generic pause/wait?

@d0773d, np - it explains all well in your world... and over time I may know enough about it to come up with some abstraction of the real world into a model expressed in algorithms and data structures.

How would I update the cmd to the newly taken temperature value?

This - taken from a previous post - means, that temperature and ph sensors are paired. For each pair, you read a temperature first, then you ask the ph sensor to calculate the temperature compensated ph value, and then you read it, then you display it and/or send it to some place.