Arduino: Arducam Mini w/ 2 MP OV2640 on Arduino Uno: Can't find OV2640 module

I am trying to get an “ArduCAM Mini 2MP Rev. B” to work with an Arduino Uno running version 1.6.5 of the Software, and the latest ArduCAM library from GitHub.

Oddly I am seeing the following error with the ArduCAM_Mini_OV2640_LowPowerMode example

Can't find OV2640 module!

I’ve verified that that both vid and pid aren’t updated by the two calls to rdSensorReg8_8.

Anything I am doing wrong, or things I could try?

Much apprechiated!

About this issue

Original URL
State: closed
Created 8 years ago
Comments: 19 (17 by maintainers)

Most upvoted comments

@ArduCAM Hi Lee, I did some testing and I believe I now know what happened:

I first tested the ArduCAM_Mini_OV2640_LowPowerMode example, because I was interested in using the module in low-power scenarios. This probably worked the first time, but starting with the second time it must have failed with Can't find OV2640 module!.

Why? Because the module, when idle, is in low-power mode, which persists even after resetting the Arduino Uno (or uploading a new sketch). Because the module is still in sleep at the beginning of setup(), the I2C communication via myCAM.rdSensorReg8_8(OV2640_CHIPID_HIGH, &vid) fails, and I never saw an ACK on the logic analyzer. (I sent a pull-request to fix that https://github.com/ArduCAM/Arduino/pull/91)

Then I tested ArduCAM_Mini_OV2640_Video_Streaming, but I must not have removed the module from power in the mean time, so - when the sketch was running the module must have still in low-power mode, and I was seeing the same error messages.

I tested with both modules. They both seem to work. Must have been this software issue!

gohai on Sep 26, 2016