摘要:

‘Microelectronics For All’ (or MFA) was developed to introduce systems thinking to 11 –14 year olds. Some 40% of UK secondary schools have purchased MFA since its introduction in 1984. The basic concepts introduced by MFA relate to sensing (with input sensors), acting (with output devices), making ‘decisions’ (with gates), counting, pulsing and using a small memory to control a ‘music module’ and a Lego buggy.

DOI:10.1049/esn.1989.0040

出版商:IEE    

年代:1989

数据来源: IET

摘要:

This article gives a description of the design, construction and performance of a home-built pH meter comprising pH electrode, signal-conditioning system and BBC Microcomputer. Unlike conventional meters, its hardware is kept very simple. Most of the signal conditioning is achieved by software; the hardware part consists of two elements only, a stable voltage reference and a very-highimpedance voltage follower.

DOI:10.1049/esn.1989.0041

出版商:IEE    

年代:1989

数据来源: IET

DOI:10.1049/esn.1989.0042

出版商:IEE    

年代:1989

数据来源: IET

DOI:10.1049/esn.1989.0047

出版商:IEE    

年代:1989

数据来源: IET

DOI:10.1049/esn.1989.0049

出版商:IEE    

年代:1989

数据来源: IET