WiFi Module SCF-01

We chose to use a WiFi hardware already widely employed on the market (the ESP-01) on which we uploaded our innovative µPanel firmware. To highlight the fact the module firmware has been completely changed with respect to other commercial products, we chose to name it SCF-01.

This WiFi module appears like in the following picture:


SCF-01 Wi-Fi Module (version derived from the ESP-01 module)

All the functions of the WiFi Module are managed by the powerful system on chip (SoC) ESP8266, that combines a 32 bit micro-controller (and many peripherals, such as GPIO, I2C, ADC, SPI, PWM) with a WiFi radio. 

Pins of the SCF-01 module 

GND Ground
TX UART Transmit pin
GPIO2 General Purpose I/O
CHIP_EN Chip Enable, active high
GPIO0 General Purpose I/O
RST External reset signal, active low
RX UART Receive pin
VDD +3.3V power input


The module mounts also two LEDs:

LED Red   
Connected to VCC, steady on when power is applied
LED Blue (TXD) UART TX indicator, tied in hardware to U0TXD


Operating mode

After power-up (or reset) the module can boot in two different modes, depending on the logic levels applied on pins GPIO0 and GPIO2: 

1. Firmware RUN mode:

  • GPIO0 = '1'
  • GPIO2 = '1'
  • TX = '1' (Important: make sure your micro-controller keeps the TX line high during the module boot

2. Programming Mode 

  • GPIO0 = '0'
  • GPIO2 = '1'

IMPORTANT: to correctly update the module's µPanel firmware, do NOT use this solution, otherwise you will lose definitely the µPanel firmware! The correct way is launch the update request from µPanel APP, from the module configuration menu.      


Electrical specification

This module requires 3.3 V on VCC and 3.3 V for the logic. It does NOT tolerate 5 V!
If you use Arduino UNO, and you connect to the Wi-Fi module the RX and TX pins of Arduino, you will destroy the module.

Moreover, the 3.3 V source of Arduino Uno has inadequate current capability to power this module. You should use a separate 3.3 V source to power the module, with a current capability of 300 mA or higher, because the average current consumption of the Wi-Fi module is about 140 mA. 

To simplify the connection of the our Wi-Fi module with a 5 V board (like Arduino), we designed the ADP-01 Breadboard adapter.