We collect and interpret live data from the same sensors used by the Datalog plugin. We've done this with an html script by hard-coding for a particular sensor. script 
http://found.ward.fed.wiki/assets/pages/check-the-weather/billboard.html HEIGHT 60
This time we separate this task into blocks and include options for what was once inflexible. Watch the hourglass flip as each step proceeds.
FROM found.ward.fed.wiki/esp8266-datalog SENSOR garage REPORT
We can combine these blocks with others that we have seen before. Here we wait for a click to get data from two more sensors. Click again to repeat the later steps.
FROM found.ward.fed.wiki/esp8266-datalog CLICK SENSOR desk REPORT SENSOR office REPORT
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Our block-based implementation takes more lines of javascript as we detect and check each option. We test this behavior with a sequence of Mechs with progressively fewer mistakes.
Nothing to report.
REPORT
No page to look for sensors.
SENSOR office REPORT
Wrong page to look for sensors.
FROM found.ward.fed.wiki/check-the-weather SENSOR office REPORT
No sensor name.
FROM found.ward.fed.wiki/esp8266-datalog SENSOR REPORT
No sensor by that name.
FROM found.ward.fed.wiki/esp8266-datalog SENSOR porch REPORT
Everything just right.
FROM found.ward.fed.wiki/esp8266-datalog SENSOR garage REPORT