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uer166 opened this issue Dec 28, 2018 · 0 comments
Open

Delay after mux setup not long enough for stable measurement #4

uer166 opened this issue Dec 28, 2018 · 0 comments

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@uer166
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uer166 commented Dec 28, 2018

MAX31855_lib/MAX31855.cpp

Line 191 in 3e351d1

delay(100);

Example temp readings on channel 7 with 100ms, note random spikes:
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 46.50, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 415.50, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 260.25, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,

Example temp readings on channel 7 with 120ms, no random spikes:
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.50, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
??, ??, ??, ??, ??, ??, 22.75, ??,
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