Projekt IoT

IoT - Internet of Things

some project ideas and notes regarding Arduino, ESP8266, ESP32 and other micro controllers

• Arduino Nano with 433 MHz data transfer
• ESP-01 for shutter control
• ESP-12 for LED switch
• ESP-12 for laundry room air control
• SonOff with own firmware and tasmota devices

 https://github.com/arendst/Sonoff-Tasmota/wiki

Arduino IDE Inofficial Boards

look here for an overview:

• https://playground.arduino.cc/Main/ArduinoOnOtherAtmelChips

ATTiny

Most ATTinys: https://github.com/SpenceKonde/ATTinyCore

• Datasheet 2313: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2543-AVR-ATtiny2313_Datasheet.pdf
• Datasheet 2313 Summary: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2543-AVR-ATtiny2313_Summary.pdf
• Pinout 2313: https://github.com/SpenceKonde/ATTinyCore/blob/master/avr/extras/Pinout_x313.jpg

Wiring

https://startingelectronics.org/tutorials/AVR-8-microcontrollers/ATtiny2313-tutorial/P8-TC0-polled-timer/ATTINY2313-TC0-polled.png

• Vcc can also be 3.3V
• C1 can have bigger capacity for unstable voltage
• R1 can be higher values

Programmer

I have an USBasp. Program with avrdude. Works integrated in Arduino IDE. Ignore warning "avrdude: warning: cannot set sck period. please check for usbasp firmware update.".

Numbering of Connector is

1 3 5 7 9
2 4 6 8 10

Need to connect Vcc, Gnd, Miso(1), Mosi, Reset and Sck

New chip needed 0.5MHz for correct timing with delay()

Needed to add this udev rule

echo 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05dc", GROUP="dialout", MODE="0660"' | sudo sh -c 'cat >/etc/udev/rules.d/50-USBasp.rules'

ESP8266

https://github.com/esp8266/Arduino

Domoticz

This is a home automation system that is natively supported by tasmota devices via mqtt

Installation

• Add repos https://software.opensuse.org/download.html?project=home%3AGuillaume_G&package=domoticz
• Install package domoticz
• Create system user

sudo /usr/sbin/useradd -U -g domoticz -m -r domoticz

• Edit section Service in /usr/lib/systemd/system/domoticz.service (ports, logging, db)

[Service]
ExecStart=/opt/domoticz/domoticz -notimestamps -syslog -www 8888 -sslwww 4343 -dbase domoticz.db
WorkingDirectory=/home/domoticz
User=domoticz
Group=domoticz
Restart=always

• Activate new service file, start domoticz and check status

sudo systemctl daemon-reload
sudo systemctl enable domoticz
sudo systemctl start domoticz
sudo systemctl status domoticz

Configuration

https://github.com/arendst/Sonoff-Tasmota/wiki/Domoticz

• On setup/hardware page create mqtt connection (host job4, port 1883, option flat/out) and one Dummy device for virtual switches
• For each tasmota device function (switch, temp/hum, ...) click on "virtual sensor" (on hardware page at dummy device entry)
• On setup/devices page look at idx values for the virtual sensor devices and configure tasmota device with them.