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.

Cura Build

Prerequisites

git clone https://github.com/Ultimaker/Cura.git
git clone https://github.com/Ultimaker/cura-build

Follow instructions for CentOS in cura-build/README.md and try to adapt for opensuse 42.2

sudo zypper in gcc-fortran python3 python3-pyserial python3-numpy python3-opengl python3-setuptools libstdc++-devel openssl openblas-devel gtk3-devel webkit2gtk3-devel gstreamer-devel python-wxWidgets-3_0 python-wxWidgets-3_0-devel
# pip3 install F2PY

F2PY not found -> build may fail

Installation

cmake fails because it needs python 3.5 while opensuse 42.2 only has 3.4 - end of story for now :(

Use app container for now (but how to use core functions directly?)

Feinstaubsensor

https://luftdaten.info/feinstaubsensor-bauen/

• NodeMCU
• SDS011
• optional: BME280 (probably needs code change since they use DHT22)
• USB powersupply
• USB cable
• 2 x Marley HT DN75, 87°
• Gaze als Insektenschutz
• 3 x Kabelbinder lang (für Gaze an Marley, Fixierung an Pfosten o.ä.) und kurz (Kabel/NodeMCU/SDS011/BME280) fixieren
• ~20cm Plastikröhrchen Innendurchmesser 6mm (dunkel)

Cost ~25€

RFID

What is needed for an access control demo (might send mqtt status):

• ESP8266 as central unit
• RFID reader/writer
• 1 RFID Card (Master)
• n RFID Tags (ID "Cards")
• USB Cable MicroUSB
• LED for Master Mode: yellow on
• LED for access granted or programmed ok: green
• LED for access denied or removed: red
• Dupont cabling for reader (~10 f-f)
• Breadboard

Cost ~5€