WiFi Module SCF-12F

We chose to use a WiFi hardware already widely employed on the market (the ESP-12E) 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-12E.

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-12E module

RST External reset signal, active low MOSI * MOSI for SPI interface
ADC *
10-bit ADC Analog Input 0-1V SCLK * Serial Clock for SPI interface
CHIP-EN Chip Enable, active high GND Power Ground
GPIO16 General Purpose I/O GPIO15 General Purpose I/O
GPIO12 General Purpose I/O GPIO2 General Purpose I/O (connected to the LED)
GPIO13 General Purpose I/O GPIO0 General Purpose I/O
VCC +3.3V power input GPIO4 General Purpose I/O
CS0 *
Chip Select for SPI interface GPIO5 General Purpose I/O
MISO *
MISO for SPI interface RX UART RX
GPIO9
General Purpose I/O (only on 12-D version) TX UART TX
GPIO10 General Purpose I/O (only on 12-D version)

* Not managed from miuPanel firmware.

Leds Module

Blue LED
(GPIO2)  Connected to GPIO2

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 and GPIO15:

Firmware RUN mode

GPIO0 = ‘1’
GPIO2 = ‘1’
GPIO15 = ‘0’
TX = ‘1’
Important: make sure your micro-controller keeps the TX line high during the module boot

 

Programming Mode

GPIO0 = ‘0’
GPIO2 = ‘1’
GPIO15 = ‘0’
(*) 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.