- #1
hackhard
- 183
- 15
graphite has high conductivity , so i though of making a touch button out of a pencil drawn pattern on the wall.the pattern is shown below.
when not touched -resistance between ends of the pattern >200Mohm (exceeds dmm limit)
when fully pressed - resistance between ends of the pattern = 1.3 Mohm.
but Vout rises after delay or falls after delay of some 100 ms.due to high impedance
this pattern connects skin resistances in parallel
can someone suggest a better pattern ( of lower end to end resistance) ?
for faster response
when not touched -resistance between ends of the pattern >200Mohm (exceeds dmm limit)
when fully pressed - resistance between ends of the pattern = 1.3 Mohm.
but Vout rises after delay or falls after delay of some 100 ms.due to high impedance
this pattern connects skin resistances in parallel
can someone suggest a better pattern ( of lower end to end resistance) ?
for faster response
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