{"id":5487,"date":"2025-09-19T07:15:51","date_gmt":"2025-09-19T07:15:51","guid":{"rendered":"https:\/\/open-boat-projects.org\/?page_id=5487"},"modified":"2025-09-19T07:17:10","modified_gmt":"2025-09-19T07:17:10","slug":"multifunktionsdisplay-obp40-v1","status":"publish","type":"page","link":"https:\/\/open-boat-projects.org\/en\/multifunktionsdisplay-obp40-v1\/","title":{"rendered":"Multifunctional display OBP40 V1"},"content":{"rendered":"
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Here's something new from the DIY lab. After receiving an email advertising China displays, I was notified by Elecrow that CrowPanel 4.2<\/a> It's an open-source ePaper display based on the ESP32-S3 and uses the same 4.2" display as the original OBP60. It also features a jog dial, two buttons, and an SD card adapter. The CrowPanel 4.2 is extremely simple and very low-cost. It costs just \u20ac28.61. The board is single-sided. The display is glued to the back. Three laser-cut Plexiglas panels form the housing, held together with four screws. I love this type of construction because it's reduced to the absolute minimum.<\/p>\n

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Fig.: CrowPanel 4.2 (Elecrow)<\/p>\n

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Fig. Circuit board (Elecrow)<\/p>\n

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Fig. back (Elecrow)<\/p>\n

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The CrowPanel 4.2 is powered by a 5V USB-C port. There's also a socket for a LiPo battery, which can be used to power the display independently. A 20-pin header on the top edge connects to a few GPIOs and the 3.3V power supply.<\/p>\n

Overall, the display is ideal as a gateway for testing or simple applications below deck, where the display isn't exposed to harsh conditions. Because the OBP60 firmware is modular, it was easy to adapt to the CrowPanel 4.2 firmware. After four hours of work, the display was up and running and displaying initial data.<\/p>\n

In principle, the display can be used to display all bus data if you use a bus-capable device such as the OBP60 or an M5Stack Atom with firmware that includes the NMEA 2000 gateway. The data is then transferred to the CrowPanel 4.2 via a Wi-Fi connection, where it can be displayed as usual with the OBP60. This allows you to build an instrument display for the chart table, for example, so you always have all the data at a glance. If you want, you can even use two displays simultaneously.<\/p>\n

However, there are also some limitations for the OBP40:<\/p>\n