Here are some useful articles on electronics and microcontrollers.
Digital I/O expansion methods.
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"Arduino Software Guide"
Essential Guide to the DHT22 and DHT11 humidity sensor for an Arduino uno R3. Is it feeling sticky or dry - you can only work this out using the dew point...
Alkaline battery charger : How to make a simple dry cell alkaline battery charger circuit
Chemical concentration controller : How to detect and control chemical concentration in a solution using an electronic circuit.
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