Project ideas

Submitted by patrik on Thu, 2011-01-13 13:14

-Big volume nob for the computer. Maybe a big red panic button that mutes the sound? Or a device that auto mutes when the phone rings (complicated with cell...).

Low-volt home network

Submitted by patrik on Tue, 2011-01-11 15:27

The aim of this project is to create a low-voltage network in my home.
I use a lot of led lights. They like low voltage, and I don't like mains attached adapters everywhere. Better to run a low-voltage line where they can be connected.

First test with Atmega168

Submitted by patrik on Tue, 2010-10-26 15:26

sudo avrdude -p m168 -c avrispv2 -P usb -t

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1eff06
avrdude: Expected signature for ATMEGA168 is 1E 94 06
Double check chip, or use -F to override this check.

Works better with the "-B" option:

sudo avrdude -p m168 -c avrispv2 -P usb -t -B 32

Pic controlled fan

Submitted by patrik on Wed, 2010-10-13 09:40

This construction is used to control a 120mm computer fan. The fan is mounted in a vent in the wall, and turns on and off depending of how hot it is in the room. There is a LDR to which can be used to stop the fan from running when it's dark (ie when you're sleeping), but it's not used in my firmware. The potentiometers are used to control at what temperature the fan will turn on and how long it will be running at each time.

Bad caps

Submitted by patrik on Fri, 2010-09-24 16:43

Many electronic gadgets die and become unusable. The reason is often "bad caps", electrolytic capacitors that are failing. In some cases this is impossible to see, but in many cases a bad cap is physically damaged. A probably good cap:


Some bad ones:


VUSB and SHT11

Submitted by patrik on Fri, 2010-06-04 10:15

The SHT11 is a sensor for humidity and temperature. This unit will read this values and send them to the computer.
Status: Code in progress, need to buy a AVR with more memory (Tiny861, Mega88 or something).

VUSB with LCD

Submitted by patrik on Fri, 2010-06-04 10:13

A project in planning. The goal is to create a computer controlled LCD. There are some projects out there which does this but this projects will use a 4-bit LCD-connection.
Status: Trying to build a working firmware.

VUSB and UART

Submitted by patrik on Fri, 2010-05-21 17:07

A little project with not much use. The circuit connects to the PC:s USB-port via V-USB. It also connects to the serial port via RS232. The PC-code can send two different messages to the AVR (ATTiny2313) via USB, the AVR responds by sending one of two messages to the PC's serial port. This device is powered from USB, no external powersource is used.
The point? It can be used in testing, where debug-messages are sent to the serial port.