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5 votes

USB to USB Back-Side Device Communications

I wonder, if two USB devices are connected to a single computer, may they correspond without any interaction with the host computer? No. In USB, all information flows through the host, and devices ...
Marcus Müller's user avatar
0 votes
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Powering a dc motor from a robotics set with a USB 3.0 PC port

I measured the motor with the speed and the maximum load I'd use and it showed 0.15A. I grabbed the shaft for 2 seconds to stall it and it showed 0.51A. So, I think my USB 3.0 port can handle the ...
Wizard's user avatar
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7 votes
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Does USB-C Power Delivery require both CC pins or D+/D- pins?

USB PD on Type-C does not use the DP/DN pins, only the CC pins. Or rather, only one pin at a time, and the pin depends on which orientation you plug in the cable to connector. The first connector with ...
Justme's user avatar
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4 votes

Does USB-C Power Delivery require both CC pins or D+/D- pins?

24-pin connectors are clearly overkill, but 12-pin "USB2-only" connectors do exist and are quite easy to source and solder. Looking for them on famous resellers gives me tons of results. You ...
Nipo's user avatar
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3 votes

Does USB-C Power Delivery require both CC pins or D+/D- pins?

I am struggling to find a USB-C connector with these signals available. Complete USB-C connectors have contacts on the mating face for all 24 lines. Here is a list on Digikey. The PCBs will be ...
Davide Andrea's user avatar
0 votes

USB Switchable charger/data hub

No, the understanding how USB-C works is not correct. When two things are plugged together, the role of the devices is negotiated even before anyone is allowed to turn on any supply. And it sounds ...
Justme's user avatar
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0 votes

Solder pads ripped - charging via test pads?

Thank you for the additional picture, which allows us to see that: Yes, you can wire a new USB connector to those test pads. Use a meter in the Continuity mode to find out which pad is for which ...
Davide Andrea's user avatar
0 votes

How do I troubleshoot the ESP32 USB JTAG/UART interface on a new PCB design?

It turns out our D+ pin didn't have enough solder to the ESP32. In case it helps someone else, this is how we troubleshot the issue: First, get a USB-C breakout passthrough board (passthrough is ...
KJ7LNW's user avatar
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0 votes
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Is this circuit safe to be powered via USB for my 3 V 350 mA LEDs?

No it isn't safe. Do not use an USB port as a power supply. The USB port tries to output 5V but your LEDs clamped the voltage down to 3.2V like you described because the current is not limited in any ...
Justme's user avatar
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0 votes

Custom PCB using ESP32 is rebooting infinitely after upload

Beside tons of software related stuff that could cause bootloops (broken firmware, wrong partitioning, corrupted bootloader), the one apparent thing in your circuits are the missing pullup resistors ...
Sim Son's user avatar
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2 votes
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How to connect multiple devices using one USB port and a breadboard?

You have 2W x 2 actuators x 8 devices = 32W. The maximum you can reasonably get out of a single USB port at 5V is 15W, most chargers can even only deliver 10W or less. So that's not going to work. ...
PMF's user avatar
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1 vote

Finding the exterior dimensions of a USB type-c receptacle

After 20 minutes of googling I found one manufacturer publishing a drawing with radius R1.20 for U06-CFXX5R-W069 receptable - this looks correct. Relevant part shown below. Keep in mind thet outside ...
kiler129's user avatar
  • 121
1 vote

Is it possible to send 18 watts via USB-A?

Yes, it is perfectly possible. The power adaptor for my phone has a USB-A port and came with a USB-A to USB-C cable. Its markings give its rating as 18W and it can supply the following output voltages ...
Finbarr's user avatar
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0 votes

Is it possible to send 18 watts via USB-A?

Here's a screen clip from a Huawei website describing one of their 88W chargers: The cable is marked 6A which would be 30W. So the answer to your title question appears to be 'yes'. It's implied that ...
Spehro Pefhany's user avatar
0 votes
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How to position the 1.5 kΩ pull-up resistor on USB Type-C D+ connection?

The datasheet says FT232R chip has an internal 1k5 pull-up resistor on D+. You don't need an external 1k5 resistor on D+. Depending on what you want to achieve, you may not need the FT232R either. The ...
Justme's user avatar
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1 vote

Standard USB OTG to USB C IC

You have an OTG device. It is either host or device. The USB pins being host or device is defined by the ID pin. In host mode it must output power out. In device mode it must sense when 5V is present ...
Justme's user avatar
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1 vote
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DIY project - Listen to Guitar Amp on a USB headset

What you're asking for is not a simple wiring hack. The Kraken USB headset, from the USB point of view, is a digital device. In fact the Kraken has a DAC in it. For it to work, it needs a digital ...
hacktastical's user avatar
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