Hi,

I'm new to this forum and new to electronics as well. I'm trying to fix a USB controlled traffic light which for some reasons can't be recognised anymore by my Windows system. Each of the light could be controlled by a PC but now it is not possible. Power still goes through the device because all lights are lit after connecting to a PC.

I'm trying to reverse engineer the PCB so I can figure out if I can fix the device or maybe use my raspberry Pi to control the light. I have a sketch of the circuit diagram which I've reverse engineered (probably with errors because of my knowledge). I still can't figure out what two components are and what their functions are to get a better understanding of the diagram. Hopefully some of you know the answers.

I think the micro controller causes current to flow to the triangle (marked "I?") and blocks the flow in some way? Maybe if I know what the component marked "I?" is I can come up with a better explanation. I also can't figure out what the component is next to the micro controller (marked "II ?").
The block marked (2) and (3) are the same parallel circuit as the one with the three LED's (each color of the traffic light uses three LED's).

Any help is welcome.

 

Does it enumerate when USB is plugged in?

 

Big chip is Cypress CY7C63813-SXC USB Peripheral Controller.

As @GetDeviceInfo suggests, click on Start and go to MyComputer>Properties>Hardware>Device Manager.
Expand the USB Controller tree.
Plug in the USB device and see if the PC recognizes the USB device.

 

Followed the above steps, the PC doesn't recognize the usb device. There is also no sound from the PC when connecting (usually does for new devices). Only the lights of the traffic light are lit.

Yeah. I found info about the big chip. Still don't know what the smaller 6 pin component (the one beside the big chip) is and the 3 pin one (triangle in my diagram).

 

Did you try another USB cable?

 

The USB cable is attached to the device. I did try a continuity test of the 4 pins of the USB connector leading to the PCB (red, green, white, black cables). Is that a good test for testing if data can be sent/received through the cable?