ESP8266 Community Forum

EDIT: please check the ESP8266 Github Wiki for reference: https://github.com/esp8266/esp8266-wiki ... e_versions

From this this Taobao shop, here are the different ESP8266-based module pinouts and physical dimensions (and almost layout too ):

ESP-01
The most common module with printed PCB antenna:

• 2x4 2.54 mm pitch header
• built-in PCB-printed antenna
• 3 GPIOs: GPOI0/2/16
• UART URXD/UTXD
• RESET and CH_PD (powerdown)
• VCC/GND
• 14.2 mm W x 14.2 mm L

ESP-02
A less common module with antenna connector, that may be compatible with breadboards:

• Dual 1x4 2.54 mm pitch header in DIP form factor
• built-in U-FL connector for external antenna
• 2 GPIOs: GPOI0/2
• UART URXD/UTXD
• RESET and CH_PD (powerdown)
• VCC/GND
• 14.7 mm W x 14.2 mm L

ESP-03
A SMT (Sufrace Mount Technology) module with all pins broken out to castellated pads with built-in ceramic antenna:

• Dual 1x7 2 mm pitch castellated pads
• built-in ceramic antenna
• 7 GPIOs: GPOI0/2/12/13/14/15/18
• UART URXD/UTXD
• RESET and CH_PD (powerdown)
• VCC/GND
• 12.2 mm W x 17.4 mm L

ESP-04
Another SMT (Sufrace Mount Technology) module with all pins broken out to castellated pads without built-in antenna:

• Dual 1x7 2 mm pitch castellated pads
• external antenna on pad
• 7 GPIOs: GPOI0/2/12/13/14/15/18
• UART URXD/UTXD
• RESET and CH_PD (powerdown)
• VCC/GND
• 12.0 mm W x 15.0 mm L

ESP-05
A simple UART-only module with antenna connector:

• Single 1x4 2.54 mm pitch header
• built-in U-FL connector for external antenna
*]No GPIO
• UART URXD/UTXD
• No RESET nor CH_PD (powerdown)
• VCC/GND
• 14.2 mm W x 14.2 mm L

You should describe them better, not everyone will pickup that say -03 have onboard proper antenna and others have UFL etc....

Maybe edit your post and add these factors

Richard.

Since none of these modules have CE/FCC/RoHS there is little point in using them for anything other than prototyping. So my vote is for bare chips.

Some how your post went in twice. I delete one of them....

I am with you I like FCC, however, Asian modules for RF devices are 99% of the time NEVER FCC'd, if this module ever is, it will not be $5 anymore. And if they say FCC they are not, I have checked many times and only once in at least 10-20 checks they were.

But I hear ya!

Richard.