Abstract
This work reports the simple and versatile biological data acquisition interface. The small iWorx 214 data recorder as the component of advanced animal/human physiology teaching kits (AHK 214, CB Sciences) has two optically isolated differential input ports, 2 single-ended inputs, 4ch 16 bits ADC, 2ch 12 bits DAC and USB communication port. Interactive software (LabScibe, CB Sciences) runs for signal acquisition and data analysis on the host computer. This teaching kit shows very high cost performance, but the source program ( LabScribe ) is not opened for user to improve the program. To prepare the interface with the low cost, the simple and versatile analog data acquisition interface embedded with microprocessor (H8/3069) was developed. This system are composed with microprocessor board (AKI-H8/3069,Akizuki Denshi Tsusho), 4ch differential amplifiers, rechargeable dry batteries, RS-232C serial communication port and host computer, and has utilized the hardware functions such as 4ch 10 bits ADC, 2ch 8 bits DAC and serial communication device in the microprocessor chip. The source programs are written in assembly language and C under the system development tools supplied as free distribution from maker including assembler, compiler, debugger, operating system and so on. The technical information about the design and development of the interface system are now available from many books, web sites and papers. The source programs and circuit diagram of this interface system are opened. [Jpn J Physiol 55 Suppl:S239 (2005)]
