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Trying to get an RTK Fix with LCH29DA

IoT Modules GNSS Module

gsm-modules

bamarcant October 14, 2025, 8:44pm 16

Similar issue

LC29HEA UART i/o pin drive capability? GNSS Module

@george.gao I have a Mozihao LC29HEA board and noticed that the UART TX output has trouble driving some pins on an esp32 chip. The hardware reference shows the following: [image] It recommends a direct connection at 3.3v, which is consistent with an esp32. However, the Mozihao module has a 1K resistor in series with the TX output and this is not able to drive certain input pins on the esp32. I have reduced the resistor to 100 ohms, and that resolves the problem, but I was wondering what the …

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