Circuits & Schematics Microcontrollers Usage: clock - 7

61. µProg - tiny, fast, portable AVR programmer with SD. Part 3. Software, Memory card, files, Firmware update, Demonstration
    Circuits Microcontrollers Usage
    .. test. I suggest to use not longer cable than 20cm. Given SCK values apply when programmer chip runs at 8MHz. ISP assistant clock signal Because programmer is battery-powered, i resigned from using the standard feature of VCC pin (pin 5 in 6 ...
    29-06-2011

62. Experimenter's board for Enhanced Mid-Range PIC microcontrollers (PIC16F1827 and PIC16F1847). Part 2. Testing of the board
    Circuits Microcontrollers Usage
    .. on the board. We will connect them to PORTA and PORTB of PIC16F1827 . The microcontroller will run at 500 KHz internal clock, so you can take the ceramic resonator out from its slot. You should use jumper wires to make the following ...
    30-06-2011

63. Voltage monitor for car's battery and its charging system. Part 1. Schematic
    Circuits Measurement Microcontrollers Usage
    .. and the decimal point (DP) are driven through PORTB of PIC16F1827. The microcontroller runs at 500 KHz using the internal clock source. The ULN2003 darlington array provides current sink to each of the common cathodes of the seven segment ...
    18-07-2011
64. 16x8 LED Matrix Display
    Circuits Microcontrollers Usage Microchip PIC18F2550
    .. The 16×8 LED Matrix clock was a project I built for my office. I wanted to have a clock for my desk which was a little unusual. I decided ...
    29-08-2011
65. Add 512K of external SRAM to Arduino Mega. Part 1 - Theory
    Circuits MCU Open-Source Platforms Microcontrollers Usage Arduino Arduino Arduino Mega
    .. and saved 8 pins in the process. When choosing a latch we must ensure that it is fast enough to cope with the 16Mhz core clock of the Arduino. 74HC series latches are too slow. The datasheet recommends that we use the 74AHC series. ...
    13-09-2011
66. MakerBot Watch - portable Arduino environment
    Circuits Domestic MCU Open-Source Platforms Microcontrollers Usage Arduino
    .. lots of support #defines,MakerBotWatch.cpp source for MakerBotWatch class defintions,watch_test.pde test sketch for simple clock using MakerBotWatch class, MakerBotWatch_V1.1.h a slightly modified header file, MakerBotWatch_V1.1.cpp a ...
    23-12-2011
67. Intelligent Fan Controller. Part 1 - Schematic
    Circuits Computers and Peripherals Microcontrollers Usage
    .. standard. The buzzer is used to make an audible alarm when a fan or sensor has failed. The crystal (X1) provides the 20MHz clock and the USB connector is wired directly to the USB transceiver within the micro. The 5V provided by the ...
    15-03-2012
68. ATtiny45/85 Servo Library
    Circuits Microcontrollers Usage Robots Power
    .. other ATtiny microcontrollers, such as the ATtiny15, but I haven’t checked. Supports only 5 servo.* Supports only one clock frequencies: 8MHz. Supports only pins on Port B. Which is only port available on the ATtiny45/85. Uses timer0 ...
    31-10-2011
69. Canon DSLR IR Remote
    Circuits Microcontrollers Usage ATtiny2313A
    .. is a little too powerful, but first tests with ATtiny13 revealed some issues with internal oscillator. The timing of the clock signal is crucial when generating a carrier wave. Carrier should have 32.6kHz frequency for the best results. ...
    21-11-2011
70. The simplest possible RFID emulator. Part 1 - Schematic and Firmware
    Circuits Wireless Microcontrollers Usage
    .. instead of using the internal oscillator, the firmware uses the RFID carrier, present in the GP5 pin, as the system clock. This way, the firmware is simpler because there is no need to synchronize the data modulation (switching the ...
    25-11-2011

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