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This project focused on creating a simple serial data logger for the Delorme Tripmate (also known as the GPSTripmate). The Tripmate is an older GPS receiver that can be purchased on eBay for <$20.The plan was to create a GPS data logger that would record the position of the unit and allow to read back the latitude and longitude after acquiring the data. [via]
PIC16F88 Delorme Tripmate GPS Logger - [Link]
This article shows you how to build a digital thermometer from the beginning to the end, using a thermistor and a 8051 microcontroller.Being based on tutorial about Analog to Digital conversion on this website , it is very easy to understand the functioning of the device, and you can build it with any microcontroller even if it doesn’t have a builtin ADC.This digital thermometer built with the AT89S52 microcontroller. [via]
AT89S52 based Digital Thermometer - [Link]
This Tengu clone (Tengu is a toy created by artist / designer Crispin Jones that responds to sound from your computer and makes appropriate facial expressions based on the output) uses a custom-designed PCB with some pretty detailed instructions on how to build your own at the link below. [via]
New Tengu clone in a PCB version - [Link]
Martin Paul writes:
The FX120 will need a little help on the bottom end. The goal was to let them go down to about 50 Hz. With the Mathcad worksheets I designed a Mass Loaded – Tapered Quarter Wavelength Tube (ML-TQWT). Afterwards I contacted M.J. King and asked him to have a look at the simulation I had completed. With his feedback “I think you have a design” (I want to thank Mr. King for his kind help and advice) I made some test enclosures out of chipboard. Figure 1 shows the calculated frequency response for the FX120 for the enclosure shown in Figure 2.
Fostex FX120 MLTL Speaker Project - [Link]
To share a regional type USB as a printer, scanner, etc. Two computers, it is relatively easy affair. Simply connect the two computers in a network device, and say the printer as a shared. This method, however, requires the continuous operation of the computer that has the printer connected. The solution to this problem is to give the circuit that you, as it has the ability to transfer the printer to either computers we, as the printer is connected to one of two computers, but in our construction. [via]
USB switch - [Link]
This AVR Programmer is a very valuable tool. Not only does it allow you to program you AVR’s with ease, you can update your program without having to remove the AVR (very use full when working with surface mount devices). Also, it allows you to use one tool to program possibly every AVR available today. [via]
Simple ISP AVR programmer - [Link]
This robot control by PIC16F818 which has a lot of features that work well in this situation. As you can see from the Schematic and Source Listing, position pulses for the 2 servos are generated dirctly from the PIC. Also, the room light level, battery condition, and servo power draw (indicating mechanical loading) can be measured with the internal ADC. [via]
Beam Robot - [Link]
This is a standalone temperature and fan monitoring and control unit for the PC. It uses the temperature readings to adjust fan speeds in order to regulate temperature and noise. The system is flexible in that it can be configured to be either completely autonomous, or set up to be configurable. It is also highly configurable in the setting up of the features and parameters. The entire unit is controlled by the 2 Atmel Mega32 MCUs – 1 for the main control unit and 1 for the RF remote control, with inputs to the ADC (for thermal sensors), port pins, RS232 serial connection and output to the LCD, port pins and RS232 serial connection. The RF remote control controls specific settings of the unit. The main unit is powered off a standard 4-pin PC Molex power connector while the remote control is powered off a 9V battery. [via]
PC temperature control - [Link]
This project was designed and implemented an electronic phone directory which has a built-in automatic dialer. The electronic directory allows user to Dial, Enter, Search and Delete entries. When dialing, the Atmel 8515 microcontroller will generate the Dual Tone Multi Frequency (DTMF) signals corresponding to the phone number being dialed. To avoid building the phone circuit for the dialer, a DTMF decoder was used to detect what number is dialed by the user. [via]
Electronic Phone Directory and DTMF Generator – [Link]
In this flashlight, each LED/resistor combination consumes 4.5volts at 30mA or about 135mWatts. The ballast resistor alone consumes 1.1volts at 30mA or about 33mWatts. Therefore, 25% of the power being drained from the batteries is lost in the resistor of each LED chain. [via]
A low power, long life LED flashlight circuit - [Link]
