[Creative PCB] Moon night light with integrated Internet phone

Mid autumn moon lantern

The moon night light drawn on the octagonal circuit board, "We share the beauty of the moon thousands of miles apart" integrates an Internet phone. I hope I can use the same moon light to talk to my home.

Function

• Support WIFI/Bluetooth
• RGB light array
• stereophone
• speaker
• recording
• Support JTAG debugging

Experimental features

• Integrate JavaScript interpreter and API to support secondary development of JS
• Pair two moon lamps for online voice calls
• Stereo headphone and headphone recording and keying

interface

• SD card
• 3.5mm headphones
• JTAG debugging interface

RGB moon lamp; integrated audio amplifier and speakers, supports stereo headphones, onboard microphone and headphone microphone recording; SD card multiplexing JTAG debugging, full-speed SDIO mode; integrated lithium battery charge and discharge management, low power consumption design standby RTC+ULP operation design Current <200uA, fine-grained power control, hardware RC power watchdog supports automatic self-power-off, design leakage <50uA, power button wakes up at any time, with switch, the power can be turned off manually;

USB Type-C power supply interface, a power switch, and two buttons. One button can wake up the device at any time, and the other button supports waking up the device in sleep state.

ESP32+WM8988, used for testing this version

PCB design

In order to be small enough, the above solution is placed on a PCB less than 5cm, with RGB on the front and WiFi module on the back. In order to ensure the audio quality, four power supply areas were divided so that they could not be accommodated. It was designed as a four-layer board, with the first inner layer covered with ground and the second inner layer covered with power supply and ground. There is some overlap in the area, because the front and back functions have overlapped, and considering the initial main test plan, it will not be optimized at this time. The PCB was drawn with AD, and the version here may not be optimized.

inner map

circuit board

Only the necessary functions have been soldered on the circuit board, and the headphone part will not be tested for the time being. Six of the RGB lights are a bit too bright, and just using one or two as a night light would be enough.

3D printed lunar shell

Moon spherical shell model, changes in the thickness of the inner wall will produce brightness changes, and it will look like the moon when lit. In order to facilitate light-curing printing and matching the base, holes have been opened on the bottom surface. With some supports in the middle, although there are still many islands that cannot be printed, it is enough as a decorative lamp.

It was printed in black and white. It was actually measured that the lunar lampshade should be printed with opaque resin. The spherical shell should be thick enough to leave obvious shadows, but not too thick to affect the brightness.

The white effect is okay. I added a little black to the white resin to try to adjust it to lunar gray. There was a color difference when taking pictures and it looked weird. The black was printed with "transparent black resin". Being too transparent will produce a weird refraction effect. It doesn't look like a moon, and it looks very weird during the day.

Light up the red moon, I hope the finished moon can look like the moon, I hope it can be recorded, I hope it can be played back normally, :)

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Lzyor-EPLC08-lceda8 @ 2021-09-07