Re: ESP32-CAM ov2640 exposure control/FREX mode
Posted: Thu Jul 11, 2019 11:06 am
I was made aware that FREX pin is NOT brought out to the 24pin connector.
I looked into what I measured, and found a ov2640 datasheet with connector pins described in figure 1:
https://www.mpja.com/download/ov2640data%20sheet.pdf
The first pin I measured at beginning of the thread was Y7, and that was connected to pin9.
But that was my own pin numbering, and it turned out that I used reverse order, and it actually was pin 24+1-9=16, which is DATA7.
So pin10 in my numbering is pin15 in datasheet, and that is DGND, the digital ground pin.
So what I measured was that pin B2 (FREX) seems to be pulled down to DGND.
Bad news is that accessing FREX pin B2 is not possible via the flat ribbon cable connector.
Good news from the last days is that a global reset can be consistently done as the global external shutter captures proved.
In another ov2640 datasheet it says "Supports LED and flash strobe mode":
https://www.uctronics.com/download/cam_ ... 2640DS.pdf
But I measured flat ribbon connector pin1 (STROBE) with Arduino IDE Blink sketch, and pin1 does not change.
I looked into what I measured, and found a ov2640 datasheet with connector pins described in figure 1:
https://www.mpja.com/download/ov2640data%20sheet.pdf
The first pin I measured at beginning of the thread was Y7, and that was connected to pin9.
But that was my own pin numbering, and it turned out that I used reverse order, and it actually was pin 24+1-9=16, which is DATA7.
So pin10 in my numbering is pin15 in datasheet, and that is DGND, the digital ground pin.
So what I measured was that pin B2 (FREX) seems to be pulled down to DGND.
Bad news is that accessing FREX pin B2 is not possible via the flat ribbon cable connector.
Good news from the last days is that a global reset can be consistently done as the global external shutter captures proved.
In another ov2640 datasheet it says "Supports LED and flash strobe mode":
https://www.uctronics.com/download/cam_ ... 2640DS.pdf
But I measured flat ribbon connector pin1 (STROBE) with Arduino IDE Blink sketch, and pin1 does not change.