Arduino NFC trigger? Answered

Hi, I'm making an Arduino powered NFC trigger? I want to control it from my phone. As soon as I switch my phones NFC ON, the Arduino should get triggered. I'm aware that the circuit will contain an Arduino board, a nfc shield , relay. But I need to do this on a budget. So i need to know which is the cheapest Arduino capable of doing this. Also if someone could help with the code. I'm pretty good in electronics. But just started learning the Arduino. Basically heres how it should work. Switch on NFC on smartphone. Go near circuit(Arduino-NFC-trigger) NFC sheild gets activated. This gives input to arduino, Arduino gives output to any output pin. After sometime output stops.

Question by Jonathanrjpereira 4 years ago  |  last reply 4 years ago

Board with NFC and WiFi

I'm looking for a board (for the moment a development board would be the best solution as I am prototyping) with NFC and WiFi integrated. I saw that Arduino should launch one with NFC, Wifi and Bluetooth, the board is called Primo. I can't find anything else and Arduino can't announced a date for the launch. For now I'm working with a NFC reader and the Arduino WiFi Board both mounted on a separate Arduino Uno because the two boards are incompatible. Any idea ? Thanks Alizée

Topic by AlizéeG 2 years ago  |  last reply 2 years ago

Can you turn a NFC tag off? Answered

Seemingly stupid question, but I would like to know if there is some way to turn an NFC tag off. Basically, I'm helping a friend with a game of lazer tag he's trying to throw together with some scrap parts, and one of the ideas was a health pack. To try and balance things, we want the health pack to only work X amount of times, with a Y cooldown between uses. My original thought for this is to just stick a micro-controller inside the health pack that would control a NFC tag that can be turned off an on per parameters set on the controller. The person wanting to use the pack would just pick it up, and stick it to there chest to use it. Once used, the tag goes off for the cooldown.  Alternately, if there was some way to re-write the tag from an arduino or similar platform, that would work just as well (maybe even better!) thanks in advance! 

Question by DoctorWoo 4 years ago  |  last reply 4 years ago

How to reprogram this NFC reader?

So I've got this NFC mobile banking from work (we've shut down the system because of lack of users) and we were left with a few hundred of these "read-write" NFC things. As you can see from the photos they have 2 SIM-card holders (probably that is the way they were connecting to the network) 2 USB mini ports, a RGB screen, a small speaker, and the board which is made of 2 easily disconnected parts. If I try to connect it to my PC it gets stuck on "Time and date set" and after a minute it writes a "Failed" on the screen. What i want to do is to make it able to read/write NFC chips and to display text on the display. Please help me because I have no idea hot to do this. 

Question by mkeranov 3 years ago  |  last reply 3 years ago

RFID/NFC computer lock?

I am curious if any of you have an idea for something that could detect a bracelet from 5-10 feet and when it leaves, issue a sleep command to a computer.  I think it would be relatively easy to issue the command from an arduino, but I'm not very sure on which tags and readers to use for the right range.  The idea would be for the computer to automatically sleep/lock when you leave the room.  So what frequencies/types of tags and readers should I look into that will offer a decent range, that is close enough not to loose connection reaching across the desk or walking a few feet across the room, but won't work from a few rooms down the hall, and will interface well with an arduino.

Question by seedorfj 4 years ago  |  last reply 4 years ago

RFID questions

I am wanting to create a fun RFID / NFC device that will detect when different people walk into a room. We all have individual RFID door tags to open a door so I was wondering what the range was on RFID, would the person need to tap their fob or is RFID strong enough to detect if somebody is just carrying the fob in their pocket? If the RFID isn't strong enough, could I use something in their phone to detect them? Bluetooth maybe? Everybody has an iPhone, could I detect something on that? Any thoughts? Thanks. Phil

Topic by filthyPhil 4 years ago  |  last reply 4 years ago

Arduino not communicating with CR95HF properly

I'm building an NFC reader/writer with Arduino Uno, Arduino click board and RFid click on ( ). The click on board has a microcontroller called CR95HF ( ).  In order to make this work, i have to communicate through SPI. But I got the feeling it's not properly done.  I keep sending data in the way I believe is right (because all found examples do it this way and the datasheet says so),  yet I keep getting either 0 or 255 (when I move or touch the board).  Mostly I've tried to send and receive the ECHO, but nothing seems to work.  I'm starting to run out of ideas. If anyone please would like to help, it would be greatly appreciated.  (my code is included in the attachment). PS: this is an example that uses the same microcontroller on a different version of the RFid click board. 

Topic by EvelineV 3 years ago  |  last reply 3 years ago

How can I make an app to control a Xbee? Answered

I want to know if there is a method for me to make an android app that can control a Xbee, Or is there any Xbee app maker. I basically want my smartphone to control the Xbee.

Question by Jonathanrjpereira 4 years ago  |  last reply 2 years ago

Help coming up with how to make robotics project (RFID/iButtons/sensors/chess/microcontrollers)? Answered

Hi all! :3 For my 2-year high-school robotics project (last two years of High School) we were allowed the freedom to choose whatever project we felt like working on, as long as it got approved by the teacher. Me, being a huge fan of chess, decided to make a chess-related project. Unfortunately, I dashed into it without giving it much thought. So I'm here asking you guys if you can think up of a way for me to achieve this. Afterwards I'd like to take it a step further and have it not be related to chess at all, and make my own board game with my own rules, but that's afterwards. Alright, I'm really bad at explaining things (English = not my native language), but here goes. I'd like to make an interactive chess board. The chess board would be grid-based, obviously, with possibly LEDs inside each square. I'd also have my 16 (or well, 32) chess pieces that would all be custom made. (I have access to any materials I need, so don't worry; I have a big budget, 3d printers, plenty of microcomputers and microcontrollers, you know. All I need to know is what to get X'D) Now let's say I place/take off a piece on the board. I'd want the grid to light up the corresponding squares/blocks. E.G: I pick up a pawn, and the square right in front of it lights up. So You understand what I mean? If possible there could be some button on the chess piece. Heck, it doesn't have to be a chess piece, as the shape would make it weird. I can just have blocks with a button on top and a little sticker indicating what piece it is. Anything like that works. I'm guessing the board would have some kind of microcontroller/microcomputer integrated into it that would process the logic for the lights/movements. The part that really gets me most is how it will know what chess piece it is and how I would go about implementing the code and such. If you had to make this, and had 2 years time, how would you make it? What kind of materials would you use? I've been doing a bit of research on this, and through my research it seems like using Arduino or something of the like along with iButtons or some sort of RFID/NFC would be ideal. I don't want to do anything optical, like utilizing cameras, etc. I'd like each piece to store memory and information related to it and for it to be able to be read and written by the board (well, the microcontroller/microcomputer). Again, I don't have that much expertise with anything related to radio frequencies, or a lot of the part of the hardware-side of the project, I'm more of a software-buff. But I really want to learn which is why I'm doing this! I have a bit over a year's experience in C++ and Java, since that's most likely going to be required. Anything helps! Thank you so much for your help! :')

Question by h4n4t0 4 years ago  |  last reply 4 years ago

Anyone have any interest or experience with proximity based BLE iBeacons/Sensors?

Hi All, I'm semi-tech. & new to the community but figured I'd reach out, so please bear with me as I describe the following ask.Since last yr. I've been on the hunt for a small iOT sensor that based upon close proximity can be identified & actived via BLE without an attached app. Thought an Eddystone may work but purchased a few nRF51822 semiconductors but haven't tested them as yet & not sure if it's even the proper solution. I would need to program this beacon/sensor to launch a website, video on nearby cellphones. NFC works perfect but is extremely limited to only a 5cm range & requires an NFC capable device.I was told to try: "Perhaps the Raspberry Pi 3 Model B+ could work since it supports BLE and also has WiFi: "But I'll need something much smaller [see attached] & less costly per unit. I'm envisioning something no larger than a quarter & powered possibly by a watch battery. Do you think the nrf would suffice?Any suggestions I'm super open as well as just ideation. Thx in advance.

Topic by AxelFoley77 8 weeks ago

Can someone help me with the (electrical) design of my bluetooth speaker? And also, how can I remove speaker shielding?

Hello everyone, I would like to build my first Bluetooth speaker but I like some challenge since I study Electrical Engineering. That's why I looked up a lot of different designs and combined mostly these two: from Greatscottlab and that of Barry_L. I'm pretty sure my design will work, however I still like to have some advice on how to improve it. For example, I'm not sure if it's a good idea to connect a capacitor like the Barry_L design, because if I switch between the 3.5 mm input and the bluetooth board, the cap still contains energy which can only be discharged with a resistor. But how big of a capacitor can I use or is necessarry to achieve a good bass? I calculated that in order to make the capacitor effectively discharged in 1 s that I need a resistor of 3.125 kOhm at least. But this only applies to the bluetooth module and not to the 3.5 mm jack amp. These are the electrical components that matter most to this question: Power Indicator Protection Board  Bluetooth Module  PAM8406 Step up module  (I'm also planning to add a NFC tag and two passive radiators) Secondly I sort of have a problem with my speakers, the units are magnetically shielded. I found out that this is done so there is no interference with crt screens. This makes the speakers pretty heavy and also large. Do any of you know how to remove this shielding or a better place to find a way how? (google didn't serve me well) Btw, I didn't got a response from one of the authors of the projects, so I think here might be a better place for advice.

Question by Jeremyv30 2 years ago  |  last reply 2 years ago