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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
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An ESP8266 alone is all you need to manage a temperature sensor. The ESP12 flavor is much better to connect peripherals. This board is less than 5$.
It can manage a one wire, I²C or SPI temperature sensor and send the information to a base station. You can even add a small OLED screen if you want to display the temperature locally.
You only need the pico at the base station.