Oh, yeah, you have to use an amplifier to cover that distance. E.g. use something like this:
You can use a higher voltage on the other side to go farther.
I am using only 1 meter wire, for that also I have use amplifier for get 3V?.
Hi, your wire shouldn’t have such a voltage drop. Check your wire resistance. It should be less than 1 ohm.
I ordered what you recommended, how can I use this.
After detecting the shape in openmv cam p1 will get energy’s.
So I’ll get 3.3V from openmv cam. Where I want to connect positive and negative wire in amplifier which you recommended.
Thanks in advance
What is the load at the end of the wire? If it’s a relay you need to use a transistor driver to drive the relay.
Would you happen to have a similar shape detection algorithm for C++??
please and thanks in advance!!
No, not really.
that link is broke. is there a new one? 
You didn’t specify a link on a 4 year old thread.
thank for your reply so quickly。i find this
http://booken.openmv.cc/example/17-Pixy-Emulation/pixy-uart-emulation.html.
is it right one?
That moved here: https://github.com/openmv/openmv/tree/master/scripts/examples/07-Interface-Library/01-Pixy-Emulation
thank u