Logging System & Data Acquisition

This microcontroller project log the temperature system. It can be used to monitoring and controlling environment temperature as we needed. i know that the chip, AT89C51, little out of date, but at least we can still learn the system How to make Data Acquisition & Logging System with microcontroller. This great project made by Abbas Raza.

"The status and temperature date saved to PC via serial communication. Here 8 temperature sensors are connected(4 shown in diagram for simplicity). values of all the sensors are sent serially by AT89C51 to pc. Software "DAQ System " takes these values and show them on its front panel, and also logs them to the data base "daq.mdb" .we can set some parameters like set point , low limit ,and high limit . when temperature of some sensor increases beyond set point ,the heater connected to controller (specific for that sensor) will be turned OFF( ON in opposite case ).High limit and low limits are for alarm. when temperature goes above high limit or below low limit the alarm will be turned on."

For complete reference, source code, Schematic, you can download here.
[Link]

AVR Frequency Counter

Do you need an avr counter that can measure for 40Mhz and low cost for this project? Well take a look at microcontroller project : avr counter created by Murray GreenMan. This microcontroller project also give you some interesting feature like : 8 digit LCD display and there is an optioanal PC telemetry so you can watch the output on a PC.

"The counter contains only three inexpensive ICs (well, add a regulator and three transistors), and operates from 6 - 15V DC at about 25mA. The most expensive single item is the LCD display, which is an industry standard 16 x 2 dot matrix module, which can often be found used or at bargain prices. This isn't a kitset, but the parts are easily obtained, and the circuit can be built using any prototyping technique, or you could design your own PCB. The prototype was built on a small commercial strip board."
[Link]

How to Root login on Ubuntu 10.04

Ubuntu root access was blocked by default  for GUI.  For Enabling This you need to reset password for root.

once password for root is reset. You can login root on GUI using Other.. option available on Login Screen

Use the following command to Reset root password

$ sudo passwd root   

 

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