pac-n90-raspi

IR remote control for DeLonghi PAC AirConditioners on Raspi with MQTT support for integration in homeautomation systems (i.e. OpenHAB).

Device Name	Status	Source
PAC N81	Working	pac-n90.c
PAC N90 Eco	Working	pac-n90.c
PAC NK76	Not tested	pac-n90.c
Honeywell HO-5500RE	Working	honeywell.c

Preparation of the Rasperry Pi

• Prepare a Raspi W Zero
• Prepare and wire an IR transmitter module (i.e. IR Transceiver)

PIN GPIO	PIN IR Transmitter
18 (GPIO24)	PIN DAT
PIN 2 (5V)	PIN VCC
20 (GND)	PIN GND

• Download raspian buster lite and flash it (i.e. Belena Etcher).
• Prepare with ssh and WiFi

touch /Volumes/boot/ssh
cp lib/wpa_supplicant.conf /Volumes/boot/
vim /Volumes/boot/wpa_supplicant.conf

• Boot it, and adjust hostname (and fixed IP on your router?) password raspberry (default)

ssh -lpi <your_ip>

sudo su
echo klima-raspi > /etc/hostname

• Enable IR Mode for PINS by uncommenting the following lines:

apt-get install -y vim
vim /boot/config.txt 

dtoverlay=gpio-ir,gpio_pin=17
dtoverlay=gpio-ir-tx,gpio_pin=18

• Reboot the raspi
• Run install script for preparation /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/8cH9azbsFifZ/pac-n90-raspi/master/lib/install.sh)" or clone this repo and run ./lib/install.sh.

Configuration of the software

• Configure MQTT variables in the corresponding source file:

vim src/pac-n90.c

#define MQTT_ADDRESS              "t20:1883"     
#define MQTT_TOPIC_ROOT           "n90/"          
#define PAC_NAME                  "DeLonghi PAC N90 Eco"        
...
#define CLIENTID                  "<<clientId>>" // FIXME

• Build and install the software

make pac-n90
make honeywell
make install
sudo systemctl start  pac-n90
sudo systemctl enable pac-n90

Reverse engineering a new remote

• use the gcc bits.c, showbinaries.py and showpulses.py in lib
• extract the bit patterns using stuff like: showcodes.py in lib

Testing the installation

• Install mosquitto, i.e. on osx: brew install mosquitto

mosquitto_pub -h t20 -t pac/toggle/power -m off
mosquitto_sub -h t20 -t pac/power
mosquitto_pub -h t20 -t pac/toggle/temperature -m 30

Example configurations

• Relevant fragments for configuration of OpenHAB are given in examples.

References

• Excellent description how to build this repo
• Bit masks for N90
• IR Slinger library
• Bit masks for NK76
• Reverse Engineering of an air conditioning control