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This USB to TTL Serial board based on the CP2102 chip, it have no enough current (400mA+) to driven ESP8266. So I will fix the issue.

CP2102 Datasheet: https://www.sparkfun.com/datasheets/IC/cp2102.pdf

UPDATE: I made a new CP2102 USB to TTL converter depend on the board. It's now on tindie.

Step 1: Materials

  • 1 x CP2102 USB adapter, it's easy be found at eBay by keyword cp2102
  • 1 x AMS1117-3.3
  • A knife
  • A soldering iron

Step 2: Cutting Off the Original 3.3V Output

The 3.3V from CP2102 has only 200mA output. It's not enough for esp8266. I cutting off the 3.3V output with an knife.

Step 3: Soldering LDO AMS1117-3.3

Use the pin 5V as input of AMS1117, connect the output to 3.3V

Now the USB adapter can driven esp8266 directly.

<p>Hi!<br>Will it work on PL2303HX chip as well?</p>
<p>I'm using old Profilic PL2303 USB2TTL adapter with dual 3.3V and 5V outputs.<br> On 3.3V pin flashing ESP without external power is ok ;) Tested with ESP-01, ESP-12E, ESP-14 and LUA MCU Dev Board V3.</p><p>If you have only 5V output, so this mod can work. BR</p>
<p>Interesting...<br>I didn't know I can draw enough current from the chip on 3.3v<br>I'll try.<br>Thanks!</p>
<p>did you find the ans ??</p>
<p>No :(</p>
<p>did you find the ans ??</p>
<p>did you find the ans ??</p>
<p>did you find the ans ??</p>
<p>Hmmm aren&acute;t the TR/RX wires from the CP2102 5V too?</p><p>So they are able to destroy the ESP aren&acute;t they?</p>
<p>Can I use cp2102 to convert TTL to USB?</p>
Yes.
<p>I am using ESP8266 with CP2102. For ESP8266 supply I am using LD33v connected to VCC and CH_PD. as soon as serial monitor is open it shows continuous garbage value which is never ending. How to solve this issue?</p>
<p>Is the VCC 5V output from USB port?</p>
<p>Hi yanc, For ESP supply I used LD33v output which is 3.3 v and can handle 1A current. </p>
You can found the driver here https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx
Hello, please search ebay for cp2102, you will find a lots of board like the image.
<p>Really great Project ! Two questions: I have a hard time finding the same board on ebay, that is: 3.3v, 5 pins, CP2102. Any hints where to get it?</p><p>Also, what about CP2102 Windows 7 driver - can you recommend best source?</p><p>Thanks Paul</p>

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