IRBazooka

This is the initial repository for our IoT Study Group.

The aim of this project is to create an automated way of turning off all the AC units in the office at some specified time, with the intention of reducing our energy consumption. Alexa integration is also on the roadmap, in order to control the AC units with only our voice power.

Instructions

$ git clone --recursive https://github.com/IotStudyGroup/IRBazooka.git

Folder structure

• Eagle
  • PCB files.
• Led-holder
  • 3D Printed files for the LED holder. You don't actually need it. But it makes it easier to position the LEDs.
• NodeMCU
  • Firmware (WORKING IN PROGRESS - NOT USABLE YET)
• OpenMQTTGateway (git submodule)
  • open firmware that works great!

Bill Of Materials

These are the components necessary to build the board

Qty   Value            Description

 2    10kΩ             10kΩ resistor
 3    1kΩ              1kΩ resistor
 7    2N3904           NPN Transistror
 1    S8550            PNP Transistror
 1    ESP12E_DEVKIT    NodeMCU v2
 6    LED-IRTSAL6100   Infrared LED (IR)
 1    TSOP4838         IR Receiver and Demodulator

Link for buying at Filipe Flop:

• 10kΩ resistor
  
• 1kΩ resistor
  
• 2N3904
  
• S8550
  
• ESP12E_DEVKIT
  
• LED-IRTSAL6100
  
• TSOP4838
  

Pins:

• D1 (GPIO5) - IR Receiver
• D2 (GPIO4) - IR LEDs

How to use it:

The easiest way is to use it with ESPHome Here's an example of a configuration of a LG AC:

substitutions:
  name: "Bedroom AC"

esphome:
  name: bedroom_ac
  platform: ESP8266
  board: nodemcuv2

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Bedroom Ac Fallback Hotspot"
    password: !secret wifi_password

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:

remote_receiver:
  id: receiver
  pin:
    number: D1
    inverted: true
  dump: raw

remote_transmitter:
  pin: D2
  carrier_duty_percent: 50%

# Using a temperature sensor from Home Assistant
sensor:
  - platform: homeassistant
    name: "temp sensor"
    internal: true
    id: temp_sensor
    entity_id: sensor.bedroom_temperature

climate:
  name: "${name}"
  platform: climate_ir_lg
  receiver_id: receiver
  sensor: temp_sensor
  header_high: 3265us # AC Units from LG in Brazil, for example use these timings
  header_low: 9856us

References

• Circuit inspired by Harald Braun's IRBridge