Electronics

Programming the Sonoff with Tasmota using the Arduino IDE

  1. Make sure you configured the IDE as described in Prerequisite!
  2. Load the file sonoff.ino into the IDE.
  3. In the Arduino IDE for sonoff select from Tools Board Generic ESP8266 Module ( Tools Board Generic ESP8285 Module for CH4 version) and set the following options:
  • Upload Using: Serial
  • Flash Mode: DOUT
  • Flash Frequency: 40MHz
  • CPU Frequency: 80MHz
  • Flash Size: 1M (64K SPIFFS) ⚠️️**If Version 5.x.x -> Flash Size: “1M (no SPIFFS)”**⚠️️
  • Debug Port: Disabled
  • Debug Level: None
  • Reset Method: ck
  • Upload Speed: 115200
  • Port: Your COM port connected to sonoff
  1. Open user_config.h and configure your WiFi settings and optionally your MQTT, Syslog, WebServer, NTP, etc. settings
  2. Verify and/or compile the project and upload to your sonoff using the serial connection established above.

December 11, 2017 by Electronics ESP8266 0

Enabling 433Utils on the Rasberry Pi

First install wiringPI to access the GPIO headers on the PI.


git clone git://git.drogon.net/wiringPi && cd wiringPi &&./build

Confirm the wiringPI library is working by listing the GPIO pin allocation:

gpio -v
gpio readall

Should display something like: 

 +-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5v      |     |     |
 |   3 |   9 |   SCL.1 |   IN | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 0 | IN   | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | IN   | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |
 |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
 |   5 |  21 | GPIO.21 |   IN | 1 | 29 || 30 |   |      | 0v      |     |     |
 |   6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  |
 |  13 |  23 | GPIO.23 |   IN | 0 | 33 || 34 |   |      | 0v      |     |     |
 |  19 |  24 | GPIO.24 |   IN | 0 | 35 || 36 | 0 | IN   | GPIO.27 | 27  | 16  |
 |  26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  |
 |     |     |      0v |      |   | 39 || 40 | 0 | IN   | GPIO.29 | 29  | 21  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+

Next install the 433Util package:

git clone https://github.com/rotv/433Utils.git
cd 433Utils
git submodule init
git submodule update
cd RPi_utils
make

January 7, 2017 by Electronics Raspberry Pi 0

Connect and Program an ESP8266 With a Raspberry Pi

This small tutorial is meant to help you connect the ESP8266 wifi module to Raspberry Pi through the serial port. It will show you how to run a simple AT command and how to connect the chip to your wireless router using these commands.

Before starting the wiring, I highly recommend you to use a breadboard.

You can use the following table as a wiring guide.
Ex: VCC and CH_PD from Wifi module are connected to Pin 1 from Raspberry.

ESP8266 Raspberry Pi B
VCC and CH_PD Pin 1 (3V3)
GND Pin 9 (Ground)
TX Pin 10 (GPIO 15)
RX Pin 8 (GPIO 14)
esp8266_pinout_h-569x236 pinout2

After you finish the wiring you can plug in the power into Raspberry.

Now we’ve reached to the phase where we want to access the ESP8266 module through serial port. For this we need a tool called minicom, but first we need to disable Serial Port Login and some Bootup info on Raspberry. You can do that by following the next short steps

Disable serial port login:
Open /etc/inittab and search for the following line:

T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

You need to comment this line by adding # at the beginning of the line.

#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

Disable bootup info:

This part is optional. At every boot Raspberry will send all bootup information through serial port. If you want to keep that information to be sent, just skip this step.
Remove all ttyAMA0 references from /boot/cmdline.txt

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

After deletion, it should look like the following code:

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

Now we must reboot the Raspberry!

sudo shutdown -r now

The next step is to install minicom and connect to the wifi module. It will help us to communicate with the ESP8266 by offering us an interface where we can run the AT commands.

# Install minicon
sudo apt-get install minicom

# Connect to wifi module
minicom -b 115200 -o -D /dev/ttyAMA0

If everything went well you should see the minicom serial interface. Try to write AT+RST and hit Enter. If it will print some info it means that you are ready to go.

Connect to your home router

AT+CWJAP="dlink","password"

Where dlink is your router name (SSID) and password is the router password.

January 5, 2017 by Electronics ESP8266 Raspberry Pi 1