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Pixy2 does not return data to EV3

Pixy LEGO
#1

Hello, my Pixy2 for some unknown reason stopped working with EV3. When I try to receive any data the output values may be zeros on every byte or just the mirrored ones i send.

The LED on the Pixy2 and the Pixymon app are working just fine with the camera. I tried to connect it with different cables and checked the data out port in the app and the result is the same. I am using the self-made cables. I have also noticed that when I am trying to fix this problem my camera does not heat, how it was before.

I have my WRO national competition in just 2 days so I would really like to receive your answer on this topic ASAP.

#2

Hello,
So you are able to connect to your Pixy over Pixymon and it works fine? It sounds like the cable might be faulty. Have you checked it with an ohmmeter?

Edward

#3

Hello. Yes the cable works just fine with one pixycam, but not the second one. I can receive data if I connect the pixycam to arduino and I see the camera output in pixymon.

#4

Hello,
Here’s what I understand –
You have 2 Pixy2’s. The 1st one works fine with PixyMon, but the 2nd one doesn’t work with PixyMon or Arduino, and it doesn’t appear to be a cable issue. Neither of them appear to work with EV3, which is your primary goal. Is all this correct?

Edward

#5

No, I am sorry my post was so unclear to you. I have 2 pixy2s, both work fine with pixymon and arduino, but one of them works with ev3 and the other one doesn’t. I tried to connect it with uart and i2c, both ways aren’t working

#6

Hello,
I would guess that the I2C on one of the Pixys is somehow broken or defective. All I/Os on Pixy are protected against electrostatic discharge, but sustained exposure to voltages below 0V or above 6V will damage the I/O. Perhaps when making your own cable, you switched some signals?

Edward

#7

Hello, the ev3 doesn’t give out voltage higher than 4.3V, so there shouldn’t be any problem with voltage above 6V. We also tried to connect pixycam with each wire separately and tried to connect using the cable which worked with another pixycam.

#8

Hello,
If you reverse the voltage however, it’s possible to get below 0V unfortunately.

Edward

#9

I have a similar problem, but the camera turns on, but it stays with a red light, but does not send values, however, when I connect it to USB cable to the computer it turns on and works without problem

#10

Hello,
It sounds like a power issue. Are you powering the Pixy through the Arduino connector? And do you have RC servos connected to your Pixy?

Please check out this section on unregulated power:
https://docs.pixycam.com/wiki/doku.php?id=wiki:v2:powering_pixy#unregulated-power

Depending on your Arduino, some Arduinos (mostly the off-brand Arduinos) have trouble sourcing enough current for Pixy, resulting in Pixy not operating properly.

Edward