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I guess it would be harder to power an USB WiFi adapter. And it's not going to be cheaper than ESP2866.

• Tepix 11y ago
  Actually a 802.11n USB adapter costs $1.55, that's cheaper than a ESP8266.
  • aswanson 11y ago
    Wow. Can you provide a link to that?
  • sklogic 11y ago
    The cheapest I could find was around £2.50. I could never run one with RPi without a powered USB hub, so add at least £5 more.