Usb to audio out adapter?

Some stereos now have female usb sockets built into them to play music from a memory stick. Mine does not, which is why I am looking to make/buy a usb to 3.5mm audio out device that can read the files on my memory stick and output them as audio. I have done a concept picture using professional editing software 'Paint', but the sd card reader is not really that necessary. It could also be battery powered, the picture is just a basic idea of what I want. I have spare computers I could raid for parts if I need. Any help would be appreciated either building or buying such a device, but low costs for both are a big need.

Question by swass1   |  last reply


USB 3 device in a USB 2 socket? Answered

Just checking, but am I correct in thinking that a USB3 portable drive will work in a USB2 port, just more slowly?

Question by Kiteman   |  last reply


3.3V to 3V - Power a GameBoy Color from USB

I want to power my GameBoy Color using the USB port. It needs 3V ( 2 AA batteries). I found a voltage regulator, that puts out 3V, but it does not seem to be available in Germany. But there are loads of 3.3V regulators. So I wonder, how I could use one of those. Is it possible to simply put a resistor in row (if yes, what value would be suitable?) or is it a bit more complicated?

Topic by SpecieS~   |  last reply


USB charger? Answered

I want to make a usb charger with 3 ports in which I can plug my laptop adaptor (16v, 2.5A)and charge my phone and other usb devices. I am planning to use a Lm-317 to regulate the voltage. Will it be fine or I need to consider something else also? And please don't tell me I can buy one!

Question by Ahtasham Ahmad Mohtashim   |  last reply


Charging a small 3.7v battery from USB

Hey guys! I had this little flashlight that worked great for years. I would plug it into the USB port on the computer to charge it. When it broke I took it apart and it had a small battery connect directly to the 5v and GND of the USB cable. Is it OK to charge these small 3.7v batteries from just 5v without having to make a circuit? Is ok to just hook them up to 5v? http://www.xheli.com/hm-genius-cp-z-14.html?gclid=CJGkwffHuroCFUkV7AodY0kA8A Thanks!

Topic by HavocRC   |  last reply


Is there any way to turn a usb headset into one that uses 3.5mm jacks.

If anyone knows a way to do this it would be a great help.

Topic by rhds_rchrd   |  last reply


Extra battery power for 3.7 volt mini spy camera.

This unit is 3.7v, 240mah. Need to find a higher capacity, (2000Mah?) 3.7v batt that I can charge via usb. Then I could add that extra battery power to my tiny camera (Md80) via a usb cable for a much longer run-time. Is this possible? Thanks for any help! Larry

Question by    |  last reply


Increase battery of a portable usb charger?

I have a  portable usb charger that has these specs: Li-ion 3.6V    1200 mAh Input: DC 5V    400 mAh Output: DC 5V    450 mAh Can i add an old battery that has 3.7V and 1150mAh to the charger and increase the battery life of it? Would it be safe to just hook up the the negs to negs and pos to pos? Also what would be a better way to increase battery of the charger without buying a new unit?

Question by yitmat   |  last reply


3 axis stepper controller for PC USB?

Hi all I am trying to get 3 stepper motors connected to a PC and controlled by that PC isung USB, is this at all possible? Carl

Question by modelpilot   |  last reply


Help a newbie- wiring of iphone 3 plug to USB

I have a Sol solar charger for an iPhone 3 that has become unusable do to battery damage.  I want to replace the batteries with one of the many Instructables here.    The Sol uses an output jack that has 6 wires and plugs directy into the iPhone 3.  My question is-can I convert this 6 wire plug to a 4 wire usb plug to then charge the iPhone from this USB port?

Topic by launchteam1   |  last reply


Playstion 3 Hard Drive

I want to combine the PS3's internal hard drive with an external one via USB for more memory, my question is, will this work?

Topic by Caveman477 


Combine 2 (or 3) Joysticks to make one?

Okay I got 3 old Joysticks and lots of games that would be awesome to use DUAL JOYSTICKS. The joysticks use that old Joystick Port. So my question is if there is a way to join them into ONE set and be able to plug it into my computer. And if possible make it into USB?

Topic by itstemo1 


USB Charger Help?

I'm stumped. I built a usb charger with a usb plug in and a battery holder that holds 3 triple a's. I think the output is about 5.10 volts and it charges my flip phone but will not charge my iPhone 4s? Please Help. BTW I am extremely new at electronics. Thanks.

Question by DELETED_MakerNinja   |  last reply


Splicing a micro usb wire with a male 3 jack RCA?

I want to know if its possible to solder these 2 wires together, since there is one on ebay for a yellow and white, but not a red. Or should I just buy the cable?http://www.ebay.co.uk/itm/UK-1-5m-Micro-USB-Male-to-2-RCA-AV-Audio-Video-Adapter-Cable-PVC-Copper-Phone-TV-/142338707287?hash=item21240c4f57:g:TAAAAOSwAANY5anJ

Question by skyblades   |  last reply


how can i power my 3 AAA led flashlight with USB?

I want to power my 3 AAA led flashlight from a usb? thanks.

Question by iamsinned06   |  last reply


Troubleshooting usb powerbank 3 IR LED setup

I am an amateur with setting up circuits, but I am really interested and understand most electronics, I am just confused with the issue I am having. Background:  I am building a wireless google cardboard so that I can play PC games on my phone through the VR headset rather than crappy app games. Basically a wireless Oculus Rift, however I know it wont be anywhere near as good it's just a fun project. I have Infrared LEDs which I will use with freetrack and my modified webcam without IR filter to do my head tracking. Issue: I am trying to power 3x Infrared LEDs from a usb powerpack. Here is the one I am using http://www.ebay.com.au/itm/221468778309?var=520334132263&ssPageName;=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 The reason for using this as a power source is I can easily attach it to the headstraps on the google cardboard, it is just about the smallest power setup I can think of (better than using 3x AA batteries), it was cheap, and it outputs 5v which is perfect for powering 3x IR LEDs with a forward voltage of 1.6v and 60mA current. When I use this powerbank to power a single LED without a resistor and I look at it through my webcam, even with all the lights off and the webcam 5mm away from the LED you can barely see it light up. I tried the led on another powerbank I have here which is 10,000mAh so it is massive, and it was much brighter on the webcam. I then used my samsung TV remote and pressed a button while aiming at the webcam and it was EXTREMELY bright. Basically I want the LED to be as bright as my remote, or as much as the LED is capable of. Why would the powerbank show the LED so dull? I have confirmed it is outputting 5v, but when I try test the current with a 'usb charger doctor' between the charger and usb cable, or a multimeter between the wire and the LED it shows zero current. I should be able to just connect all LED in series with a small resistor and it should just work at full brightness, but the power bank cannot even power a single LED well enough to see properly on the webcam. It's becoming really frustrating, any idea what's happening? Best solution?

Topic by dom.curulli   |  last reply


Ethernet to USB 3.0?

I was looking around this afternoon and found the wonderful 'PCI Express X16 to USB 3.0 adapter' which got me thinking, This could be an awesome way to add a better graphics card to a small computer e.g. a laptop or preferably a Raspberry Pi. Now i know that the Pi doesn't have any USB 3.0 ports but it does have Ethernet (which from past experience is quite a lot faster than USB 2.0) My question to you is this: Is it possible to get a USB 3.0 to Ethernet adapter so that we can have USB 3.0 ports on a Raspberry Pi, and if so would the Pi be fast enough to run an external graphics card connected through a PCI Express to USB 3.0 adapter?

Question by macman808   |  last reply



Need to run 3 USB cameras/microscope simultaneously in one monitor/display?

I have 3 USB cameras/microscope and i need to view all 3 simultaneously in one monitor/display, is there a software or usb splitter that i can use.?

Question by chepeuno   |  last reply


how to recharge my led flash light using 3 AAA battery from a usb laptop?

I have a led flashlight using 3 AAA rechargeable batteries. i want to make it to be able to plug in to my laptop's USB so that i can charge with my laptop.

Question by iamsinned06   |  last reply


Will a 5V 300mA USB device run safely off of 3 AA Batteries?

I'm trying to make a 5V 300mA USB device portable, but I don't know how to measure/calculate milliamps for anything. What's the mA on 3AA Batteries? Pretty sure the voltage is 3.5, but please correct me if I'm wrong. Basically: if I chop the USB connector off and wire the device to 3 AA's, will the device operate safely, or will it get damaged?

Question by Azulax   |  last reply


What's the current supply of a USB? Answered

I want put 3 LED's and a flashdrive into another container, and have the LED's turn on when plugged in, but I'm not sure how to go about wiring up the LED's. What's the supply current that I should use to find the right resistor? If a poorly made diagram gives you a better idea of what I'm talking about you're in luck! http://i317.photobucket.com/albums/mm395/applesnack/LEDdia.jpg I know USB gives 5 volts, but I don't know about the current. And would any problems arise from three LED's and the drive plugged into one USB?

Question by applesnacks   |  last reply


USB WiFi Antenna Mod

I am working on adding a helical antenna to a cheap USB WiFi adapter.  My question is where do I connect the antenna to existing circuit.  I've attached a closeup picture with three likely points.  My three main questions are: 1) Where to connect the external antenna 2) Do I disconnect the rest of the onboard antenna (my gut says yes) or just add in the new 3) What impedance will the external antenna need to match?  I assume the components between points C&B; and B&A; are for some kind of impedance matching.

Topic by telfon   |  last reply


What kind of stepper motor should I get? - for 3 axis cnc desktop mill

I am currently working on building my first desktop CNC mill, I plan on it being 3 axis and the spindle being a dremel tool. I am searching for stepper motors that will work for my project and would like some suggestions as to what kind/which ones I should buy. I have seen ones from 96-200 steps/rev, does this make a large difference which end of the spectrum I use? I figure the more steps,the more accurate it can be but for my basic machine would 96 step/rev be sufficient? aka what kind of accuracy can I expect from 96steps/rev? Should I get bipolar or unipolar? Does it matter if the controller connects through USB or parallel port? is there even a difference Thank you for your time

Question by slayer04   |  last reply


test RJ45Cat5 to USB Female

I'm new to this forum. I need some instructions. I have an RJ45-cat5 male to USB female connector that I bought for 3 bucks. I've tried using it to connect my HP 1050 j410 USB printer to my Linksys WRT54GS (wireless) router so I can have a network printer. (The Desktop is directly wired to the cable modem and the to the router.) It doesn't work, but I don't know if it's the connector itself, or that the printer will not communicate with the router, directly. Is there a way to test the connector with another piece of hardware to determine whether the connector is actually any good? BTW.. I can't determine from HP, whether the 1050 j410 USB printer can become a network printer. Should I just go buy a USB print server for 20 bucks, or whatever? I'm using an Ubuntu 10.04 LTS Desktop with AMD-64 processor. Thanks to you for the best advice. Shobuz99

Topic by shobuz99   |  last reply


power single LEDs with USB?

I'm wanting to use some single 0603 LEDs here and there for a display.  I want each light to have its own power plug.  I'm figuring usb cables are a good way to do this (since I can power them by plugging into a hub, and retractable usb cables are cheap and handy).  If anybody has a better solution, I'm open to ideas. My question is whether there's some way to use a single resistor with the hub, instead of needing to add a resistor to each usb cable?  I'm assuming no, but figured it doesn't hurt to ask. Also, do I need different resistors depending on if it's usb, usb 2, or usb 3 hub/cables? And finally, since I'm getting my 0603 LEDs from some pre-wired Christmas light strands (mostly white, but a few colored), I don't have exact specs.  Is there a general standard that I should use for calculating which resistor to use?  3volts and 20mA sound good?

Topic by aliasjanedoe   |  last reply


Too much voltage for dc USB boosting converter ?

I have a 6v rated solar panel but am also using 3 rechargeable aa batteries, 3.6 volts. My USB boosting converter is rated for 3v-5v input and obviously outputs 5v. Would the 6v solar panel damage the boosting converter if it were to output 6v? thanks!

Question by Stevemills04   |  last reply


how to add usb port to this flash ligt?

Ive got this flashlight. my questions are? 1. how can i add usb port to this flash light? 2. it got 3 AAA battery and i used rechargeable. how do i be able to recharge the battery using usb? 3. what is this flash light? a led? lumen? laser? never those backgrounds... ;)

Question by iamsinned06   |  last reply


Help identifying/replacing component

I'm trying to repair an iMac (Flat Panel) that has non-functioning USB ports. I've narrowed it down to this component, but can find no specs on it. I'm assuming it's an temperature/current protection component and appears to be in parallel with unused fuse pads. I'm wondering if I can get away with sticking a 2amp (it drives 3 ports) fuse in there and bypass the component. Any help would be greatly appreciated.

Topic by LasVegas   |  last reply


Soldering a TRS to TRS cable?

I am trying to make a transfer cable for my TI-84 Plus Silver Edition Calculator. It came with a USB-mini to USB-mini cable, but it has two ports on top. One for a USB-mini cable, and one for an I/O cable, with 3/32 TRS jacks (2.5mm) from Radio Shack. I am wondering how to connect two TRS jacks together to make a transfer cable. I don't know what kind of wire to use, or how the wires should be connected.

Question by Pettrocity   |  last reply



Using and charging at the same time?

Here is what i am trying to archive: 3 LED's to run off a small rechargeable battery or USB. It should also run off USB while recharging the battery.  Lake a wireless headset.  Thanks.

Topic by Squashie   |  last reply


Powerbank has 3 USB outputs 2x2.1A and 1x1A all 3 are 5v, Can I power a small audio amplifier with these connected...?

Hey  Powerbank has 3 USB outputs 2x 2.1A and 1x1A all 3 are 5v, Can I power a small audio amplifier with these connected in series, or would they all need to have the same amount of amps? I currently run the audio amplifier off of 2x9V PP3 batteries, but these run out of charge too quickly and I'm am trying to see if I can run the amplifier off of a 50,000 mAh portable powerbank? I also have another powerbank with 2 USB outputs 1 x 1A and 1 x 2.1A (both at 5 volts) should I just run the amplifier off of the 2 x 2.1A outputs and the 1 x 2.1A output of both powerbanks connected in series, or is it fine to connect all three with the power bank that has the 3 USB outputs (50,000 mAh)? Thanks in advance

Question by MrShauny   |  last reply


Is a toggle switch necessary for this USB Solar Charger? Answered

Hi all! I am a newbie with a simple question. In the instructable below, is the toggle switch necessary or just a design feature? I thought the circuit would only be complete once the USB device is plugged in, acting as the switch so to speak? It is a 6V solar panel to 3 AA rechargeable batteries, then to a DC boosting converter with a 5V USB output. Also, a big thanks to Joshua Zimmerman. Love your instructables! www.instructables.com/id/Solar-USB-Charger-20-21/?ALLSTEPS

Question by Stevemills04   |  last reply


I have a laptop equipped with two usb 2 and two usb 3 ports. The 2 ports work fine but the 3 ports have a problem? Answered

The usb 3.0 ports don't seem to work. The have power and if I plug a simple device like a light or fan in to them it will work but if I plug in a mouse, flash drive, or anything else that works with the computer rather than just draw power it doesn't work. Unfortunately I don't have any usb 3.0 devices to experiment with. I have no Idea how to start narrowing down the problem so some guidance would be greatly appreciated. If you need more information tell me what you need and I will try to provide as timely as possible.

Question by Shadow13!   |  last reply


Does anybody know a tiny MCU for PWM and USB Connection?

I need a microcontroller with 3 PWM pins, for an RGB LED. I also need to connect it to a computer using USB. I`ve seen the attiny2313 has enough PWM pins for this, but is quite big. As I understand, the attiny 25 has just 2 PWM channels. Does the attiny24(or 44 or 84) have enough pins for USB Serial comunication and 3 PWM pins?

Question by flixer   |  last reply


Make thrustmaster top gun fox 2 pro usb work?

I have an old thrustmaster top gun fox 2 pro usb joystick that i got from a thrift store. I am using a windows 8.1 pro 64-bit computer and it doesn't detect the stick when i plug it in even after installing thrustmaster's drivers. It is a usb 1.1 stick and i have usb 2.0 and 3.0 ports on the computer. i have taken the stick apart and looked inside to see if there was any damage and there was none as far as I can tell. the drivers for it are only for xp but I would really like to use it on my windows 8 machine so I can play FSX with rudder controls and a few extra buttons. thanks!

Question by tvsamuel   |  last reply


laptop usb doesn't work anymore.? Answered

My friend has an Asus x52j laptop with win7 on it. Yesterday he shut it down and removed his  external mouse just before the power went out. when he put the power back on, the system checked the disk integrity on all his 3 hard drives, then rebooted, and then he tried to log on but there was no mouse cursor on the screen and the  keyboard did not work. any suggestions? also this is the only computer he has access to.

Question by didgitalpunk   |  last reply


What is the best way to power a usb device with 2 batteries?

My project is to make a walking stick with a tesla ball at the top.  I wish to power a plasma ball ( like this one http://www.amazon.com/USB-Plasma-Ball/dp/B0052GSQ8A ) with just two batteries. The whole minty usb charger seems like overkill and meant for smartphones. This is a simple device that runs on 5v and 350ma. But I could not find any instructables anywhere for this.  I do not mind using 3 or 4 batteries if need be. Any link or suggestion would be greatly appreciated.  Thank you in advanced. 

Question by d3icidal   |  last reply


USB-bus-communication with pic18f4550

Hi everbody Im memo Can you help me please? I'm working on a project about USB Communication with PIC Microcontroller(pic18f4550) I wrote the project in mikroC for pic pro v6.6.1 and this is : nusigned char readbuff[64] absolute 0x500; // Buffers should be in USB RAM, please consult datasheet unsigned char writebuff[64] absolute 0x540; char cnt; char kk; void interrupt(){ USB_Interrupt_Proc(); // USB servicing is done inside the interrupt } void main(void){ ADCON1 |= 0x0F; // Configure all ports with analog function as digital CMCON |= 7; // Disable comparators HID_Enable(&readbuff;,&writebuff;); // Enable HID communication while(1){ /*while(!HID_Read())*/ ; for(cnt=0;cnt<64;cnt++) /*writebuff[cnt]=readbuff[cnt];*/ while(!HID_Write(&writebuff;,64)) ; } } and this the USB Descriptor : USBdes.c : const unsigned int USB_VENDOR_ID = 0x1234; const unsigned int USB_PRODUCT_ID = 0x0001; const char USB_SELF_POWER = 0x80; // Self powered 0xC0, 0x80 bus powered const char USB_MAX_POWER = 50; // Bus power required in units of 2 mA const char HID_INPUT_REPORT_BYTES = 64; const char HID_OUTPUT_REPORT_BYTES = 64; const char USB_TRANSFER_TYPE = 0x03; //0x03 Interrupt const char EP_IN_INTERVAL = 1; const char EP_OUT_INTERVAL = 1; const char USB_INTERRUPT = 1; const char USB_HID_EP = 1; const char USB_HID_RPT_SIZE = 33; /* Device Descriptor */ const struct { char bLength; // bLength - Descriptor size in bytes (12h) char bDescriptorType; // bDescriptorType - The constant DEVICE (01h) unsigned int bcdUSB; // bcdUSB - USB specification release number (BCD) char bDeviceClass; // bDeviceClass - Class Code char bDeviceSubClass; // bDeviceSubClass - Subclass code char bDeviceProtocol; // bDeviceProtocol - Protocol code char bMaxPacketSize0; // bMaxPacketSize0 - Maximum packet size for endpoint 0 unsigned int idVendor; // idVendor - Vendor ID unsigned int idProduct; // idProduct - Product ID unsigned int bcdDevice; // bcdDevice - Device release number (BCD) char iManufacturer; // iManufacturer - Index of string descriptor for the manufacturer char iProduct; // iProduct - Index of string descriptor for the product. char iSerialNumber; // iSerialNumber - Index of string descriptor for the serial number. char bNumConfigurations; // bNumConfigurations - Number of possible configurations } device_dsc = { 0x12, // bLength 0x01, // bDescriptorType 0x0200, // bcdUSB 0x00, // bDeviceClass 0x00, // bDeviceSubClass 0x00, // bDeviceProtocol 8, // bMaxPacketSize0 USB_VENDOR_ID, // idVendor USB_PRODUCT_ID, // idProduct 0x0001, // bcdDevice 0x01, // iManufacturer 0x02, // iProduct 0x00, // iSerialNumber 0x01 // bNumConfigurations }; /* Configuration 1 Descriptor */ const char configDescriptor1[]= { // Configuration Descriptor 0x09, // bLength - Descriptor size in bytes 0x02, // bDescriptorType - The constant CONFIGURATION (02h) 0x29,0x00, // wTotalLength - The number of bytes in the configuration descriptor and all of its subordinate descriptors 1, // bNumInterfaces - Number of interfaces in the configuration 1, // bConfigurationValue - Identifier for Set Configuration and Get Configuration requests 0, // iConfiguration - Index of string descriptor for the configuration USB_SELF_POWER, // bmAttributes - Self/bus power and remote wakeup settings USB_MAX_POWER, // bMaxPower - Bus power required in units of 2 mA // Interface Descriptor 0x09, // bLength - Descriptor size in bytes (09h) 0x04, // bDescriptorType - The constant Interface (04h) 0, // bInterfaceNumber - Number identifying this interface 0, // bAlternateSetting - A number that identifies a descriptor with alternate settings for this bInterfaceNumber. 2, // bNumEndpoint - Number of endpoints supported not counting endpoint zero 0x03, // bInterfaceClass - Class code 0, // bInterfaceSubclass - Subclass code 0, // bInterfaceProtocol - Protocol code 0, // iInterface - Interface string index // HID Class-Specific Descriptor 0x09, // bLength - Descriptor size in bytes. 0x21, // bDescriptorType - This descriptor's type: 21h to indicate the HID class. 0x01,0x01, // bcdHID - HID specification release number (BCD). 0x00, // bCountryCode - Numeric expression identifying the country for localized hardware (BCD) or 00h. 1, // bNumDescriptors - Number of subordinate report and physical descriptors. 0x22, // bDescriptorType - The type of a class-specific descriptor that follows USB_HID_RPT_SIZE,0x00, // wDescriptorLength - Total length of the descriptor identified above. // Endpoint Descriptor 0x07, // bLength - Descriptor size in bytes (07h) 0x05, // bDescriptorType - The constant Endpoint (05h) USB_HID_EP | 0x80, // bEndpointAddress - Endpoint number and direction USB_TRANSFER_TYPE, // bmAttributes - Transfer type and supplementary information 0x40,0x00, // wMaxPacketSize - Maximum packet size supported EP_IN_INTERVAL, // bInterval - Service interval or NAK rate // Endpoint Descriptor 0x07, // bLength - Descriptor size in bytes (07h) 0x05, // bDescriptorType - The constant Endpoint (05h) USB_HID_EP, // bEndpointAddress - Endpoint number and direction USB_TRANSFER_TYPE, // bmAttributes - Transfer type and supplementary information 0x40,0x00, // wMaxPacketSize - Maximum packet size supported EP_OUT_INTERVAL // bInterval - Service interval or NAK rate }; const struct { char report[USB_HID_RPT_SIZE]; }hid_rpt_desc = { {0x06, 0x00, 0xFF, // Usage Page = 0xFF00 (Vendor Defined Page 1) 0x09, 0x01, // Usage (Vendor Usage 1) 0xA1, 0x01, // Collection (Application) // Input report 0x19, 0x01, // Usage Minimum 0x29, 0x40, // Usage Maximum 0x15, 0x00, // Logical Minimum (data bytes in the report may have minimum value = 0x00) 0x26, 0xFF, 0x00, // Logical Maximum (data bytes in the report may have maximum value = 0x00FF = unsigned 255) 0x75, 0x08, // Report Size: 8-bit field size 0x95, HID_INPUT_REPORT_BYTES,// Report Count 0x81, 0x02, // Input (Data, Array, Abs) // Output report 0x19, 0x01, // Usage Minimum 0x29, 0x40, // Usage Maximum 0x75, 0x08, // Report Size: 8-bit field size 0x95, HID_OUTPUT_REPORT_BYTES,// Report Count 0x91, 0x02, // Output (Data, Array, Abs) 0xC0} // End Collection }; //Language code string descriptor const struct { char bLength; char bDscType; unsigned int string[1]; } strd1 = { 4, 0x03, {0x0409} }; //Manufacturer string descriptor const struct{ char bLength; char bDscType; unsigned int string[16]; }strd2={ 34, 0x03, {'M','i','k','r','o','e','l','e','k','t','r','o','n','i','k','a'} }; const struct{ char bLength; char bDscType; unsigned int string[15]; }strd3={ 32, //sizeof this descriptor string 0x03, {'U','S','B',' ','H','I','D',' ','L','i','b','r','a','r','y'} }; //Array of configuration descriptors const char* USB_config_dsc_ptr[1]; //Array of string descriptors const char* USB_string_dsc_ptr[3]; void USB_Init_Desc(){ USB_config_dsc_ptr[0] = &configDescriptor1; USB_string_dsc_ptr[0] = (const char*)&strd1; USB_string_dsc_ptr[1] = (const char*)&strd2; USB_string_dsc_ptr[2] = (const char*)&strd3; } the problem is thas when I build the project this message is shown 434 Demo Limit 102 Finished(With errors) How I Can Solve how this problem please?

Topic by MohamadK4   |  last reply


is there a way to transform a 3x AAA cell powered device into usb?

Is there a way to power up a device that uses 3 AAA batteries into a hybrid usb and/or cell powered device?

Question by    |  last reply


How to fix card reader? Answered

I have this card reader and the computer recognize it but it doesn't recognize the card. I connected it to 3 different computers and the same story to all of them. The card works fine.

Question by theVader75   |  last reply


Can usb ports share a ground?

Im converting an old printer (25 pin) switchbox into a switchbox that will be used for my monitor, speakers, keyboard, mouse and two computers. The problem is that the monitor has 15 pins, the speaker has 3 pins, and the two usb ports have 4 pins each meaning that I would need 26 pins rather that 25. I could just solder the left and right speaker pins together and make those two 1 pin, but i would rather not have to do that. My question is can two usb ports share a ground pin, meaning that it would only need 7 pins rather than 8.

Question by danielemur   |  last reply


Sound from computer TO midi w/ speakers?

I picked up guitar again, and found that my MIDI keyboard has a good set of speakers. I have a MIDI to USB cable currently, as well as some 1/4" and 3.5 mm jack cables. The ports on the back of the keyboard are Sustain, Headphones in,  Midi In/Out, and power supply. Computer has USB of course, mic in, and headphone out. This is my last resort, as there are no other good speakers that I can use. I want the sound live if possible, too. I'm totally stumped. Even vague answers will help.

Question by Fenderpony   |  last reply


diy car radio / bluetooth / usb

Hi guys, I was hoping for some guidance. I have an 1995 audi a4 and the 1 din cd/radio player  you see is kind of outdated. I was looking for a replacement unit that is simple, clean looking and has Bluetooth / USB connectivity. Didn't find any and in case I did find something it looked ugly or had bulky buttons or tasteless lights glowing all over the place. So I thought maybe a raspberry pi could replace the current unit but this brings up a whole s*itload of  problems. 1. Is there a way to power the pi with the power cable that powers the current unit? Are there any converter cables? 2. Currently as you can see there are 4 rca cables in use. 2 front and 2 for the back. The latter go trough an amp in the trunk. I stumbled into a small board with two rca ports for the pi. Can I use a splitter and plug in all 4 cables to that? As you can tell already by now, electricity, current, amps and all that is not my slice of pie :P 3. If we could sort these out as a first step we could move onto adding a power on / off sort of thing so the pi doesn't  drain the car's battery when not in use? Maybe add a touchscreen later on. Print a case for it and hack it into the car's console somehow, but these later ones I could sort out on my own. The foundation tho'  would be the first 3 questions. Thank you in advance for your feedback. Much obliged and much appreciated! Cheers!

Topic by dtbsz 


Does the new XInput code for the USB Host Shield support the Logitech F710?

I would like to get a USB Host Shield, but, for gamepads, it might not be a perfect idea to get a DualShock 3. Has anyone tried the F710 with the new XInput code?

Question by VirtualBoxer   |  last reply


does the negative or positive cable from a power source go to pin 1 on a 5v regulator? Answered

I am working on a solar usb charger and everything i have read about 5v regulators says to connect the positive cable to pin 1 and the positive of the usb to pin 3.  this doesnt seem right because th voltage wouldnt actually be taken down would it. I feel like the negative ends should be connected to the pins. am i right?

Question by gantyman   |  last reply


4.5 volt led desk lamp to usb port? Answered

Can a 4.5 volt 3 aaa batery led desk lamp be powered from a usb port? Does the .5 volts make any difference?

Question by sctirvn687   |  last reply


connect my usb webcam to my tv wireless?

I have a usb webcam and i need to connect it to my tv wirelessly through usb to rca cable as i am making my cctv camera. please help.also my tv is not a smart tv. it is a sony trinitron tv .

Question by mano.lingam.3   |  last reply


How do I convert a 3V battery powered device to be USB powered instead? Answered

I saw another article about this, but his device had 3 batteries.  My device has 2 AA batteries. I don't know anything about how a circuit works, but I can follow a schematic.  What do I need to do to change the output from the USB of 5V to only provide 3V for my device? I find a lot of articles about converting 12V to 5V, but I'm not sure how to translate those schematics into something that will go 5V -> 3V.

Question by amoebaman17   |  last reply