Wemos D1 mini

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  • ESP chip version: ESP-8266EX (ESP12F?)
  • Flash size: 4M
  • Onboard USB-TTL converter: yes: CH340G USB to UART driver
  • GPIO's broken out/available to free use: see here
  • GPIO tied to onboard hardware (like relay, button, LED on a standard sonoff)
  • Power supply information: ??
  • Antenna: onboard PCB antenna