Light control office/wellness-area

The idea

Install indirect lighting in a large basement room.

The room is divided into a working and a wellness-area.

Each area should be indirectly illuminated in the wall/ceiling corners through led stripes.

Components

• Paulmann Duo Profil 2m (70267)

• Self-printed corner profile holder

• NodeMCU as mqtt gateway

• 4x 5V relays to controll the power supplys

• 4x 24V LED power supply

• LED Stripes white, warm white, and blue

• Cabel 2x0,75mm²

The first prototype

To find out what it might look like and check if the self-printed corner profile holders work.

Room with LED planning

• The ceiling of both areas should be illuminated with neutral white light

• In the wellness area the walls should be illuminated with a warm white light

• and in the office the wall light should be blue

• Vertical lighting is installed in selected corners and passages

Led Stripe

For the ceiling I have selected a Stripe with white and warm-white LEDs:

• 240 SMD LEDs / meter

• Chipsatz 2216

• Power per meter: 19,2 Watt (7,9 W / Chip)

• Light flux: 1680 Lumen/m

Length calculation LED-stripes

Distance profile to wall ~2cm

Led stripe separable every 5cm

Area	calculation	Alu profile
Office ceiling_up	5,22m + 7,3m	12,52m
Office ceiling_down	5,22m + 3,65m	8,87m
wellness-area ceiling_up	6,92m + 7,3m + 1,32m	14,22m
wellness-area ceiling_down	6,92m + 3,65m + 1,32m	10,57
both wall	0,65m x 6	4m

Length calculation power

The longest supply line is about 6,5 meters.

In total (16m office + 28m wellness-area about = 44m

Since there are long distances we use 24V.

Assumption the wellness-area white leds have 19,2 watt per meter: 19,2w * 15m = ~300 watt total.

The power supply is divided between two cables = ~150 watt.

With a cable cross section of 1.00mm² this leads to ~5% voltage drop (which is okay).

Power supply

• Power per meter: 19,2 Watt (for ceiling_up and wall)

• Wall Stripe = 65cm ~12,5 Watt

Area	Direction	Length LED	Length cable	Watt	Ampere
Office	ceiling_up	12,5m	2x4m	240w	10
Office	ceiling_down	8,85m	2x4m	(170w)
wellness-area	ceiling_up	14,2m	2x7m	273w	11,34
wellness-area	ceiling_down	10,5m	2x7m	(201w)
both-areas	wall	7,8		150w	6,25

Component corner profile holder

To design the aluminium profile mounting I used tinkercad.

It is for free, runs in browser and is easy to use.

Requirements:

• Compatible with Paulmann Duo Profil 2m (70267)

• Fits for Plasterboard screws 3.9 X 45mm

• Should act as cable fixation

If you want to download the stl file klick here

Now the slicing. There I used Ultimaker Cura with the following parameters:

• Infill Density: 40%
• Printing Temperature: 200C
• Build Plate Temperature: 60C
• Print Speed: 60mm/s
• Support: No

The series production has started.

Component Node MCU

As basis for the sketch I used the iot_multisensor.

The biggest difference is that the light control also controls outputs.

Hardware settings

const int RELAYS1 = D2;
const int RELAYS2 = D3;
const int RELAYS3 = D8;
const int RELAYS4 = D7;

void setup_sensor(){
  pinMode(RELAYS1, OUTPUT);
  ...
  digitalWrite(RELAYS1, HIGH);
  ...
}

Now we can control the relays with the digitalWrite() function.

// activate
digitalWrite(RELAYS1, LOW)
// and to disable again
digitalWrite(RELAYS1, HIGH)

Pinout

NodeMCU

GPIO	device	GPIO	device
A0		D0
G		D1
VV	[red] 5V out	D2	[green] CH1
S3		D3	[orange] CH2
S2		D4
S1		3V
SC		G	[blue] GND
S0		D5
SK		D6
G		D7	[brown] CH4
3V		D8	[yellow] CH3
EN		RX
RST		TX
G		G
VIN		3V
-	===	===	-

4-Relais Modul 5V

GND	IN1	IN2	IN3	IN4	VCC
blue	green	orange	yellow	brown	red

MQTT interface

To control the relays from remote we use a new /set_ch/ endpoint.

v01/esp/basement_light/set_ch/ + <RELAYS>

void setDefaultTopics(){
  topic_sub_set_ch =      default_prefix + esp_name + "/set_ch/#";
}

client.subscribe(topic_sub_set_ch.c_str());

The callback function gets expanded

void mqtt_callback(char* topic, byte* payload, unsigned int length) {
    String topic_set_ch = default_prefix + esp_name + "/set_ch/";

    if(t == topic_set_ch + "1"){
        set_ch(t, (char*)payload);
    }
}

void set_ch(String t, String p){
  if (p == "on") {digitalWrite(RELAYS1, LOW); sendResponse("set_ch1: on"); }
  else if (p == "off") {digitalWrite(RELAYS1, HIGH); sendResponse("set_ch1: off");}
  else sendResponse("set_out ERROR: " + p);
}

Set RELAYS from NodeRed

Internaly at NodeRed the following topic is used:

v01/node_red_cmd/esp/<ESP_NAME>/set_ch/<RELAYS>

• ESP_NAME example: control_light
• RELAYS: 1, 2, 3, 4

Payload: on, off, switch

This code is added to the rule engine function

if(t.startsWith('v01/node_red_cmd')){
    ...
    if(t.startsWith('v01/node_red_cmd/esp/set_ch')){
        mqtt_msg.push({ topic: t.replace("/node_red_cmd", ""), payload: p });
    }
    ...
}

Now the relays can be set by this mqtt message:

• topic v01/node_red_cmd/esp/basement_light/set_ch/1

• payload off or on