Do you ever get involved with the data acquisition and logging system? For those that have didn’t familiar with the data acquisition and logging system, it is a device that has been specially designed to measure and log some parameters. The main purpose of the data acquisition system is analysis the logged data and improves the object of measurements.

Most of the data acquisition and logging system is electronic based, where it can be made of hardware, software or both of them.

Let’s pay your attention on this project. The data acquisition and logging system is based on AT89C51, where it’s a microcontroller project log the temperature system. It can be used to monitor and control environment temperature.

The things should know about this project is although it’s controlled by AT89C51, but it managed to control the status and temperature date saved to PC via serial communication without any hassle! Eight temperature sensors are connected to this project, where four of them were shown in diagram for simplicity.

You can easily detect values of all the sensors, as the software “DAQ System” takes the values and show them on its front panel. Furthermore, the high limit and low limits are for the alarm, where the alarm will turned on automatically, if the temperature went above high limit or below low limit!

Do you have interested on laser projector and always wondering how does it work? You maybe think that developing a laser projector project will cost you a lot of money. Ok, if you are being told that you could create a lost cost laser projector, would you like to build one for yourself here?

The main objective of this laser projector is to create a character projector, which it can be used to interface to a mobile device or even linked to a PC via a serial port. By simply switching on and off a laser beam, it will be reflected off a rotating polygonal mirror and it’s possible to display dot matrix style text onto any surface. Read more »

Do you wish to have an X-Y Plotter, which it operates in two axes of motion (the ‘X’ and ‘Y’) by helping you to draw those continuous vector graphics? Since most of the standard plotters only has one control “Y” axis, this additional “X” axis will bring a big different.

Today, you will have the chance to create your very own X-Y plotter, but it does need a little bit modification by yourself. If you have limited budget, you can uses those components that were salvaged from any types of old scanners, but the amount must be in a pair.

Those components that needed for this project are:

• Belts
• Motors
• Driver boards
• Stepper motors

When you’re combined all the above components, it will give you a resolution of 16 micrometers per step, which is a whole lot better accuracy than what you expected here. Read more »

This mini DigiThermo is a device specially designed for measuring and time and temperature in chemistry laboratory.

The following picture demonstrates the circuit diagram of DigiThermo. Read more »

This temperature may look like several dozens thermostats that measure temperature and performs some action (switches relay) when temperature threshold is reached. Actually this is what this one does – it activates a relay with fan connected when temperature reaches 40ºC.

There is another thing what makes this device little bit different from others – it accepts TV remote control commands. By pressing 1, 2, 3 and 4 buttons each of four relays can be turned ON/OFF manually. Design is based on AT89C51 microcontroller which reads LM35 temperature sensor data via ADC0804 ADC. Compares temperature value to given threshold and in case of alarm it sends relay activation signal via ULN2003 Darlington transistor array chip. Grab project files, build and keep things cool.