Dead serial port and Arducam deep sleep power question on ESP8266 Nano V2

SPI Cameras
1

Hi all. I’ve got the Arducam 2MP Camera Shield Evaluation Kit — the Mini Camera Shield with the OV2640 2 megapixels lens — hooked up to an ESP8266 Nano V2 board, and I’m running into what I’d describe as a ‘serial port dead’ problem. The platform is ESP-8266. The board powers on but I get nothing over serial. Here’s a screenshot of what I’m seeing:

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Any ideas where to start?

2

Welcome! To narrow this down, could you tell me exactly what ‘dead’ means in your case — is the COM port missing entirely in Device Manager, or does it appear but the serial monitor stays blank? Also, what OS and Arduino IDE version are you on, and how is the camera shield wired to the ESP8266? And what have you already tried, if anything?

3

I’m on Windows 10 with the Arduino IDE, and honestly I haven’t tried much yet — this is my first time with this board. When I plug it in, no new COM port shows up and the serial monitor stays empty.

Separately, I had a question about deep sleep: if the Arducam is tied to the 3.3V line, what stops it from drawing power when the ESP goes to sleep? Does CS control the power state of the Arducam?

4

Let me take the deep sleep question first. If the Arducam is connected directly to the 3.3V rail, nothing stops it from drawing power during deep sleep — that rail stays live while the ESP8266 sleeps. CS is the SPI chip select, so it controls communication only, not power. To actually power the camera down during sleep you’d need to switch its supply with a load switch or a P-channel MOSFET driven by a GPIO, or use a regulator with an enable pin.

For the serial issue, start with these basics:

  1. Make sure your USB cable is a data cable, not charge-only — this causes a lot of ‘dead’ serial ports.
  2. The ESP8266 Nano V2 typically uses a CH340 or CP2102 USB-serial chip; install the matching driver and check Device Manager for a new COM port (an ‘unknown device’ means driver issue).
  3. The ESP8266 bootloader prints at 74880 baud; sketches usually run at 115200 — try both in the serial monitor.
  4. Confirm the board is powered at 3.3V and not 5V.

Run through those and let me know what you see.

5

Thanks for the deep sleep explanation, that makes sense. I’ll go through the serial checklist this evening and report back. One thing I can already say: I’ve been using a random USB cable from a drawer, so that could well be part of it. I’ll grab a known data cable and check Device Manager after installing the driver.

6

Perfect, the cable is a great first suspect. To summarize where we stand: the problem is reported as ‘serial port dead’ on the Arducam 2MP Camera Shield Evaluation Kit with the ESP8266 Nano V2 (ESP-8266 platform). We’ve covered the deep sleep question — the camera stays powered on the 3.3V rail unless you switch its supply externally, and CS does not control power. For the serial issue, no root cause has been confirmed yet and there’s no final fix at this point; we’re waiting on the results of the basic checks (data cable, USB-serial driver, COM port in Device Manager, baud rate, and 3.3V power). Please post back what you find and we’ll continue from there.