How to
implement your own firmware on the Itead 4 Channel
ESP8285 based Relay board ( 7V to 32V-4 Jog Switch)
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Since I found no how to in the internet how to flash
an own firmware into this nice and cheap Itead device
I decided to wrote one. There are some specials to notice:
- This
module is based on the ESP8285 (NOT ESP8266 – Take care when selecting board in
Arduino ide)
- There
are no plugs where you can easily attach your FTDI programmer. You will have to
connect directly to the PSF-B85 board that holds the esp. (For more information
about this board please refer to https://www.itead.cc/wiki/PSF-B85
- Please
note that the show pin reference is meant as a view from below the board which
is some kind of confusing. So please follow the following picture how to
connect your ftdi.
- This
how to does not include how to use the Arduino IDE and how to use a FTDI
programmer. Please google this. There is much documentation.
- Actually
it can be ordered at bang good. Here: http://www.banggood.com/SONOFF-USB-5V-Or-DC-7V-32V-DIY-4-Channel-Jog-Inching-Self-locking-WIFI-Wireless-Smart-Home-Switch-p-1157460.html
Flash firmware
- At
first you will have to connect you FTDI programmer directly to the board. The
following picture shows how to connect the 4 FTDI cables:
- You
will only need to connect GND, VCC, RX, TX and GPIO 0. Please keep in mind that you have to crossover RX and TX. So connect RX to TX and TX to RF. You can skip GPIO 15 and
GPIO 2
- To
get the ESP into bootloader mode you have to connect GPIO0 to GND and the power
up the device. Afterwards you can download the firmware with Arduino IDE or ESP
tool. Afterwards you have to disconnect GPIO0 to let the device start firmware
instead of bootloader
Using the
board peripherals
- Relay
1-4 is connected to PIN 12, 5, 4, 15 (example for relay 1 in Arduino sketch
use: pinMode(12, OUTPUT); digitalWrite(12, LOW);)
- The
LED is connected to PIN 13 (example
for relay 1 in Arduino sketch use: pinMode(13, OUTPUT); digitalWrite(13, LOW);)
- The
button right next to the led is connected to PIN 14 (example for relay 1 in Arduino sketch use: pinMode(14,
INPUT); int
value = digitalRead(14);)
- The
second button cannot be accessed directly
Hints
- This
PCBA comes with some kind of mode switch that can be selected with button2 (the
one right next to the micro usb connector). If your
relay does not react to your commands press this button to change the mode and
afterwards do not change it again.
- This
PCBA need more current than most of the usb ports or
FTDI programmers can offer. Therefore you might have to additionally connect
the USB power supply.
Questions can be send to
info@haus-bus.de