All AVR ports have true Read-Modify-Write functionality when used as general digital I/O ports. This means that the direction of one port pin can be changed without unintentionally changing the direction of any other pin with the SBI and CBI instructions. The same applies when changing drive value (if configured as output) or enabling/disabling of [...]
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Analog to Digital Converter (ADC) in AVR ATMega 8535
• 10-bit Resolution • 0.5 LSB Integral Non-linearity • ±2 LSB Absolute Accuracy • 65 – 260 ?s Conversion Time • Up to 15 kSPS at Maximum Resolution • 8 Multiplexed Single Ended Input Channels • 7 Differential Input Channels • 2 Differential Input Channels with Optional Gain of 10x and 200x(1) • Optional Left [...]
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Serial Peripheral Interface (SPI) in AVR ATMega 8535
The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer between the ATmega8535 and peripheral devices or between several AVR devices. The ATmega8535 SPI includes the following features: • Full Duplex, Three-wire Synchronous Data Transfer • Master or Slave Operation • LSB First or MSB First Data Transfer • Seven Programmable Bit Rates • End [...]
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16-bit Timer1 / Counter1 in ATMega 8535
The 16-bit Timer/Counter unit allows accurate program execution timing (event management), wave generation, and signal timing measurement. The main features are: • True 16-bit Design (i.e., Allows 16-bit PWM) • Two Independent Output Compare Units • Double Buffered Output Compare Registers • One Input Capture Unit • Input Capture Noise Canceler • Clear Timer on [...]
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Interrupt Vectors in ATmega8535
This section describes the specifics of the interrupt handling as performed in ATmega8535. For a general explanation of the AVR interrupt handling, refer to “Reset and Interrupt Handling” Vector No. Program Address Source Interrupt Definition 1. 0×000 RESET External Pin, Power-on Reset, Brown-out Reset and Watchdog Reset 2. 0×001 INT0 Interrupt Request 0 External 3. [...]
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potentiometer : water level sensor
When the water level changes, the float will drop following the water level.this causes the potentiometer rotates.This system is designed to detect water levels from 0 to 10m.when the water level is 0 meters, then the potentiometer resistance is minimal (0 ohms) and maximum (10 kohm) when the water level = 10 m. Changes in [...]
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Analog to Digital Converter (ADC) on ATMega8535
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 [...]
