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| en:examples:sensor:potentiometer [2015/11/09 13:47] – heikopikner | en:examples:sensor:potentiometer [2020/07/20 09:00] (current) – external edit 127.0.0.1 | ||
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| Line 1: | Line 1: | ||
| - | ~~PB~~ | + | < |
| - | ====== | + | ====== |
| - | //Necessary knowledge : [HW] [[en: | + | //Necessary knowledge: |
| + | [HW] [[en: | ||
| + | [ELC] [[en: | ||
| + | [AVR] [[en: | ||
| + | [LIB] [[en: | ||
| ===== Theory ===== | ===== Theory ===== | ||
| Line 20: | Line 24: | ||
| * unsigned short adc_get_value(channel) | * unsigned short adc_get_value(channel) | ||
| * unsigned short adc_get_average_value(channel, | * unsigned short adc_get_average_value(channel, | ||
| + | |||
| + | The function // | ||
| + | |||
| + | The following functions of the library are provided to support the ATmega2561 ADC converter. | ||
| ~~CL~~ | ~~CL~~ | ||
| <code c> | <code c> | ||
| - | // | ||
| // Starting the ADC | // Starting the ADC | ||
| - | // | ||
| void adc_init(adc_reference reference, adc_prescale prescale) | void adc_init(adc_reference reference, adc_prescale prescale) | ||
| { | { | ||
| Line 36: | Line 42: | ||
| } | } | ||
| - | // | ||
| // Converting the values of selected channel | // Converting the values of selected channel | ||
| - | // | ||
| unsigned short adc_get_value(unsigned char channel) | unsigned short adc_get_value(unsigned char channel) | ||
| { | { | ||
| Line 57: | Line 61: | ||
| } | } | ||
| </ | </ | ||
| - | The function // | ||
| - | In previously explained example program analogue-digital converter and 7 segment number indicator library are used. The 10 bit value of analogue-digital converter is multiplied by 10 and divided by 1024 to get the value between 0 and 9. The value 10 is impossible to reach because while dividing in C-language only integer value is calculated and not rounded result. Function of averaging the result of converter is used to get more accurate result. Derived from this the operating program shows the numbers 0 to 9, which correspond to the position of the potentiometer on the indicator. | + | In previously explained example program analogue-digital converter and 7 segment number indicator library are used. The value of analogue-digital converter is multiplied by 10 and divided by 2048 to get the value between 0 and 9. The value 10 is impossible to reach because while dividing in C-language only integer value is calculated and not rounded result. Function of averaging the result of converter is used to get more accurate result. Derived from this the operating program shows the numbers 0 to 9, which correspond to the position of the potentiometer on the indicator. |
| + | It should be noticed where is connected to the analog potentiometer in the particular hardware. For example, it is connected to an analog channel 3 in case of the Homelab Sensor Module II and analog channel 15th in case of the Home Labor III Interface module. | ||
| <code c> | <code c> | ||
| - | // | ||
| // Example program of potentiometer on the Sensor module | // Example program of potentiometer on the Sensor module | ||
| // The position of the potentiometer is displayed on the 7-segment indicator | // The position of the potentiometer is displayed on the 7-segment indicator | ||
| - | // | ||
| #include < | #include < | ||
| #include < | #include < | ||
| Line 76: | Line 78: | ||
| #define ADC_CHANNEL 15 | #define ADC_CHANNEL 15 | ||
| - | // | ||
| // Main program | // Main program | ||
| - | // | ||
| int main(void) | int main(void) | ||
| { | { | ||
| Line 87: | Line 87: | ||
| // Adjusting ADC | // Adjusting ADC | ||
| - | adc_init(ADC_REF_AVCC, | + | adc_init(ADC_REF_AVCC, |
| // Endless loop | // Endless loop | ||
| - | while (true) | + | while (1) |
| { | { | ||
| // Reading 4 times rounded values of the channel | // Reading 4 times rounded values of the channel | ||
