ESP8266 IR Blaster

I’m getting sick of fixing my TV remotes. Universal remotes are all over priced monsters. So instead I thought I’d wack together an IR blaster from the spare parts draw.

Meme of a man spraying a dog with water, but used as a metaphor for spraying a TV with infrared signals

The goal here

I thought it would be easy, infrared remotes use decades old technology. I wanted to use an ESP8266 I had laying around for its WiFi. Surely its a popular project with millions of guides and examples to work off?

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Corsair’s Temperature Sensors

Wasting nothing, I wanted to use the lil’ temperture sensors that my obsolete Corsair fan controller game with

Corsair Temperature Sensor

Such a cutie

Somehow it took me way too long to determine that they are 25k NTC Thermistors. Mainly because many fancy thermistor libraries for arduino out there support a huge list of types, with no indication of what is the most popular.

After this feat of detective work, I can basically hand the rest of this post to adafruit’s fantastic guide on how to use it surprisingly accurately with an actual algorithm to get a temperature in Celsius. For hardware, chuck in in series with a normal resistor to create a voltage divider, and use the analog pins to take measurements at the midpoint.

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