Matrix user forums

As you can see I am a not very good V5 user and have been doing my head in since February this year without much success. I was using onewire temperature sensors but have recently changed over to Analog Devices TMP36 sensors and have got one to work. However when I tried to add a second sensor I was...

Hi,

For those of you who have got a OneWire flowcode file to work can you tell me if you are using parasite power or not? If you are what mosfet are you using as I can see no specification for it anywhere.

Thanks in anticipation.

I have noe updated Flowcode successfully.

Hi, I have now tried several things as follows. I am using the 877a chip and in all files set the config to 0x3F3A with a clock speed of 20000000Hz and the connections on the panel to Onewire porta0 and the LCD portb 0-5. In the Single OneWire device file downloaded from Examples/Components/Onewire ...

Hi, I have tried to download updates on both my home wifi router and also with a mobile phone dongle and get almost to the end of the download when I get a message something like "download failed network error". Can you tell me how to get around this please? Is it possible for the firmware on my EB0...

Hi Jorgen, I do have a problem with the hardware, I still haven't got it working, but then I haven't spent much time on it yet. From my exeprience of computers over 40 years I have learned to test everything possible, which is why I started this post to make sure that my software was working as it s...

Hi David,
Thanks for clearing that up at least I now know that I don't have a problem with the Flowcode program and it is working normally.

In another post I am asking for help with One Wire programming. A reply from "jgu1" Jorgen included an attached file and I have uploaded below Jorgen's original copy. When I run the simulation I get a value in RetVal at the decision diamond which I then edit to 0 to stop the program branching to "No...

Hi,

Yes I am using the 16F877A and I realise that I need to change the configuration to get the clock settings correct but so far I haven't had a lot of time to get to grips with this. Thanks for your offer.

When I simulate a downloaded programme without any changes I get values for variables. What I don't understand is if I then close that programme and then start again I get different values. Is there some random number generator built into the simulator?

jgu1 wrote:Hi!


Could you try this. It work by me..

Jorgen

Thanks Jorgen. My first attempts are not successful, I think that I need to get into the clock timings in some detail but I appreciate your post.

Ref the previous post I have now got line numbers by opening the C file in Open Office and they are 271 - 278

I have now tried the DS18B20+ sensors but still get the same result - no temperature reading. Looking at the data sheets the difference between the DS18B20 and DS18S20 seems to be the thermometer resolution which is DS18B20 9 to 12 user selectable but the DS18S20 is 9 bits. I am trying to get my hea...

I have run a one second flasher and this works well at 20MHz on my hardware. I have then run the single onewire device file at 20MHz but still can't get a temperature reading. Following your post I have ordered some DS18B20+ sensors.

I get 5 volts between pin 1 and 3. It is the Multiple Onewire example from Matrix downloads with the Onewire connection changed to Porta1 and I have changed the clock speed to 4000000 in the config chip window. Previously I have tried this at all clock speeds. Another problem is that there is no exp...

Close up.jpg Overall layout.jpg I think that I have included the pull up resistor, can you have a look at the photos and see if I have got the circuit correct? I have been reading all the posts in the forums with any reference to One Wire and also the DS1820 data sheet. I have changed the One Wire ...

I'm new to Flowcode V5 for PIC with EB006 multiprogrammer board using a 16F877A chip trying to get into One Wire devices. I have several DS18S20 sensors and so far have not had any luck in getting the sensors to communicate with the PIC. The Multiple Onewire example file compiles to the chip O.K. an...