{"id":499,"date":"2024-06-22T12:05:22","date_gmt":"2024-06-22T12:05:22","guid":{"rendered":"https:\/\/iotthinghub.com\/?p=499"},"modified":"2024-08-10T17:58:29","modified_gmt":"2024-08-10T17:58:29","slug":"relay-control","status":"publish","type":"post","link":"https:\/\/iotthinghub.com\/?p=499","title":{"rendered":"Relay Control"},"content":{"rendered":"\t\t
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I\/O stands for Input\/Output function. Example ATmega8 has 23 Programmable I\/O Lines that can define as both input and output device. The I\/O registers bellow-<\/p>

\"\"<\/p>

Let\u2019s build our first program that content<\/p>

\"\"<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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DDRx(Data Directions Register x) define the I\/O initialization condition. If DDRx-> 1(set) the Output and DDRx-> 0(clear) Input.<\/p>

\"\"<\/p>

\"\"Conditional operator<\/h5>
\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 expression ? True execution : False execution;<\/strong><\/h6>
Example:-\u00a0 \u00a0 \u00a0 \u00a0x=(a>b) ? a:b;<\/h6>

If the expression is true than x=a<\/p>

If the expression is false than x=b<\/p>

In C language we can check whether the pin is logic 1 or logic 0. The C format is to check if the bit is set<\/p>

C:\\>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (register_name&(1<<bit_number))<\/strong><\/h6>

Let check how it works-<\/p>

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Suppose the default value of PINB=0b11110001. Now from the fundamental of C as we know non-zero is true and zero is false.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Similarly to check if the bit is clear<\/p>

C:\\>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 !(register_name&(1<<bit_number))<\/strong><\/h6>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Let\u2019s go to our main program. In real life after we press a switch there is a debouncing effect. So we need some delay function for every time switch is pressed. AVR has build in function that control delay operation.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\"\"<\/p>

Full Code-><\/p>

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In programming we use the delay function to avoid noise but in real life we can minimize the noise effect by using capacitor or RC\/LC circuit that is called filter. Noise reduces the lifecycle of the switch so if possible use RC filer circuit.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t<\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tdownload<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Download the full program with proteus simulation<\/a><\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

I\/O stands for Input\/Output function. Example ATmega8 has 23 Programmable I\/O Lines that can define as both input and output device. The I\/O registers bellow- Let\u2019s build our first program that content DDRx(Data Directions Register x) define the I\/O initialization condition. If DDRx-> 1(set) the Output and DDRx-> 0(clear) Input. Conditional operator \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 expression […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,9],"tags":[],"class_list":["post-499","post","type-post","status-publish","format-standard","hentry","category-basic-phepharials","category-i-o-port-operations"],"_links":{"self":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/499","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=499"}],"version-history":[{"count":52,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/499\/revisions"}],"predecessor-version":[{"id":2528,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/499\/revisions\/2528"}],"wp:attachment":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}