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Tag: arduino

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Connecting arduino with an external programmer

In this quick tutorial we will see how to program our arduino board with the help of an external programmer and not by using the arduino bootloader.
Before proceeding with this tutorial take a look at the "burn arduino with usb tiny" tutorial.
The first thing you have to understand is that by uploading a program with an external programmer you are going to lose your already burned bootloader on your ATMEGA chip.
So before proceeding make sure you can bootload your chips using your external programmer.

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A-H-A-Project-RFID

In this tutorial we will see how we can connect a RDIF reader into arduino.
We are going to use a 125 Khz RFID module  that can be bought from seeedstudio.
Some 125 Khz tags are also needed. We bought them from ebay but you can also find them on other online shops.
This guide is the first of a series of articles.
Starting from this article we are going to construct from scratch a home alarm based on arduino duemillanove.
Since the project is big we are not going to see a lot of details of each part / sensor.
In the future we will try to cover the theoretical gap.
These series of tutorials will be easy to understand and will help you to construct step by step the "A-H-A" (Arduino Home Alarm) project.

...continue reading "Connecting 125Khz RFID module to arduino – Part 1"

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Published on 2 Comments on Weight sensors and arduino
Analog to digital converter

A sensor is usually an analog device. Analog devices are connected at the analog ports of arduino.
Arduino  with the use of AnalogRead function can read the analog sensor value from the specified analog pin.
The Arduino board contains a 6 channel 10-bit analog to digital converter. A 10 bit analog to digital converter as we have seen in the "Binary Decimal and Hexadecimal numeral systems" equals to a 210 – 1 = 102410  (0-1023 => 1024 steps).
If the resolution of arduino (1024 steps) does not cover your project you should use an external ADC converter with more that 10 bits.
For example you can connect the LTC2400 ADC which happens to be a 24 bit analog to digital converter.

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