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11. |
An electronic spirit level |
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Environmental Entomology,
Volume 1990,
Issue 1,
1990,
Page 26-26
CharlesNewhouse,
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PDF (224KB)
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摘要:
The aim The purpose of the project was to build a spirit level which has two advantages over the conventional, simple, bubbletype device:(a) The user should not have to be above, or even necessarily close to, the level to be able to read it. Indeed it should be possible to have an entirely remote readout.(b) The device should tell the user not only whether a surface is level, but also by precisely how many degrees it is out of level.
ISSN:0046-225X
DOI:10.1049/ee.1990.0011
出版商:IEE
年代:1990
数据来源: IET
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12. |
Thermometer for the blind |
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Environmental Entomology,
Volume 1990,
Issue 1,
1990,
Page 27-28
N.Bradshaw,
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PDF (330KB)
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摘要:
Sometimes you might find it difficult to see the thread on a mercury-glass thermometer. How much more difficult it would be to read if you had poor sight or were even blind. As a project for a oneyear AS course in electronics, I set myself the task of building a thermometer which would work independently of sight.
ISSN:0046-225X
DOI:10.1049/ee.1990.0012
出版商:IEE
年代:1990
数据来源: IET
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13. |
Optical fibres |
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Environmental Entomology,
Volume 1990,
Issue 1,
1990,
Page 29-30
J.F.B.Hawkes,
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PDF (417KB)
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摘要:
Optical fibres are currently finding uses in a great many diverse areas such as communications, lighting, imaging and optical sensors. Basically they provide a means of carrying light between two points via a flexible secure medium. The purpose of this article is to explain how they operate, to show how they fit in with some of the applications mentioned above and finally to describe some simple circuitry and equipment which may be used to investigate the properties of fibres and which could be made the basis of more advanced projects.
ISSN:0046-225X
DOI:10.1049/ee.1990.0013
出版商:IEE
年代:1990
数据来源: IET
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14. |
Yet another port interface for the BBC computer |
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Environmental Entomology,
Volume 1990,
Issue 1,
1990,
Page 31-32
D.Noble,
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PDF (437KB)
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摘要:
BBC microcomputers can be used for the collection of data from sensing devices such as thermometers and for the control of processes, motion displays etc. Sensors can be used as simple switches as for example lightoperated switches, when the digital inputs of the user port would be appropriate. For situations in which measurements are to be made and perhaps decisions are determined by these measurements, as in temperature sensing for control, the analogue port may be used.
ISSN:0046-225X
DOI:10.1049/ee.1990.0014
出版商:IEE
年代:1990
数据来源: IET
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15. |
Museum of the Moving Image |
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Environmental Entomology,
Volume 1990,
Issue 1,
1990,
Page 33-37
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PDF (1023KB)
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ISSN:0046-225X
DOI:10.1049/ee.1990.0015
出版商:IEE
年代:1990
数据来源: IET
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