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Clarification of voltage requirements on each chip #1

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Clarification of voltage requirements on each chip #1

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Clarification of voltage requirements on each chip
dotcomstar Aug 30, 2019
6266d97
Update README.md
nperkin3 Jan 31, 2020
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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -16,6 +16,8 @@ With a dedicated USB converter, the ESP8266 can be plugged in directly to the pr

For a generic USB-to-TTL converter, the ESP8266 can be wired for progamming with a level shifter (or using voltage dividers if a level shifter is not available). **The ESP8266 has an operating voltage of 3.3 V and is NOT 5 V tolerant.** For programing, connect VCC and enable to power, RX and TX to their appropriate inputs, and GND and GPIO0 to ground.

Note: The [ESP8266](https://user-images.githubusercontent.com/32310882/64036322-e7ceea00-cb20-11e9-8db5-5e38aa3ca02b.png) is the small black chip in the wifi module. The larger [blue chip](https://user-images.githubusercontent.com/32310882/64036213-a6d6d580-cb20-11e9-873c-5798a7c38486.png) converts the voltage from 5 V down to 3.3 V, enabling the blue chip's pins to be plugged into a 5 V source.

### Uploading Code

Open the sketch from this repository in Arduino IDE. Set the board type by selecting **Tools > Board > Generic ESP8266 Module**. Set the flash mode by selecting **Tools > Flash Mode > DIO**. Set the memory size by selecting **Tools > Flash Size > 1M (no SPIFFs)**. Set the appropriate port and click upload.
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