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Figure 8: ESP8266EX as used in Smart Light Demo!
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1. Input voltage of 5V for RGB triple color light and other circuits.
2. 5V DC-DC power chip converts to 3.3V.
3. 3w RGB triple color light.
4. GND RXD TXD connector: connect USB to TTL serial cable to download, print log.
5. External metal antenna.
6. GPIO0 connector. With jumper cap: low; otherwise: high. For switching between
UART Download and Flash Boot mode.
7. Three PWM outputs.
8. Infrared receiver transistor.
9. Reset button: Press 5s to complete reset."