BG2FAS 1. Improved based on the open-source MMDVM duplex hotplate project. 2. Redesign the PCB layout to a 4-layer board, enhancing the immunity between components. 3. Includes onboard lithium battery charging and discharging management, a power indicator light, and a built-in 3000mA polymer lithium battery. 4. The Raspberry Pi (Zero 2W) and the hot spot board are integrated using a surface-mount technology, which minimizes the overall thickness. 5. The board and frame dimensions are the same as those of the Taocheng 3.5-inch screen, with corresponding holes. 6....... Special thanks to: The 3D-printed enclosure was designed and manufactured by BI9BCQ!
BG2FAS yuzhou The cost of the board can vary greatly, but it will not exceed $200 (excluding the Raspberry Pi).
BG9JFN Could you please tell me where the screen connection interface for the Tao Crystal is located? I couldn't find it in the diagram. Is the 3.3V power supply interface for the LOED screen located in the top-left corner?
BI7ANY BG9JFN Next to the ceramic antenna on the left. It's great that it can be designed and fabricated independently; would the main poster consider creating a finished kit?
BG2FAS BG9JFN The one above the Type-C port on the left side is, essentially, a slightly modified screen serial port that can directly align with the board.
BG2FAS BI7ANY I use T135 for the screen, and there are many firmware versions available online for this model! I prefer to use WPSD, which has a full-featured driver for Micro Crystal screens, so once configured, I can use it directly without needing to flash the driver again.
BI7ANY BG2FAS I'm using your firmware because I developed it, and I want to collect user feedback.🤣 Original post https://forum.hamcq.cn/d/1770
BG2FAS BI7ANY Haha, so the original author of the screen firmware is here! I haven't actually tested your screen firmware yet. I sent a finished version of this "Akylic" version to a senior friend for testing! He should still be waiting for it. I'll ask him about his experience later!
BI7ANY BG2FAS The only aspect of this design that concerns me is the cooling. With the current configuration, it easily reaches +50°C without a fan, but adding a small 2010-style fan at 50°C would automatically start, which would be more suitable for long-term use.
BG2FAS BI7ANY Okay, I've considered that. There will be a separate pin on the board to provide power at 5V! I found a very thin fan made in Taiwan (available on Taobao) that is only 3mm thick, and it shouldn't affect the overall thickness.
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