloat temp;\nuint16_t ADCValue;\nchar LCD[20];\nLCD_write_string(1,1,"ADC result Display");\n\twhile(1)\n\t\t{\n\t\t\tADCValue=READAdc(3);\n\t\t\ttemp=ADCValue*0.12207;\n\t\t\tsprintf(LCD,"Temperature=%.2f",(double)temp);\n\t\t\tLCD_write_string(1,2,LCD);\n\t\t}\nreturn 0;\n}\n<\/pre><\/div>\n\n\n
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      download<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
      \n
      12-bit ADC(MCP3208).rar<\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
      Sometime 10bit ADC is not enough for precious calculation. In that case we have 12bit ADC i.e. MCP3208. SPI Configuration Here B11-B0 is the 12bit ADC value. Thus the operating logic consist of MCP3208 consists of following steps- Let\u2019s use two function one is only write and other is read-write. So the full user-defined function […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-1971","post","type-post","status-publish","format-standard","hentry","category-spi"],"_links":{"self":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/1971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1971"}],"version-history":[{"count":15,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/1971\/revisions"}],"predecessor-version":[{"id":2631,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/1971\/revisions\/2631"}],"wp:attachment":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}