Component to read DS18B20 digital temperature sensors

 Hi odissey1

many thanks for your usefull component. Nice and usefull work.

Best regards

Viktor

Well done! And a sophisticated documentation! I like that.

Bob

Check it in Creator SP2, just released. Consider re-posting it if

necessary.

Regards, Dana.

The demo programs are missing the KEES librarys for the Psoc Pioneer board and the Psoc 420 board and gives the folowing errors The instance 'PSoC_4_Pioneer_Kit_1', of component PSoC_4_Pioneer_Kit, contains an error. Unable to locate and customize component 'PSoC_4_Pioneer_Kit' used in schematic 'C:\Users\Bob\Documents\Cypress Projects\one_wire\Demo1\DS18x8_demo.cydsn\TopDesign\TopDesign.cysch'. and Unable to find dependency 'KEES_Library' at 'C:\Program Files (x86)\Cypress\Component libraries\KEES_Library.cylib\KEES_Library.cyprj'. Please verify your project dependencies are correct.. Where can  these updated library's be found? I have tried the one's in the 100 projects in 100 days in PSOC 3.0 and have hot rried them in the PSOC 3.0 and have not tried them in PSOC 3.1 SP2.  Also they do not contain the PSOC 4200 board.

 I have successfully used odissey1's DS18B20 1-wire component and found it well-documented and easy to use. However, I would also like to use the DS18B20 in a project that requires nearly all of the UDBs for other functions, not leaving enough for the status and control registers of the DS18B02 component. Does anyone know of a PSoC 4 BLE compatible 1-wire component or library that either bit-bangs a GPIO or uses one of the Serial Comm Blocks? If not, I'd welcome any tips to start to roll my own.

I found the website below, which itself references the Maxim datasheet on how to use a UART as a 1-wire master. I'm thinking that, by using the bidirectional digital pins of the PSoC, I wouldn't need the external two-transistor circuit shown.

dangerousprototypes.com/2012/10/28/app-note-using-uart-to-implement-a-1-wire-bus-master/

Thanks,

Don

 Thanks! I've downloaded it and will report on what I find.

Dear odissey1,

Nice work for decoding DS18B20 using PSOC4.

I had made one small change in your original code to get its output on 20x4LCD but just getting 3960 on LCD.

Kindly help on same. Thanks in advance.

Nain.

Nain: You had some issues with your program and your output to the LCD was incorrect and was flagged by Psoc Creator I changed it to LCD_printString and it seems to work.  Also what version of PSOC Creator are you running. I didn't up-grade it to the latest version as I didn't want you to have issues with opening it. Also the Maxim chip will provide the answer in Deg C or Deg F you just have to read the correct Memory location.  You can also convert it with some math °C  x  9/5 + 32 = °F or (°F  -  32)  x  5/9 = °C. I don't have the DS18B20 device to try it so I was not able to read any real data. Also there is a char LCD library that allows you to use any pin on any port so you don't have to loose so many pins in a row.

Hello there,

I am using the DS18B20 sensor (only 1 sensor) with your ds18x8 component and I am experiencing some problems (both with psoc 3 and 5). The problem overall is that the sensor is not communicating, both in parasite and normal mode. In parasite in particular I am connecting both GND and VDD to the mass of my psoc and the DQ to a bidirectional digital pin (open drain drives high, initial state high). I tried two configurations: DQ directly to psoc's pin and Dq to pisoc and in parallel to VDD through a 4K resistor; both are not working. (actually in a case psoc 3 had 15.9365 as fixed output, but I have changed the code and can't come back to that window)

My code's flow is something like this (I jot it down as pseudocode):

-Start DS component();

-send temperature request

-if data is ready then read temperature

-get the temperature thru gettemperatureasfloat and use sprint f to put it into a string

-use the USBUART module of the psoc to send the data to the PC

The output is always -256.00 !

Could you help finding the error?

Thanks,

Matteo