{"id":940,"date":"2024-06-23T14:20:30","date_gmt":"2024-06-23T14:20:30","guid":{"rendered":"https:\/\/iotthinghub.com\/?p=940"},"modified":"2024-08-11T14:52:34","modified_gmt":"2024-08-11T14:52:34","slug":"water-level-indicator","status":"publish","type":"post","link":"https:\/\/iotthinghub.com\/?p=940","title":{"rendered":"Water Level Indicator"},"content":{"rendered":"\n

Water level indicator indicates the level of water in a source. Let\u2019s build a simple program that indicate the level of water of a reserve tank and auto full when the level of water is less than 25%. We use ULN2003A driver IC that we already introduce in stepper motor. Let\u2019s look at the connection diagram<\/p>\n\n\n\n

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In this connection if water reaches that level the corresponding pin will low otherwise high. So we need to enable the internal pull-up for the input pin. The main control logic as follow-<\/p>\n\n\n\n

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float sensor(void) -> return the level of water & also turn on\/off the motor.<\/p>\n<\/div>\n<\/div>\n\n\n

\nfloat sensor(void)\n{\n     float water_level=0;     \/\/variable declear\n\tif(!(PINB&(1<<PINB0)))\n\t{\n\t water_level=100;           \/\/dipaly 100%\n\t PORTC&=~(1<<PORTC0);       \/\/load off\n\t}\n\telse if(!(PINB&(1<<PINB1))) water_level=87.5;        \/\/dipaly 87.5%\n\telse if(!(PINB&(1<<PINB2))) water_level=75;          \/\/dipaly 75%\n\telse if(!(PINB&(1<<PINB3))) water_level=62.5;        \/\/dipaly 62.5%\n\telse if(!(PINB&(1<<PINB4))) water_level=50;          \/\/dipaly 50%\n\telse if(!(PINB&(1<<PINB5))) water_level=37.5;        \/\/dipaly 37.5%\n\telse if(!(PINB&(1<<PINB6)))\n\t{\n\t water_level=25;          \/\/dipaly 25%\n\t PORTC|=(1<<PORTC0);       \/\/relay on\n\t}\n\treturn water_level;\n}\n<\/pre><\/div>\n\n\n
The function returns a floating value type and On\/Off the Motor but in LCD there is a problem to display floating point variable. So we need to modify in MFile that-<\/p>\n\n\n\n
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We can use sprintf function or can use standard library function under<\/p>\n\n\n\n
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format: dtrostrf(float_value, minimum_width, num_digits_after_decimal, string);<\/p>\n\n\n\n
i.e dtostrf(float, 6, 3, string); -> xxxxxx.xxx -> [6 digits].[3 decimal]<\/p>\n\n\n\n
The main program as follow-<\/p>\n\n\n
\n#include<avr\/io.h>\n#include<util\/delay.h>\n#include<stdlib.h>\n#define INPUT_DDR     DDRB\n#define INPUT_PORT    PORTB\n#include"lcd.h"        \/\/ PORTD as LCD port\n#include"input.h"      \/\/ PORTB as input with internal pull-up\nchar level[6];\nint main(void)\n{\nDDRC|=(1<<DDC0);      \/\/output pin for relay control\nLCD_INIT();\nLCD_Clear();\nINPUT_DDR=0x00;       \/\/ All port are input\nINPUT_PORT=0xff;      \/\/ Internal pull-up activate\nfloat Value=0.00;\nwhile(1)\n\t{\n      Value=sensor();\n\t  dtostrf(Value,3,2,level);\n\t  LCD_write_string(1,1," Resorver Water ");\n\t  LCD_write_string(1,2,"water level=");\n\t  LCD_write_string(13,2,level);\n\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
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Download the full program with proteus simulation<\/a><\/strong><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Water level indicator indicates the level of water in a source. Let\u2019s build a simple program that indicate the level of water of a reserve tank and auto full when the level of water is less than 25%. We use ULN2003A driver IC that we already introduce in stepper motor. Let\u2019s look at the connection […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-940","post","type-post","status-publish","format-standard","hentry","category-i-o-port-operations"],"_links":{"self":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/940","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=940"}],"version-history":[{"count":13,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/940\/revisions"}],"predecessor-version":[{"id":2545,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/940\/revisions\/2545"}],"wp:attachment":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=940"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=940"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=940"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}