I've just PID'd my Gaggia Classic.
I would like to take the input/output of the PID and record it on a laptop, i.e. I want to record the voltage off the thermocouple (which software can convert to temperature), and simultaneously record the voltage on the output pins that go to the SSR.
The thermocouple voltage is a few mV (max 4 for the sorts of temps we're talking about), and the output pins are about 9 volts and 60mA. The output to the SSR is really just an on/off signal.
I am looking for a cheap DIY way to acquire this data and plot it in excel. I've done a little reading and seen some people use microphone jacks.
Has anyone done something similar? I do not want to splash out on a proper data acquisition sysyem which runs to hundreds of dollars.
I would like to take the input/output of the PID and record it on a laptop, i.e. I want to record the voltage off the thermocouple (which software can convert to temperature), and simultaneously record the voltage on the output pins that go to the SSR.
The thermocouple voltage is a few mV (max 4 for the sorts of temps we're talking about), and the output pins are about 9 volts and 60mA. The output to the SSR is really just an on/off signal.
I am looking for a cheap DIY way to acquire this data and plot it in excel. I've done a little reading and seen some people use microphone jacks.
Has anyone done something similar? I do not want to splash out on a proper data acquisition sysyem which runs to hundreds of dollars.


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