Wireless Tag ESP32-C2 ESP-12 Compatible Module (WT018684-S5)
Wireless Tag ESP32-C2 ESP-12 Compatible

Available from:


GPIO #Component
GPIO00 User
GPIO01 User
GPIO02 User
GPIO03 User
GPIO04 User
GPIO05 User
GPIO06 User
GPIO07 User
GPIO08 User
GPIO09 User
GPIO10 User
GPIO11 None
GPIO12 None
GPIO13 None
GPIO14 None
GPIO15 None
GPIO16 None
GPIO17 None
GPIO18 User
GPIO19 User
GPIO20 User
Configuration for ESP32-C2
This module can replace modules such as: BT3L, CB3S, CB3L, CR3L, C-8138, ESP-12, FL_M93_V1, MRE3S, MWA04, MWA6S, T103, TYWE3L, TYWE3S, XR3, WB3, WB3L, WB3N, WB3R, WB3S, WB8, WR3, WR3E, WR3L, WR3N, ZS3L

To flash an ESP32-C2 device you need to compile your own binary using tasmota32c2-arduino30 environment.

Read my guide on replacing a compatible module.

There are two different versions of this module:

  • WT018684-S5-N4 with 4Mb flash
  • WT018684-S5-N2 with 2Mb flash is not recommended for Tasmota due to low flash space.
  • WT018684-S5-N1 with 1Mb flash cannot run Tasmota due to insufficient flash space.


You can purchase (AliExpress, Amazon, Banggood) a test board for effortless flashing.

Test Board


For normal operation connect EN to VCC (pull high) to enable the chip. GPIO9 has an internal pullup and it needs to be high on power up for the module to boot so try and avoid that pin similar to GPIO0 on ESP8266.

ESP32’s are power hungry on boot and the USB to serial adapter might not be able to provide enough power for that. Use a stable 3.3v power supply that can supply more than 500 mA.