Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [card]

22 questions
12
votes
3 answers

Punch a hole into a RFID card (125khz)

So I have this 125khz RFID card and I would like to punch a hole in it so I can have a thin string go through it, making my card to be able to hang from my neck. Though I have no experience in punching hole to any sort of card, not mentioning an…
Programer Beginner
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5
votes
4 answers

Hacking musical birthday cards

I bought a musical birthday card with a small circuit in it hooked up to a piezo speaker. I took the circuit out and realize that it was ridiculously simple (from what I can see). So I was thinking if there is anything I can do to change the song it…
See Jian Shin
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3
votes
1 answer

What is the way to detect SD card insertion/removal?

I am interfacing a 32 GB Micro SD card with a PIC32MX795F512L. I am following the examples provided in Lucio de Jasio book. In one of their example, they are using while( !getCD()); to check if the card is present or not, but this doesn't seem to…
user007
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2
votes
1 answer

What is the maximum height (thickness) per slot for a finished (soldered/populated) PCI express card?

The main question is: Defined by maximum allowable height from the surface of the PCB on both sides (soldered pins and components), or whatever metric experts think would be most useful in decoding an undefined "card height" measurement in inches as…
Rook
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2
votes
2 answers

NO CD pin in SD card module by LC Studio?

I have a SD card module by LC Studio. I am interfacing it with PIC32. This module consist of 6 pins: CS MOSI MISO CLK 3v3 GND I am following Lucio De jasio book to interface SD card. He has described to connect CD pin which is a Card Detect pin to…
Aircraft
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1
vote
2 answers

MOSFET repair 4901 or 4901NF

I'm from Germany and im not so good in English, please forgive me. I have a little bit idea of electronics but I'm not so sure with this problem. I would like to say beforehand that I have a soldering iron and hot air gun, so I can do a clean…
ToastKiste12
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1
vote
0 answers

Will this circuit for two Wiegand card readers allow them to talk to one control board?

I'm working on designing a PCB to allow two Wiegand HID card readers to be connected to a single control board using digital isolation IC's and wanted to make sure the IC's and other components are adequate for the job and if there is anything else…
Seth Koberg
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1
vote
2 answers

SD card initialisation problem with Atmega32u4

I have had this issue for the last couple of days and I cannot solve it. There are many similar issues I've read through online but they have not really worked for me. This project involves a PCB and doesn't use the Arduino type SD card breakout…
Usernamed
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1
vote
2 answers

Error initiating microSD card in SPI mode

I am trying to interface a 32 GB microSD card with PIC32MX795F512L using SPI communication. SPI communication is working fine as I have tested it by shorting the Data Input and Output line and receiving back the data which I sent. I am following the…
user007
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0
votes
0 answers

Need help connecting a speaker to a video card

I have this video card which uses a 4-pin JST connector for the speaker: PL+ PL- PR- PR+ I was using this speaker which has a 4-pin JST connector: What I thought is: One red wire is for the left (wire 1.) one red wire is for the right (wire…
Just doin Gods work
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0
votes
0 answers

Contactless smart card antennas

In a contactless smart card, all the looping of the antennas, where is the sweet spot to get the most energy from the terminal?
Brian Kim
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0
votes
2 answers

I built a locomotive and I want to connect a TSU-2200 sound card to it which operates on 3.7 v to 22 v. my system operates on 24 volts

I have built a locomotive, which operates from a 24-volt alternator through a 300 amp controller then to 6, 350-watt 24-volt motors. I have a TSU-2200 digital sound decoder that operates on a voltage between 3.7-volts-22-volts, the problem is that…
George
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0
votes
0 answers

Can I use a WLAN mini pcie card (half or full height) in USB WiFi/WWAN slot?

I have a mini PC which has an mSATA and a USB WiFi / WWAN slot. Below is a picture with the board and its slots. I want to know if there is a possibility to install a WLAN mini pcie card (half or full height) which supports 5Ghz AC standard into…
cioby23
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0
votes
0 answers

STM32 SD SPI FR_DISK_ERR

Hi I am working on STM32F103c8t6 MCU.I am trying to run sd card with spi wiht this library https://github.com/eziya/STM32_SPI_SDCARD do every thing like youtube video and my connection is like video…
OnlyStar
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0
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1 answer

is it true that whether a POS can read an NFC card, that POS is compatible with HCE?

I was wondering if the host card emulation would produce the same result as an physical contactless card is producing.
Delayer
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