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Trådfri Smart Light
IKEA has expanded its smart home range and now also offers intelligent home lighting. The product range of the Swedish furniture company includes LED lamps and light panels as well as doors with LED lighting that can be dimmed by remote control and, in some cases, even changed in color temperature. The control works according to the Zigbee-Standard similar to the PHILIPS Hue System and can be via an IKEA Gateway controlled by an App. The Zigbee technology for the control is in each lamp itself.
At a price of 6.99 € for the LED lamp with GU10 socket this is pretty cheap, after all, it to include the controller, power supply and dimmer (PWM-Control). You can hardly get Zigbee-capable components cheaper. You quickly get the idea to look up and maybe abuse the control for your own projects. The Make article describes the first attempts at this.
Dismantle of the Zigbee controller
The LED lamp with GU10 connection can be easily opened by levering out the cover with a screwdriver.
The circuit board with the 5 LEDs mounted on an aluminum carrier for heat dissipation appears. The LED carrier is held by 2 screws and the soldered connection for the electrical connection to the control module.
hen remove the LED circuit board with a bit of desoldering braid and the control module with the transverse Zigbee controller appears.
The whole unit can be easily pulled out as it is only connected to the GU10 socket via contact springs.
The Zigbee controller can now be freed from the control module again with the help of desoldering braid. It is now available for your own projects.
The supply voltage for the module is 3.3V as usual. By the way, all lamps have the same module. For lamps without a white spectrum, only one PWM output is used and mode pins 1 + 2 are open. With the White-Spectrum lamps, Mode1 is clamped to 3.3V. I have not yet determined the function of Mode2.
If you also look into the other lamps, you can see the different electrical structures summarized here in a table:
Trådfri lamps
| LED Lamp | E27 1000lm (warm white) | E27 980lm (white spectrum) | GU10 400lm (warm white) | GU10 400lm (white spectrum) |
|---|---|---|---|---|
| LED Type | 18x LED3030 (2700K) | 12x LED3030 (2200K) 12x LED3030 (4000K) | 5x LED2835 (3000K) | 4x LED3030 (2200K) 4x LED3030 (4000K) |
| LED Anordnung | 2x 9 LEDs || | 2x 6 LEDs || (2200K) 2x 6 LEDs || (4000K) | 5x (LEDs || 56K) | 4x LEDs (2200K) 4x LEDs (4000K) |
| ILED module | ~400mA | 2x ~400mA | ~47mA | 2x ~200mA |
| VLED module | ~54V | ~36V | ~110V | ~26V |
Depending on the existing third-party LED lamp, you may even be able to reuse the entire controller. The E27 (1000lm) module can only be removed with great difficulty because it is completely encapsulated. With the E27 (980lm) lamp it is a little easier because the module is also cast in here, but internally encapsulated again. It is therefore easier to pull out.
The rear connection cables are either connected directly to luster terminals or, as shown in the picture, a soldered connection extends the connection range. For the other side I also lasered a protective cap so that only the LED connections and the Zigbee antenna protrude outside SVG file.
Own projects with the Trådfri controller
If you want to convert your own LED lights to Trådfri, you first have to look at the existing LED driver. The type of control is almost as diverse as the lights themselves. Here are two examples:
The right lamp fits pretty well into the control range of the original Trådfri module with white spectrum. Therefore the module from the E27 980lm lamp can be used completely. But be careful, we are handling mains voltage here. When installed, the control looks very compact.
The Zigbee communication even through the metal housing of the lamp works surprisingly well.
With the second LED luminaire, SMD LEDs are also arranged in parallel and therefore require a higher constant current of 1000mA. For the conversion, I now need a power supply of 3.3V and a PWM controllable LED driver for the Zigbee module. My choice a lot on the following components:
die dann zusammengeschaltet den neuen Trådfri kompatiblen LED Treiber ergeben. Zur Kapselung in einem gelaserten Gehäuse eingeklebt. Die 'neue' Leuchte verhält sich nun wie eine E27 980lm Trådfri Lampe und kann entsprechend angelernt werden. Natürlich lassen sich so auch andere Ströme und Spannungen mit einem passenden LED Treiber verwirklichen.
Falls man die in der Lampe vorhandene Konstantstromquelle verwenden will, läßt sich die Schaltung etwas vereinfachen. Das PWM Signal des TRÅDFRI Moduls wird dann auf einen Power MOSFET (z.B. IRLZ34N) geleitet. Das Ganze kann dann als Modul so aussehen:
Umbau OMLOPP/ANSLUTA LED Driver
Innerhalb der TRADFRI Serie gibt es LED Türen für den Einbau z.B. in Oberschränken doch LED Lichtleisten oder Regallampen fehlen (noch). Die alternative fernsteuerbare IKEA Regal- und Küchenbeleuchtung ANSLUTA arbeitet mit einem proprietären Protokoll im Frequenzbereich von 2.4362 GHz. Charmant wäre es diese Steuerung auf TRADFRI umzurüsten.
Das OMLOPP/ANSLUTA LED Power Supply beinhalten den Receiver der mit der ANSULTA Fernbedienung gekoppelt werden kann. Er arbietet als Konstantspannungsquelle mit 24V.
Das Schalten und Dimmen übernimmt ein Power MOSFET (FDD8880) der oben rechts zu erkennen ist. Die Receiver Platine ist ca. 40 x 27 mm. Dort ist also genügend Platz die TRÅDFRI Steuerung stattdessen einzubauen.
Die passende Schaltung sieht so aus:
Mit Hilfe einer Lochrasterplatine werden die drei Komponenten verdrahtet und an die Stelle des ANSLUTA Receivers eingeclipt. Aber Vorsicht, die Bauteile dürfen nicht mehr als 8mm vom PCB in die Höhe ragen. Damit der Gehäusedeckel auch wieder drauf passt hilft es vorher den Stift in der Mitte zu entfernen.
Nach dem Zusammenbau wird nur noch die Lampe angelernt werden und schon läßt sich das Licht auch in Regalen oder Küchen stufenlos mit TRÅDFRI steuern und dimmen.
