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