Circuits & Schematics Microcontrollers Usage: clock - 9

81. Intelligent temperature monitoring and control system using AVR microcontroller. Part 1 - Schematic
    Circuits Automation Microcontrollers Usage
    .. Intelligent temperature controller For this design I used an Atmel AVR ATMega32L AVR microcontroller with an internal clock frequency of 8MHz, a 4×20 LCD for presenting data visually, a 4-button input interface, a tiny piezo ...
    14-08-2012

82. Low cost Ethernet shield with ENC28J60
    Circuits Interfaces MCU Open-Source Platforms Microcontrollers Usage Networks Arduino ENC28J60
    .. the Arduino. MISO is the output data of the slave device and the input of Arduino, while MOSI is the opposite; SCK is the clock that marks the two-way communication on the SPI bus and RESET the reset line, which is also connected to a ...
    23-08-2012

83. AD9833-based USB Function Generator
    Circuits Oscillators Measurement Microcontrollers Usage
    .. The parts The integral part of this design is ofcourse the DDS chip, the AD9833 by Analog Devices . The chip has a 25MHz clock input, an internal phase locked loop, a sine lookup table and an ADC. By controlling it with it's SPI ...
    15-10-2012
84. A DIY indoor thermometer plus hygrometer with adaptive brightness control implemented to 7-segment LED displays
    Circuits Measurement Microcontrollers Usage
    .. and relative humidity. The microcontroller used in this project is PIC16F688 from Microchip , and it runs at 4 MHz clock generated from its internal source. A separate display driver chip ( MAX7219 ) from Maxim is used to control ...
    18-01-2013
85. Linearize optical distance sensors with a voltage-to-frequency converter
    Circuits Automation Measurement Microcontrollers Usage
    .. response: where S F is a coefficient. The pulse period is The microcontroller defines the period as a number of internal clock pulses, The period of clock pulses is 0.5 usec, and it defines the values of the frequency-determining ...
    10-02-2013
86. Read 10 or more switches using only two I/O pins of a microcontroller
    Circuits Microcontrollers Usage
    .. (a cascadable decoded 1-of-10 Johnson counter) for reliable operation should an EMI or ESD event occur that could falsely clock the counter, or you can use the circuit shown in Figure 2 and retain the two-pin feature. The diodes isolate ...
    11-03-2014
87. Voice Shield for Arduino
    Circuits Audio MCU Open-Source Platforms Microcontrollers Usage Arduino Winbond ISD1790PY
    .. × 100 V C11 2.2 uF × 63 V LD1 LED 3 mm Red U1 ISD1790PY P1 P7 Microswitch Recording time is determined by the clock frequency of ISD1790PY internal oscillator, which marks the sampling; such sampling frequency is defined by the ...
    24-03-2013
88. One I/O line drives shift register with strobe. Part 1 - Schematic
    Circuits Microcontrollers Usage
    .. other words, they can be used as (additional) general purpose outputs. Today there are shift registers that have DATA and CLOCK inputs only, like 74HC164 , and shift registers with same inputs plus STROBE control input, like 74HC4094 or ...
    13-04-2013
89. AVR frequency meter - from 1Hz to 10MHz
    Circuits Measurement Microcontrollers Usage Atmel ATtiny2313
    .. I put in the attachment. Figure 2. AVR frequency meter Schematic Diagram Resolution vs accuracy Accuracy depends on the clock source with which meter is fed. The code itself can occasionally add one pulse at very high frequencies, but it ...
    17-05-2013
90. Connect a 4×3 matrix keyboard to a microcontroller using two I/O pins
    Circuits Interfaces Microcontrollers Usage
    .. One CD4017 is used to control the keyboard rows, while the other is used to control the columns. The MCU generates a clock signal and feeds it to the counter IC controlling the columns. Initially, the 0th output of the column counter ...
    20-05-2013

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