The smart desk lamp designed by double MCU, let's disassemble it together!
Smart desk lamps collect and process optical signals through light sensors and smartphone cameras, using leading optical calibration algorithms to illuminate the light for optimal working or reading conditions, maximizing visual comfort. Connect to the smart home app with the push of a button and you'll be able to turn on this wonderful lighting journey.
Tools required for teardown
Screwdriver, cymbal, heat gun, scorpion, scissors
Step 1: Remove the base
â–² desk lamp base
1. 5V/1A USB power output, main board 12V power supply (see below for details)
2. Motherboard 12V power supply line
3. Main control board ----- wifi & sensor switch control LED light switch and brightness
4. Counterweight iron ------ balance lamp body
Step2: Fold down the power board
â–²The front of the power board is very delicate, and the components are arranged in an orderly manner.
1. Red box IC model: XLSEMI XL2905---Domain core power chip, this chip is mainly stable performance, widely used in LED driver and car charging equipment.
2. Blue box IC model: SS34 Schottky diode----reverse isolation, popular speaking 3. The power chip is powered by the USB interface, so the design can better protect the phone from receiving Damage to poor quality charging equipment.
3. Green box: resistance
4. Yellow box: capacitor
â–² back of the power board
1. 12V DC output interface
2. 5V/1A USB charging interface
3. 12V motherboard power supply interface
4. Capacitor ----- This design will better protect the home line
5. Inductance ------ reduce the noise of the desk lamp and prevent the heating of the electrical equipment
Step3: Remove the main control board
â–²The circuit board is exquisite in workmanship, and the components are arranged in an orderly manner.
1. Blue box IC model: STM32F030C8T6 has 64K Flash capacity, low speed and low power consumption. It is a mid-range ARM microprocessor product of STMicroelectronics. It is applied to a desk lamp with such a price. It is guaranteed to be real.
2. Red box IC model: After the shield of Xiaomi wireless intelligent control module, it is found that the main control adopts 88MC200-NAP2 high integration low power microcontroller by using Marvell EZ-Connect wireless IoT platform chip solution. 88MC200 chip adopts ARM Cortex M3 core, running speed is 200M, built-in 1M Flash ROM and 512K RAM, 88MC200 microcontroller is mostly used for main control chip of intelligent hardware and smart home products, Wifi communication chip adopts Marvell 88W8801-NMD2 SoC chip, chip support 2.4G band 802.11n wireless protocol, produced by international manufacturers, with excellent performance, is currently widely used in high-end smart home products.
3. Yellow box IC model: BYD BF6961SA11, this is a BYD professional touch-sensitive button chip IC and capacitive sensor switch, which instantly enhances the overall appearance level, and the value of the face and touch is absolutely Feel good! ! ! ! ! !
4. Green circle: Capacitive sensing touch module can penetrate the insulating material shell up to 20mm (glass, plastic, etc.) and accurately detect the effective touch of the finger. It also ensures that the sensitivity, stability and reliability of the product will not change due to changes in environmental conditions or long-term use, and it is waterproof, dustproof and strong anti-interference ability.
5. Orange box IC model: MT7201D1506HC This is a continuous inductor current conduction mode buck constant current source, input voltage range from 7 volts to 40 volts, adjustable output current, up to 1 amp.
Step4: Remove the weight cast iron
â–²Working with meticulous weights, while ensuring that the center of gravity of the lamps does not shift, Philips is also careful about the insulating coating of cast iron, even the details of this place are taken into account, it seems that Philips this table lamp is not because of low prices And cut corners, not forgetting our safety.
Step5: Separation of the lamp body from the lamp holder
â–²Unscrew the two screws pointed by the arrow to separate the lamp body from the lamp holder. The life of the joint of the folding table lamp has been maintained before dismantling, but now I am not worried at all because it actually uses Steel hinges, steel hinges, steel hinges... important things to say three times! ! ! ! !
Step5: Disassemble the hinge
â–² Philips' lamp hinge design is quite classic, it can be said that it is bloody, not only the hinge is the steel inside the rotor is stainless steel (in the red circle), not only the rotor is stainless steel, even the outer cover (green arrow All) are stainless steel. If it is not for the wiring, this table lamp may even use stainless steel on the right side of the plastic rotor. It takes no more than four or five years to use the hinge for this work.
Step6: Disassemble the lower arm
▲ Zhirui table lamp arm design is very professional, there is no screw fixing, and the bonding is very tight. If it is violently dismantled, it may cause some damage to the lamp body. Before disassembling, preheat it with hot air gun for about three minutes. Left and right, and then use the cymbals to open a little bit, this process still needs patience, after all, if you really open it, we don't worry about it! After spending 20 minutes, it was finally dismantled. The 6 error-proof insertion holes further increased the stability of the lamp arm. I really couldn’t see the black and white table lamp with such a soft appearance. It’s really strong inside. It’s really a heart with a tiger. ". Surprisingly, the rose is far more than one. The wire passing through the hinge part is wrapped with an insulating sleeve, which not only increases the strength of the wire, but also improves the safety factor of the user. The other is a metal crimping plate, which is large. The crimping area makes the wire not pulled when the hinge is rotated, which effectively improves the service life of the wire, and ensures the safety of use while standardizing the wire.
Step7: Disassemble the hinge (between the lamp arm joints)
The specific process will not be repeated, and it’s really bad. ^^
Step8: Disassemble the upper arm
â–²The specific steps are similar to Step6, and the quality is the same.
Step9: Fold down the LED light board
The super-large and thick aluminum alloy plate has two functions. One is the fixed lamp plate and the other is the heat dissipation. It is well known that the bottleneck of the development of the LED lamp is heat. The heat problem not only affects the service life but also threatens the safety of the user, but with an experienced electronic From the point of view of the engineer, the Zhirui desk lamp with such a large area of ​​heat-dissipating aluminum alloy plate will not have the above problems. Fold down the aluminum alloy plate is the LED light board. You can see a 9 warm white LED patch light bulb light board, 4000K color temperature, D1-D9 are arranged in equal order, connected in series, the whole substrate is fixed by two screws. . The substrate is screen printed with the internal number ELT-E15609-01A. The production cycle is June 9, 2015. The positive and negative plates are directly soldered using solder. It can be seen that the soldering is quite firm.
Finally, I will give you a dismantling family portrait.
to sum up
1. Mobile phone-level double material injection molding process, integrated molding, color crystal, silky texture.
2. Steel hinge design, convenient angle adjustment - durable, rigid and feminine combination
3. Original honeycomb lens design----illumination uniformity, fine-grained texture, anti-glare.
1. Inductive switch----Optical isolation design, more safe, excellent touch, brightness display at a glance.
2. USB charging port design----The desktop is more tidy, the cable is simpler, and the IC chip is used to ensure safe and reliable charging. Zhirui----Your intimate jacket.
3. Wireless module - international chip, excellent performance
4. Dual MCU design - super processing power, faster, higher performance and more stable.
5. Touch IC - feel good
6.LED light source - wrapped insulating sleeve, heat dissipation super large thick aluminum alloy plate, safe and reliable
7. Power supply design - industrial grade IC control chip with built-in overvoltage and overcurrent protection.
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Cixi Xinke Electronic Technology Co., Ltd. , https://www.cxxinke.com