Since Philips launched its smart wireless lighting system Hue, the domestic market has also launched a number of wireless
smart LED lighting solutions controlled by WIFI or Bluetooth. Without exception, the user can control the switching, brightness, and color of the LED light through the client installed on the mobile phone.
Recently, I also got an engineering prototype of a scene lighting LED lamp from the domestic intelligent lighting manufacturers - iMagic, yes, this is the iMagic crowdfunding time. According to the designer, this is a wireless smart LED light with the latest BLE (Bluetooth 4.0) technology. It can wirelessly control the opening and closing of LED lights through smart devices, adjust the color and brightness of lights, set timer switches and light music. rhythm.
iMagic looks and is easy to use
Let’s take a look at the box.
Open the box to see
Currently iMagic Bluetooth supports only IOS control, so I took out the ipad, downloaded the app, and prepared to experience its service.
The app is opened for the first time. This light needs to be paired with other Bluetooth devices. Everyone knows that after performing the pairing, the switch, brightness adjustment, color adjustment, distance and other aspects of the lamp have been tested. Satisfactory.
In addition, this client also has a light music rhythm control function, the user can import music through the APP, and then let the light follow the music rhythm to change. I have to say that this is really a good experience, who knows who.
Of course, if you just indulge in the electro-optical phantom, a "hyun" evaluation will kill you engineers who want to see the excitement, I believe you will not agree. So decided to take it off. Before dismantling, let's take a look at the specific parameters of this LED light:
To be honest, I haven't dismantled this stuff before, so I am so entangled. First, I will take down the lampshade at the bottom. You can see the lamp beads and resistors on the PCB board. There are 11 Osram lamp beads.
After removing the fixed screws, I found that when I wanted to go deeper, I didn’t know how to start. After careful observation for a while, it was impossible to disassemble without destroying the mold. For the sake of the public, we have only adopted a violent approach. There is a fixed plastic ring between the threaded lamp head and the heat sink base. From here, the pliers, the tweezers and the scissors are all used. After the plastic ring is cut off, the heat sink base is removed by me.
At this time, I still can't see the true body of the wireless module and the buck module. In order to find out and avoid destroying the PCB board, we only start with the threaded lamp head. The tool used here is still scissors. After cutting the threaded lamp head. We finally saw the Bluetooth module and the power module:
Monolithic component
Power module
After a preliminary understanding of the overall structure of the lamp, let's take a look at the functions of each module:
After learning about the entire system, we continue to explore the key components of the entire smart LED light - the composition of the Bluetooth and LED driver modules, as shown below:
After reading the PCBA board above, let's take a look at the block diagram of the entire system:
LED driver we commonly use constant current drive, and iMagic selects PAM2861 chip, PAM2861 is a buck converter in continuous operation mode, built-in high-precision current detector, can set output through external resistor The current and current detection voltage is extremely low, only 0.1V, and the output constant current accuracy is 2%, which is very beneficial to prolong the service life of the LED lamp bead products, and also makes the lighting effect more realistic.
The Bluetooth module adopts TI's CC2540 as the main chip, and has a direct drive function. It has four PWM outputs for lamp adjustment by configuring the module parameters. It can send wireless to the module without adding any processor. The instruction acquires a series of functions such as ADC and timing switch.
Here's a simple comparison between iMagic and Hue, which was recently launched by Philips:
If that is good, you will judge yourself.
Overall, this product is still good, according to Xiaobian, the price is 199 yuan, which is very practical for home lighting and stage lighting. In addition, the Android version of the client of iMagic is open source. For those interested engineers, you can develop your own client.
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