Here's the task. Create program polling ADC at 10 Hz and outputs the measured voltage in volts to the 7-segment indicator block.

• Segment X and Y shows millivolts
• Segment Z shows volts

Electrical circuit connection of segments:

I recommend use potentiometer/variable resistor

It's important. We are going to use interrupt.

	ISR(ADC_vect){
		unsigned int value;
		TIFR|=(1<<OCF1B); // Output Compare 1 B
		value = ADCH;  // 8bit 0-255
		value = value*0.02; // range 0...5.1 V
		adcSEG(value); // from headfile indicator.h		
	}

This is mathematical equation for init range of voltemeter:

	value = value*0.02;

It's example of creation simple digital voltemeter using AVR Microcontroller ATmega16. We are going to make a 5V range digital voltmeter using ADC in ATmega16. Don't forget to use datasheet!

0. You can use another MCUs. All you need is datasheet. Don't forget change pins!
1. Make project in AVR Studio choosing 8-bit MCU ATmega16.
2. Copy code from adc_voltemeter.c into your main.c file.
3. Add headfile indicator.h in project.
4. Build project.

Free