A WiFi thermometer that sends data to Adafruit MQTT service, then can then be viewed via any MQTT app (I use MQTT Dash). The circuit is gets voltage supplied by a USB connection (can be a 5V cellphone power brick). https://fritzenlab.net/mini-usb-wifi-thermometer-with-esp32/
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USB/WiFi thermometer
clovisf/USB-Thermometer
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