switch • Tech Projects

Atmel AVR-firmware based universal USB-Interface using ATTiny2313

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Scanning the web on microcontroller based USB solutions, I stumbled over Objective Development’s freeware USB solution based on Atmel’s AVR architecture. I decided to build up their reference design PowerSwitch with an ATTiny2313 MCU. Since I never used AVR chips before, the first challenge was to set up a code development environment enabling me to modify the firmware to […]

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How to interface LED with AVR Microcontroller (ATmega16)

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ATmega16 has 32 I/O pins to communicate with external devices. Before interfacing with external devices, these pins must be cofigured as input or output pin. This article demonstrates the basic I/O operation of ATmega 16 using LEDs. All the four ports can be configured to read an input from some external device or to give output to

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AVR Dual RGB Matrix Driver Using Atmega

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Multiplexing LEDs can be tricky, but we’re working with RGB LEDs, so think of each RGB as three individual LEDs. For an 8 x 8 matrix, that is 192 total LEDs on a single matrix. Even though there are only 32 connection pins, it is still possible to individually control the color and brightness of

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USB PORT RELAY CONTROL WITH ATMEL ATMEGA8

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6 relay control units can be made via the usb port usb drive computer program code and schema files are pcb circuit to regulate the supply 9-12 volt ac section there on the SPI… Electronics Projects, USB Port Relay Control with Atmel Atmega8 “atmega8 projects, avr project, microcontroller projects, “ 6 relay control units can be made via the

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Instructables Hit Counter (ESP8266-01) Using Atmega

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Some time ago, I tried to make an “Instructables Hit Counter” using the Instructables API, and an Arduino Uno with a wired network shield. However, with the limited RAM of the Arduino Uno, I was unable to get the system to work. A while ago, I noticed

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MQTT and Wifi Powered Mailbox Flag Using Atmega

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Note: updated with new firmware, a schematic and a tips for a programmer. A couple of years I embarked on my own home automation project. It started off by building a server controlled 433 MHz transmitter build with an Arduino to switch lots of

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Door Chime Privacy Sentry using Attiny12

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An ATtiny12 controller as a timer and some switching circuitry turns the doorbell off for 10 hours at the same time each day. The string of resistors across the top of the board are series connected to make a 728 Ohm 2 watt resistor. The slide switch is used to switch the circuit between the

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Home Security System Using Atmel Mega32

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Introduction This is a digital home security system with voice feature which can monitor room temperature, smoke, motion, and windows & doors. The goal of this project is to utilize the after-market parts and build an integrated home security system. Besides traditional magnetic switch equipped on doors and windows, we have also incorporated temperature sensor,

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MODAS: Magnetic Open Door Alert System Using Atmega

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Hey fellow DIY’ers. Have you ever found your house door open after returning from a long trip? Me neither. But it is always good to have a safety system in our houses. I’m not talking about the old school projects like a laser trip wire, no no, that’s boring. This is something from the future.

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Analog audio panel for PC using ATMega328 microcontroller

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Have you ever struggled with audio settings in control panel in middle of a VoIP call? Or, wondered if the other guy can hear you properly? I have. My work requires great deal of remote conference calls using PC. The first thing I wonder always when starting is if my audio settings — mic volume,

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