Autodimmer for IKEA NYMANE
Description
This is an inner insulating case and the push knob for my automatic dimmer project for IKEA NYMANE swing arm wall lamp (art No. 103.569.62) that replaces the original dimmer supplied with the lamp. For the code and PCB check: https://github.com/ilyushkin/auto_dimmer The lamp is turned on and off by pressing the button, unlike the original version, where you had to turn the knob to power it on. The main advantage of this approach is that the brightness setting is not reset every time the lamp is turned off. The brightness is adjusted by rotating the potentiometer knob. If the button is held pressed for more than 2 seconds, an auto-dimming mode activates with a 20-minute countdown, during which the lamp will gradually dim from the current brightness to zero. This is convenient for not falling asleep with the light on. The logic is somewhat similar to the dimming-out functionality of the Philips Wake-up Light alarm clock, just without all the bells and whistles. I decided to use the RV09 potentiometer because it was the easiest way to retain the brightness level between MCU power cycles. For this reason, I chose not to use a rotary encoder (e.g., EC11 with an integrated button), as that would require storing the actual brightness level in EEPROM. I used a simple linear potentiometer without an embedded button, as potentiometers with built-in buttons are rather rare, plus I already had the RV09 in stock. Since the potentiometer lacks a button, the design includes a plastic inlay that fits inside the metal cap of the original control knob to make it pushable. This inlay allows the entire knob to slide slightly along the potentiometer shaft and press the pushbutton through a plastic spring-loaded lever mounted next to the potentiometer on the PCB. The microcontroller is powered by an non-isolated power supply based on a capacitive voltage divider, as all parts of the lamp are double insulated with this case. In this design I reused the screws from the original internal plastic structure that the lamp came with.
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