Hi. I am making custom ESP32 boards, but I wish to remove the CP2102 programmer IC from the board for prototyping, because it costs quite a bit to have it on every board. I am making an external programmer. I want this to be as small as possible. I'd appreciate a review of my circuit. I am following...

There was an oversight on my side. The PCB assembly used 1k ohm resistors instead of 5.1k ohm. I changed the resistors, and it works perfectly now.

While I have your attention, are there any suggestions you have for the layout of my tracks? Is there anything I could do better?

Hi. I have a custom board design that uses USB-C in USB 2.0 mode for data and 5V power. I am aware that in order for a USB-C host to recognise the USB-C peripheral, it requires a 5.1k ohm resistor on both CC1 and CC2. I have placed these resistors on my board. When using a USB-C to USB-A cable, I am...

Not on the chip/module datasheet (https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf), but on the devboard schematic: https://dl.espressif.com/dl/schematics/esp32_devkitc_v4-sch.pdf. This is also where I got the value for my first RC delay circuit (R=10k, C=0...

Yeah, remove that. Likely it's empty when you boot up and it is only charged by the internal pullup on GPIO0, so there's a high chance the ESP32 comes out of reset and sees GPIO0 low, causing it to boot into download mode rather than start your application. Thanks for the suggestion. I found a timi...

I do. It is 0.1uF. Here are the rest of the schematics

I have made a board using the ESP32-WROOM-32D N16 module. I have flashed it with code. When pugged into the laptop via USB, the UART kicks in and resets the board, and the code runs without needing to manually press the reset button. When powered on via and external power supply, it requires you to ...

Here are the schematics for my PCB: Power schematic: 2.png USB programmer schematic: 3.png Here is the PCB design: 5.png Note: the green lines are islands that were not filled correctly. I have taken a dremmel and cut these islands. Tested with a multimeter, the islands are no longer connected to th...

I think you must troubleshoot your PCB also. See if there is any broken trace or short circuit. Hi. I've gone with a multimeter, checked that 5v, 3.3v and ground are not shorted. Check continuity from the USB programmer to the ESP chip's RX and TX pins. All that should be connected is connected, al...

Are you sure you don't have a terminal open while uploading? You can't have two programs on the same serial device, and the OHAI message does suggest that's what you have. (OHAI is a handshake for the flashing stub) Hi. Yes, 100% sure. If I purposefully leave a terminal open, then try to flash it, ...