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Under kitchen cabinet LED lamps

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    Under kitchen cabinet LED lamps

    Just an FYI relating to doing this for the first time in the Kitchen. Over the years have tested LED lamps mounted in the garage kitchen cabinets (supply cabinets) using 120 VAC hockey puck style LED lamps and basement workshop cabinets using illuminated tubes. Probably adding LEDs over and under the kitchen cabinets. Redoing post here as implementation and hardware changed a bit.

    Hardware List:

    1 - small LED 120VAC to 12VDC power supply. I chose the following one because it fit inside of a 4" X 4" X 1.5" metal electrical box.
    These are priced under $10 on Amazon and Ebay. These are available as 1 AMP to around 2 AMP same size.

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    2 - Leviton Decora style two paddle 120VAC 15 AMP switch. ~ $10.00 at your local big box hardware store.

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    3 - LED light strip on a reel. Pick your color and density. Here used:

    LightingWill LED Strip Lights 16.4Ft Warm White SMD2835 300LEDs 3000K-3500K 72LM/Ft 12V DC for ~ $8.00 (Amazon).
    This one comes with a connected barrel connector and double stick tape which you peel off to fix to diffuser.

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    4 - LED mounting bracket with diffuser - will utilize these with either two of the above LED lamps. Here chose:
    Muzata 5 PACK 1M/3.3ft Aluminum LED Channel for LED Strip Lights, Easy to Cut, U-Shape Aluminum Profile with All Accessories for $16.99 on Amazon. Easy to cut and join pieces using included mounting brackets. Cut Aluminum with hack saw.

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    5 - plastic project case - Hammond 1591BSBK ABS Project Box Black - 4.4" x 2.4" x 1.1" (112mm x 62mm x 27mm) - $6.51 on Amazon.

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    6 - Dimmer module * Optional

    Hiletgo 3pcs DC12-24V 8Amp 0%-100% PWM Dimming Controller for LED Lights on Amazon for $7.99.
    Took it apart here and used the dimmer circuit board and potentiometer.

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    7 - Sonoff SV - Geekworm DC 5V-24V 80MHz 160MHz 32-bit WiFi Wireless Switch w/ Safe Voltage Module $12.49 Amazon

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    8 - 14 guage solid core black and white electrical cable and 16 guage stranded black and red automotive style cable.

    Total approximate cost = $72.00 purchasing from Amazon. You will have spare LEDs and diffusers when done depending on what you use for said project.


    Note this is working here with metal electrical boxes and conduit in the midwest near Chicago.

    1 - ran new black and white electrical cable from ceiling light box to wall switch. ~ 15 feet? There were two wires in switch box. I used one of the two wires to pull the black and white wires from end to end such that I had 4 wires in conduit. Black, white, orange and blue.

    2 - With the original switch removed connected the 12VDC 16 guage black and red wires to LED transformer and passed them through a hole in the metal switch box. Drilled a 1" hole in the drywall right under the wooden kitchen cabinet edge. Used some solid core cable to fish the low voltage wire to the top hole. Stripped and capped the two wires.

    3 - Connected the 120VAC black wire to new Leviton decora switch. Connected Leviton switch paddle terminal #2 to LED transformer 120VAC in. Connected white neutral wire to LED transformer 120VAC in. Connected switch wire (blue) to Leviton terminal paddle #1.

    4 - tested Leviton Decora double paddle switch to overhead lamp and LED transformer. For the transformer output used a VOM to see the 12VDC power out.

    5 - put LED transformer in box and mounted Leviton Decora switch to mudplate and installed Decora switch cover.

    6 - Wired / soldered 12 VDC 18 guage black and red wires to Sonoff SV ( 2 in and 2 out). Soldered 4 JTAG posts to Sonoff SV (3.3 VDC, Ground, RX and TX).

    7 - Connected JTAG pins to TTL/USB programmer and laptop running Ubuntu 18.04. Used ESP easy to program Sonoff SV via command line.
    8 - configured Sonoff SV to speak Mosquitto and talk to the HS3 plugin mcsMQTT.

    9 - configured Sonoff SV to default relay on when powering up device.

    10 - configured an mcsMQTT variable to toggle on and off relay.

    11 - assembled project box with Sonoff SV and dimmer module. Drilled hole in cover for potentiometer. Hot melt glued everything in place.
    Note position of two circuit boards allow easy access to JTAG pins just in case you need to reprogram legacy style versus OTA style.

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    You must accept that You and You Alone are Responsible for your safety and safety of others in any endeavor in which you engage. While the hardware list is provided in hopes that you build your own system, You are Responsible for verifying its accuracy and applicability to your project. You are Responsible for knowing your limitations of knowledge and experience. If you do any work with “main power” such as 120 or 240 VAC power wiring and you are leary of working with electrical you should consult a Licensed Electrician.


    1 - know how to utilize a soldering tool and solder and a VOM.
    2 - know how to upload firmware to a Sonoff SV
    3 - navigate and configure 3rd party firmware on the Sonoff SV
    Last edited by Pete; August 28, 2018, 09:59 AM.
    - Pete

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