alternatasha a site to catalog random projects

alternatasha
electronics
temperature sensor
temperature sensor

It’s winter time, and I need to monitor temperature throughout my place.  I had an extra Maxim DS18B20 “One-Wire” digital temperature sensor.  This can easily be read by any arduino-type microprocessor board.  I decided to use the Seeeduino Stalker for the task.  WIth its numerous digital pins, it made sense for me to hook up […]

wireless home sensor network, part I
wireless home sensor network, part I

Currently, home sensor networks, whether utilizing Xbee, Wifi, or other frequencies, are relatively expensive, unavailable, or simply unuseful. A low-quality security camera needs several other pieces in order to work properly, looks too industrial for a home, and carries a high price tag. Simple sensors, such as temperature and humidity loggers (such as the popular […]

D-cell battery capacity testing
D-cell battery capacity testing

Introduction Single-use D-cells bought in foreign countries were tested to get a rough idea of battery capacity (in mAH) in order to compare the overall value in purchasing disposable batteries as opposed to rechargeable ones. As battery capacity is a function of the C-rate at which the current is drawn, one type of circuit for […]