Abstract
A stand-alone data logger was developed for biological exposure experiment in space. A combibnation of one chip micro computer with electrically erasable programabble read only memory, real timer counter and analog awitch enables measurement of temperature every 10 minutes (default) for a period of one year at electric power supplied from lithium primary battery. It can be operated under thermal swing between - 80 and +80 degree C, expected during expoosure on outer environemnt of the International Space Station or biological orbiting satellites. Physical size and mass of the prototype logger are 46 x 35 x 14 mm and 24g (not including potting material coated over the circuit board nor a pressurized container for the logger).
