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timer digital To create a realtime timer, realtime microcontroller is not required (RTC). You only need a crystal and a timer prescale settings. for example, if used for 8MHz crystal, then choose the timer prescale of 8. Prescale is a divisor which will be conditional on crystal beats as needed. timer frequency = frequency of crystal / prescale so, timer frequency = 1MHz since T = 1 / F, then T = 1US This means that every single wave oscillation takes 1US. To simplify the calculation, the timer0 registers (TCNT0) shall be 155. TCNT0 then oscillates between 155 to 255. so that any overflow occurs, the timer has counted 100us. when made variable “x” to be in increments of each of the Overflow occurs when x = 10, the timer value is 1ms. and if each x = 10 will raise the value of variable “y”, then “y” is the timer value in ms. (In experiments conducted used ATMega8535 with 8MHz crystal).
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Analog to Digital Converter (ADC) on ATMega8535
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ATmega8535 provides the ADC with a resolution of 10 bits. ADC is connected to 8 channel Analog Multiplexer which allows formed eight single-ended input voltage is ADC0 to ADC7. Can also be configured into seven differential input channels with ADC1 as the common terminal and the other negative as a positive voltage input. Or a second differential input channels with a choice reinforcement (gain) 10x or 200x, ie ADC1, ADC0 and ADC3, ADC2. the use of ADC atmega8535 ADC has an analog supply voltage pin separate AVCC. AVCC voltage is ± 0.3V of VCC.-
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- analog to digital converter
- atmega
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Minimum System ATMega 8535,16,32 Minimum system ATmega 8535/16/32 schematic circuit that is integrated with RS232 serial communication. Minimum System is a microcontroller circuit that used to work. This circuit usually consists of: 1. Crystal = to generate pulse 2. a series reset = to do the “Restart” work microcontroller Components that can be used as input and output such as: 1. display = LCD, dot matrix, seven segment, etc. 2. input = keypad, push button, etc. Schematics above are the minimum system that has been integrated with RS232 serial communication. with the RS232, then the minimum system is ready to be used to communicate between the microcontroller to the computer, or microcontroller to microcontroller.
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- avr atmega
- boards
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