Video sensitivity trimming

[lemorlenny]

Hi,
I use the video experimenter to decode a flashing point position like in object tracking example,
my problem is that the sensitivity range trimmer work in only 2-3 mm from blind to saturate so its very hard regulate the right trigger sensitivity. It necessary change the trimmer or exists another solution?.

Regards

[Michael]

I think you could use an external pot connected to A2. If you make a voltage divider using another resistor, then the resistance of the pot will determine a smaller voltage range.

For example: connect the 5V source to 30K or 40K of resistance, then to the left lead of the pot. The middle lead of the pot goes to A2. The rightmost lead of the pot goes to GND. This way, the full range of the pot will provide 0V – 1V to A2 and this will allow finer adjustment.

I should have designed it this way in the first place.

[lemorlenny]

@Michael wrote:

I think you could use an external pot connected to A2. If you make a voltage divider using another resistor, then the resistance of the pot will determine a smaller voltage range.

For example: connect the 5V source to 30K or 40K of resistance, then to the left lead of the pot. The middle lead of the pot goes to A2. The rightmost lead of the pot goes to GND. This way, the full range of the pot will provide 0V – 1V to A2 and this will allow finer adjustment.

I should have designed it this way in the first place.

Many thanks for your reply, I’ll try it.

Regards

[Author]

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