donderdag 14 mei 2020

Dual frequency RFID reader -2-

To test my dual frequency RFID reader added some Dupont connectors on the other side of the provided cable.
To make easy changes i decided to add one pin connectors to all the wires. All cables have different colors, however i also wanted to put them quick in the same order as on the connector. So i put all the wires in the right order through an 8 pin Dupont housing. The plastic 8 pin housing can be put on any position as it can move free and is only for quick putting the wires in the right order.
(In fact it is a complete Dupont housing, i did cut of a small part of the housing where the holes for the wires are smaller.)
Hope this little hack will prevent mixing up the wires.
I already did a quick test of the Led with a small 1.5V coin cell. When putting the 1.5V coin cell directly on the leads of the led it lights up. Connecting 1.5V to combinations of wires like VCC (Red),  LED (Orange) and GND (Black) did not light the led.
A next step will be testing the RFID sensors, the led and buzzer. For the final part i need to decide if i will use an Arduino or an ESP module and where exactly i want to place this reader.

dinsdag 12 mei 2020

Dual frequency RFID reader -1-

For RFID experiments i also have a cheap dual frequency RFID reader with enclosure from my old mailbag. Bottom side of the enclosure is open. The size is about 7,5cm * 11,5 cm. A resin protects the components and a connector with wires (30 cm) is included.
It contains not only a 25Khz and 13.56MHZ  RFID reader. Also a led and buzzer is inside this enclosure.
For the RC522 RDIF reader there are several examples on the internet. For this reader i did not yet find much instructions. Also i and did not yet test the module.

Website of manufacturer ( Chinese)
https://gwiot.com/

Website with use example (Only RFID not using buzzer or led test)
https://smartpoker.jimdofree.com/modules-rfid/lecteur-rfid-7304d2/
The page contains links for code and more info to


Additional info on this page
https://world.taobao.com/item/45234761820.htm
Google translation of some text on this page about temperature sensibility
Special Note
     1. If the product with a temperature resistance of 60 degrees is placed in the gate, the direct sunlight at noon in summer will seriously affect the IC card reading function. The product with a temperature resistance of 80 degrees can work stably.
     2. The sensitivity of card swiping of temperature-resistant 80-degree products is higher than that of 60-degree products.
     3. It is recommended to use the pedestrian gate only, which has good adaptability to the metal environment.
    4. The default stock color of the product is carbon black. If you need white, please communicate with customer service if there is stock.
  5. The temperature-resistant 60-degree dual-frequency read head has been discontinued and needs to be ordered.
Due to the (poor translated) text above i expect better to keep the module out of direct sunlight if possible.

According the internet the following cards can be used:

 13.56MHZ /
 ISO14443 TYPE A

  1. NXP_Mifare1k
  2. NXP_Mifare4k
  3. NXP_Mifare mini
  4. Ultralight (C)
  5. Mifare  PlusX(S)
  6. Desfire  D21  D41  D81 
  7. NTAG203(F)
 125KHZ
  1. EM4100
  2. EM4200
  3. JT120 (??)

A Chinese mini manual was included when delivered from AliExpress. In this first post about this module only some info, pictures and a first try to translate the manual using google translate. Hope it will be soon possible to make a next post about this module with some results.

donderdag 7 mei 2020

COVID-19 data -5-

Short post on my blog to share a link to Github files containing Dutch Covid-19 data.
Not tested  / full checked however looks reliable and up to date ( 7/7/2020)

https://github.com/J535D165/CoronaWatchNL
COVID-19 disease count cases in The Netherlands by RIVM, LCPS and NICE

zaterdag 28 maart 2020

COVID-19 data -3-


Update

The filenames of Novel Coronavirus (COVID-19) Cases, provided by JHU CSSE on Github ( https://github.com/CSSEGISandData/COVID-19 ) as posted in my first blog post are changed. The csv files (on 28 March 2020) are:

https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_global.csv

https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_deaths_global.csv

https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_recovered_global.csv

Therefore i needed to adapt my Google spreadsheet.
As now also data from oversea parts of The Netherlands ( Aruba, Curacao, Sint Maarten) are in the Johns Hopkins University Center for Systems Science and Engineering (JHU CSSE) overview became available i also needed to do some additional updates.

dinsdag 17 maart 2020

Keyboard with Leds for Arduino



4X4 Matrix Keyboard For Arduino Array Module 16 Key Push Buttons Tastatur Switch Keypad Panel 4*4 Tasten 8LEDs Accessory DIY Kit
This module is advertised for Arduino, however i had plans to use it for FPGA experiments.
Just when i did think i needed to build something like this on a board as there could be a big delay in delivery due to the current situation in the world i received it this AliExpress item in my mailbag.
Small where where included, i just needed to screw them in position.




I did nit yet test it, however it seems an interesting small and cheap module to add some buttons and led's to projects or for development.

  • 16 keys in a 4*4 matrix
  • 4 keys connected to ground and with 1k resistors to VCC
  • 8 leds with 1k resistors and connected to VCC



KEY_A

KEY_B
(Photos taken with my phone, Schematic diagrams / circuits copied from AliExpress)
LED

zaterdag 14 maart 2020

FPGA First steps -4- Cyclone IV (photos)

Some more photo's  of my Cyclone IV FPGA board.


donderdag 12 maart 2020

FPGA First steps -3- / Cyclone IV

Update about my FPGA adventures.
I also received my second FPGA experimenting board with a Cyclone IV
The Cyclone II board is a nice development board with a lot of IO pins. To do real experimenting and leaning how to use FPGAs you need to add some additional hardware as the button and led on the board. I did this using a breadboard, some Dupont wires leds resistors and buttons. I also have plans to make a pcbs with some hardware for this board.
The Cyclon IV board has more on board IO. (Displays, buttons, leds, buzzer, dip-switches, video a ps2 keyboard and several pins. Below a photo of my Cyclone IV board in action,
On the left is the USB blaster connected to the board for programming. It is possible to power the FPGA board using the power connector on the topleft. (On the photo below the USB cable of the USB Blaster. I used the alternative method with an USB cable (connector above the 7 segment display).
The software worked when i selected Cyclone IV GX and EP4CE6E22. Also i include a video from my YouTube channel. You see a 4 digit counter. After a few seconds i loaded a new FPGA program / configuration file using the USB Blaster. (the demo program led_test.sof )