Build a embedded RFID card system device for payment transactions - PCB design, software & Product design

Multiple devices will be used in one setup (1 to +100 devices). They authenticate to the network and receive a unique ID.

Use of esp32 or another uc for wifi connection to central server.

Creation of server software api to communicate with all devices. API talks to an existing MSSQL database with all information about pricing, customers, ...

Need to register new devices. This will assign an id to it and define the pricing that it should use for the transactions.

Prices that a device is using are centrally managed and can be changed. This information is sent from the server to the device.

Users can use an rfid card to pay and to start a transaction. (using relais output or serial communication)

The card stores the amount of money that still can be used.

With every transaction, the amount is updated on the card and will sync to the central MSSQL database on the server.

If the device was unable to send the transaction to the server, it will store the transaction on the card for later synchronisation

State information about the transaction is displayed on an lcd

We want to have as much logging as possible about all the transactions going on. For this reason, devices send log information to the server. If they are not able to do this, logs will be stored locally in flash (with log rotation in case flash gets full) for later upload.

Devices register transaction and log data with the correct time information. For this reason, devices are able to sync their internal clock with the server.

Possibility to fix issues in the firmware and optionally add new features in the future without having to remove the microcontroller from every device. For this reason, devices support over-the-air upgrades.

RFID cards are formatted Mifare cards with changed keys. Cards are preformatted and a unique ID is stored so no other cards can be used.

Money will be added to the cards using an external payment device (money stored on card and in MSSQL customers table ) - this is not part of this job

Квалификация: 3D-дизайн, Программирование на С, Встроенное ПО, Микроконтроллер, Разводка печатной платы

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О работодателе:
( 5 отзыв(-а, -ов) ) AALTER, Belgium

ID проекта: #16353135

15 фрилансеров(-а) в среднем готовы выполнить эту работу за €2845


Hi I am experienced embedded system designs. Please have a look at my profile I assure you quality work and on time delivery please get in touch to discuss it further Regards

€3000 EUR за 30 дней(-я)
(171 отзывов(-а))

Dear Sir, I am an highly skilled board designer who has over 17 years experience on complex PCB design. I can provide you design service from schematics entry to PCB layout. I can also provide the prototype service. Больше

€2500 EUR за 30 дней(-я)
(101 отзывов(-а))

HI, About the Project : We worked with ESP Wifi Modules and RFID readers before . we have done indrustrial systems that use the same wifi module and connect to a single network ( over 200 Devices ) Can we talk Больше

€2647 EUR за 30 дней(-я)
(32 отзывов(-а))

Dear Sir! I'm very interesting in your job. Actually, before i already many worked on electronic device development and i have a large experience in this area. Please feel free to check my portfolio. I have a high Больше

€2500 EUR за 30 дней(-я)
(23 отзывов(-а))

Hi there, I am electrical engineer with 18 year experience , I have worked with several types of payment gateways and systems from year 2000 including rfid based, just the controller won't solve the problems. Kindl Больше

€2666 EUR за 30 дней(-я)
(14 отзывов(-а))

Hi, I am a post graduate power electronics engineer and having very good experience in product design and development. I am excellent in embedded design & programming using pic, dspic controllers and MATLAB codding fo Больше

€5555 EUR за 100 дней(-я)
(25 отзывов(-а))

Hello, Have a great day. We will take care of full product development of product. Please feel free to contact us. Best Regards, I-TECH team.

€3000 EUR за 30 дней(-я)
(28 отзывов(-а))

I am an electronic engineer with more than 10 years of experience. I work with a team of engineers and we have worked on complete product developments before. I can work on this and provide you with a prototype. Other Больше

€2000 EUR за 50 дней(-я)
(13 отзывов(-а))

Thanks, I read the description and I want to offer you my services. You can check my past simular works here [login to view URL] and here https://www.freelancer.com/u/IvanWOW contact me to discuss this projectuI Will be very Больше

€3970 EUR за 29 дней(-я)
(17 отзывов(-а))

Hi sir, We already done very similar project in which we designed the mesh network based on ESP32. we have read your project and we can do it for you. We can give you very good solution for your project. Le Больше

€1500 EUR за 22 дней(-я)
(33 отзывов(-а))

We are a team of experts with more than 15 years of experience in the field of embedded systems, electronics, prototyping and PCB layouts. I assure you the best solution for your work. Regards Ch

€2500 EUR за 30 дней(-я)
(46 отзывов(-а))
€2500 EUR за 10 дней(-я)
(5 отзывов(-а))

We are a team of engineers having expertise on embedded domain. We have worked on several embedded linux/android SBC like AM335x-sk, Wandboard, Dragon Board, Pi2&Pi3, Beagle Bone Black, C.H.I.P, Orange-Pi-Zero etc as w Больше

€3333 EUR за 30 дней(-я)
(5 отзывов(-а))

Click on that__CHAT__button below so that I can ask a few questions concerning the project. I have read all the provided instructions and I am the right person to work on RFID task

€2500 EUR за 30 дней(-я)
(1 отзыв)
€2500 EUR за 30 дней(-я)
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