Need direction on starting project - Photon+Photointrupter

[ScruffR]

As posted above

@ScruffR

Some good read about the formatting syntax can be found here too
http://www.cplusplus.com/reference/cstdio/printf/

And also here, where you already were - as a direct response to a post of yours

Spark Core and Node-RED integration

The format() function can’t deal with String objects, which get returned by functions like Time.timeStr() so you need to convert them into a C string by use of the class method String::c.str(). And in printf format strings the placeholder for a C string is "%s". So a properly formatted publish would look like this Particle.publish("TempSensor1", String::format("Temp=%dF; Humidity=%d%%; Time=%s", temp_f, humidity, Time.timeStr().c_str())); This might be some interesting read for you, if you w…