The Use Of Wiegand

Posted on Tue 26th, September 2017

• #1

Alexander

I want to hook the reader Matrix3 want to use the Wiegand Protocol. Is this possible? If to how? Maybe someone has done this before and have an example? Since iButton DS1990A on 1wire is bad.
• #2

allObjects

...a pretty weird protocol... Wiegand Interface Definition and Micro RWD EM4001 “Mag swipe” Decimal Output Version.

Is that what you are talking about?

Seems to be a 500bps protocol... a state-machine in Espruino could implement it with setWatch()'s on two RX connected to the sensor's/reader's TX (and of course two more connections for the communication in the other direction).

I'm though not sure that ESP8266 has the capacity and the option to serve that state machine, because of the Wifi demands (interrupt requests) which come first (are of higher priority and are served first). - I read somewhere that you have about 15ms for a piece of event driven JavaScript to execute... if it takes longer, something gives way and the whole falls apart.

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.