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Check out this cool PIC Microcontroller Touch Keypad by Mondo Technology. I love the simplicity of button press detection. There are lots of industrial buttons that do this exact thing but they are very costly. The actual data from the touch sensors is quite erratic and requires some software processing. Basically you create a pulse for each of the ports and read the data with the instruction following the pulse signlal rise. Then read the ports the same way looking for a gap of 0.1 seconds with no data detected. This does the ‘debounce’. This results in fairly clean data capture from the sensors.” |
September 28th, 2007
[…] via 4×4, Circuits, computer, data capture, gap, keypads, projects, touch sensors4×4, Circuits, computer, data capture, gap, keypads, projects, touch sensors var dc_UnitID = 14; var dc_PublisherID = 13853; var dc_AdLinkColor = ‘blue’; var dc_adprod=’ADL’; […]
September 29th, 2007
Cool idea but the chopper will be dirty after so much touching. And what if you are loaded with static electricity? The pic will die.
September 29th, 2007
Some 5.1 Volt zeners could prevent the static shock death. I would be interested to see what an industrial circuit looks like.
September 29th, 2007
Well i think in indurtries they use piezo keypad or a special thing which is a 3 layered stuff: between two layer there are microswitches.
October 3rd, 2007
I’ll have to make one of those in the near future!