File:Keypad3.png
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Summary
| Description |
English: Tri-state multiplexing can be used to increase the number of keys detectable for a fixed number of inputs. With x/y multiplexing, 8 inputs can be used to detect 16 keys. However, 28 keys can be detected if tri-state multiplexing is used. If, in addition, a diode is used in series with each key, 8 I/O lines can be used to detect 56 keys. A complete 110 key computer keyboard can be implemented with just 11 I/O lines.
Without diodes, tri-state multiplexing allows (n-1)(n/2) keys to be detected with n inputs. |
| Date | |
| Source | Own work |
| Author | Ron Binstead |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:38, 21 July 2023 | | 1,200 × 600 (108 KB) | Touchscreen1 | Uploaded own work with UploadWizard |
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