In order to record flue temperatures, barn temperatures and humidities at several points and fuelwood consumption in conventional wood-fuelled flue-curing barns, a data logger was designed, built and used in Malawi. Design constraints were : no mains electricity supply available, data storage between data transfer intervals from the logger of two weeks or more, recording of 16 up to 64 different data channels, totally weatherproof and self contained, providing simple transducer signal conditioning and power supplies. Both digital and analogue sections of the logger use CMOS (complementary metal oxide semiconductor) type components to ensure minimum power consumption. When not actually sampling the central processor chip is shutdown to conserve power : a real time clock is used to awaken it. Data storage is in static RAM (random access memory) and transfer of data to a handheld portable computer is by bi-directional parallel interface which is also used to set the real time clock and sampling interval. A liquid crystal display is used to indicate status and could, at a later date, be used to provide barn management information.