Particle Photon + IFTTT

I will work with particle photon an a temperature sensor and I will be sending the temperature data to ThingSpeak through a webhook method., but Does anybody know how to trigger IFTTT when the room temperature reach its limit of 77F? (any example code?)

I recommend that you take up the measurement data with this project: it shows the construction and the cabling. The service of IFTTT can then be used to check a variable (in your case, the ascertained Fahrenheit value and signaling).
For this a so-called applet is created: the selection options you find under the selection ‘Particle’.