Circuits & Schematics - Microcontrollers Usage: avr - 3

21. AD9833-based USB Function Generator
    Circuits Oscillators Measurement Microcontrollers Usage
    .. make one myself. I found a pretty common DDS (direct digital synthesis) chip, called AD9833 . Then just strap a USB-enabled AVR micro there and maybe some analog electronics. This board doesn't do any of the special analog magic to allow for ...
    Oct 15, 2012

22. Intelligent temperature monitoring and control system using AVR microcontroller. Part 2 - Firmware
    Circuits Automation Microcontrollers Usage
    .. with key press is made universal throughout the entire code. The adc_avg() function takes 64 samples of channel 0 of the AVR’s built-in ADC and makes the average of these samples to reduce noise and ensure accuracy. This function ...
    Aug 15, 2012

23. Intelligent temperature monitoring and control system using AVR microcontroller. Part 1 - Schematic
    Circuits Automation Microcontrollers Usage
    .. utilize it intelligently unlike analogue controllers. Figure 1. Intelligent temperature monitoring and control system using AVR microcontroller. Here are the features of our controller: Audio-visual setup for setting temperature limits. Fault ...
    Aug 14, 2012
24. Implementing Discrete Fourier Transform in Atmega32 to make an audio spectrum analyzer
    Circuits Audio Measurement Microcontrollers Usage
    .. I am not an expert. Now I did a small audio spectrum analyzer(0 - 10KHz) on a 16×2 character lcd using an Atmel AVR ATmega32 microcontroller. Since I am refreshing from the basics, so I started with simple DFT. Also, I believe I ...
    Jun 21, 2012
25. USB password generator
    Circuits Security Microcontrollers Usage
    Having done half a dozen V-USB tutorials I decided it’s time to whip up something cool. As USB keyboards were an area untouched, I decided to make a small USB HID keyboard device that types a password stored in EEPROM every time it’s ...
    May 30, 2012
26. DSS Function Generator on AD9833
    Circuits Oscillators Microcontrollers Usage AD9833
    This project didn’t look complicated but it was. The MCU part is really simple: just some code for the Display, Keypad and DDS Communication. A DDS AD9833 from Analog Devices is a chip that is driven by a hi-frequency oscillator. I used a 50 ...
    Apr 23, 2012
27. mini Logic analyzer on AVR Microcontroller
    Circuits Measurement Microcontrollers Usage
    .. Switch on the S1 to power on the electronic circuit. After the initial screens on LCD you will see a message that the Atmel AVR ATmega8 waits for a signal change on input pins. The AVR has 4 external pull-down resistors 33k (R2-R5) avoiding ...
    Feb 26, 2012
28. Interfacing a KS0108 based Graphics LCD. Part 2 - Schematic, Firmware for the PIC microcontroller to initialize the GLCD
    Circuits Microcontrollers Usage
    Part 1 - Theory Circuit diagram The circuit diagram for this experiment is shown below. The PIC16F887 microcontroller is used to drive a Winstar WDG0151-TMI GLCD. The data pins are connected to PORTD and other control signals are driven through ...
    Feb 7, 2012
29. A Universal RFID Key. Part 2 - Schematic and PCB
    Circuits Security Wireless MCU Open-Source Platforms Microcontrollers Usage Arduino
    Part 1 - How does RFID work, Whats stored on the card So the next step was to identify how to pretend to be a card - I wanted a card that I could type a card number into, so it had to have a microprocessor on it, was well as a keypad to allow the ...
    Jan 28, 2012
30. A Universal RFID Key. Part 1 - How does RFID work, Whats stored on the card
    Circuits Security Wireless MCU Open-Source Platforms Microcontrollers Usage Arduino
    RFID projects have been pretty prominent recently, ranging from projects here in Instructables, to our local Silicon Chip magazine in Australia publishing a RFID door lock project in their November issue. Even I recently purchased a RFID door lock ...
    Jan 27, 2012

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