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willemcvu / gCAN-gauge

An open-source ESP32-based programmable digital gauge targeted at EV conversions
MIT License
3 stars 2 forks source link

PSU feedback pin unconnected #1

Open kamocat opened 2 years ago

kamocat commented 2 years ago

The buck regulator needs the feedback pin (pin 3) connected to 3.3Vout to regulate the voltage properly. If left floating, it may supply a whole 12V to the ESP32.

willemcvu commented 2 years ago

Indeed! I bodged this on the first boards I got made.

Unfortunately I kind of ran out of time and interest on this project before I even debugged why my dev board setup could drive the LCD fine but this PCB couldn't. Got backlight but no picture with the same firmware and pinout.

On Mon, Apr 11, 2022, 12:47 AM Marshal Horn @.***> wrote:

The buck regulator needs the feedback pin (pin 3) connected to 3.3Vout to regulate the voltage properly. If left floating, it may supply a whole 12V to the ESP32.

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kamocat commented 2 years ago

Oh. It might have been clock skew or parasitic capacitance. All sorts of things happen on high-speed busses.