Cheap WiFi modules

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  1. - 9th December 2014, 03:24 #1
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    Heckler
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    Default Re: CHEAP wifi modules, at last!

    Also, If you are trying to use Putty (terminal program) from your PC and some sort of usb.ftdi serial converter (caution!! 3v3 only) to communicate serially you have to enter CTRL+J to get the thing to take your command.

    If you switch to something like "Termie.exe" it works without the CTRL+J.

    Apparently putty has a problem properly sending either the carrage return or the line feed.

    Also when using the CWJAP command you have to include the quote marks " when you enter your AP credentials.

    I bought one of these off of amazon and it came configured to 9600 baud out of the box.

    NOTE: another way to deal with the 3v3 requirment is to just power your PIC and the ESP module from a single lithium ion battery. No 3v3 to 5v0 converter needed

    Question... how sensitive to over voltage is the 3v3 type devices? If I take my single lithium ion battery off the charger it usually has around 3.8 to 4.0v is that going to be destructive??
    Last edited by Heckler; - 9th December 2014 at 03:33.
    Dwight
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  2. - 9th December 2014, 04:01 #2
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    Default Re: CHEAP wifi modules, at last!

    henrik...

    Thanks so much!! for your example.

    I was able to connect to my ESP module via an FTDI/USB adapter and send the commands you listed in your example from a terminal program (termie.exe) and achieve the same results (after connecting to my device from a browser.

    Now to sharpen up your code and program it into my favorite PIC

    It's good simple examples like yours that can clear up a lot of confusion.

    good stuff!!
    Dwight
    These PIC's are like intricate puzzles just waiting for one to discover their secrets and MASTER their capabilities.
  3. - 9th December 2014, 10:00 #3
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    Default Re: CHEAP wifi modules, at last!

    I guess now I have to learn html ,I think I need a <form or something \form> to get a value from the browser back to the pic .
    any quick tips on how that works ,any simple example would be nice
  4. - 9th December 2014, 23:26 #4
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    Default Re: CHEAP wifi modules, at last!

    modified henriks html to this
    Code:
     < html>
 <TITLE>PBP ESP8266 demo</TITLE>
 <body>
 <H1>Testing the ESP8266</H1>
 <H3>Cool stuff!</H3> Page visits: 3 
<inputname="v2"value="2">
 <inputvalue="1"name="v1"type="submit">
 </body>
 </html>
    it displays a input box and a button but the method of actually sending value back to the pic chip eludes me
  5. - 10th December 2014, 04:23 #5
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    Default Re: CHEAP wifi modules, at last!

    success
    Code:
    < TITLE>PBP ESP8266 demo</TITLE>
 <H1>Testing the ESP8266</H1>
 <H3>Cool stuff!</H3> Page visits:  4
 <formmethod="get"action="set">
 <inputmaxlength="5"value="2" name ="MyInput"size="5">
 <inputvalue="Change MyInput"type="submit">
 </form>
  6. - 10th December 2014, 14:17 #6
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    Default Re: CHEAP wifi modules, at last!

    Here is a link to a few free software programs that some of you may find useful when testing communication. The TCP tool should be helpful for testing getting info between two ESPs.

    https://www.simplecomtools.com/produ...p?idCategory=5

    John
  7. - 11th December 2014, 03:22 #7
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    Default Re: CHEAP wifi modules, at last!

    tried this
    Code:
    < DOCTYPE htmlPUBLIC"-//W3C//DTD HTML 4.01//EN"  "http://www.w3.org/TR/html4/strict.dtd"> 
< html><TITLE>PBP ESP8266 demo</TITLE>
 < H1>Testing the ESP8266</H1>
 < H3>Cool stuff!</H3> Page visits:3
 < formmethod="get"action="set">
 < inputmaxlength="5"value="3" name ="MyInput"size="5">
 < inputvalue="Change MyInput"type="submit">
 </ form></html>
    but I have three android devices two lockup the eps8266 instantly,the other (asus transformer) is ok
    I think as a web server these things are just too flaky , any simultaneous requests will cause instant lookup , the onboard wdt seems to ignore this state likewise for a soft reset .
    fyi the ie browser connect/response pkt is upto 324 bytes, and for the transformer 490 bytes ,its not going to be pic friendly this way.

    will try tcp/udp or even telnet next
  8. - 11th December 2014, 06:15 #8
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    Default Re: CHEAP wifi modules, at last!

    Hi Richard,
    I haven't played any more so you're way ahead of me. Copy/pasting your HTML code into a .txt file (renamed to .htm of course) and opening it in IE does not look like anything really usable to me. Of course, I know very little HTML :-(

    Regarding multiple connections, did you set it up to allow that and are you servicing the second connection request or just ignoring it?

    fyi the ie browser connect/response pkt is upto 324 bytes, and for the transformer 490 bytes ,its not going to be pic friendly this way.
    Why? You don't really need to grab the buffer everything in the PIC, you can parse it on the fly as it arrives. With that said, there are plenty of PICs available with RAM to spare, you do need to go to a 28pin 18F device to "max out" though.

    /Henrik.
  9. - 30th December 2014, 01:59 #9
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    Default Re: CHEAP wifi modules, at last!

    FYI for those of us that remember teletype which required a CR & LF in any order, these devices do not work that way.
    You MUST send CR LF (10,13) in the correct order to work consistently. 10,13 will *sometimes* work, but not always.
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