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| 1 | 15 Feb 2010 05:18 PM florin ciobanu From: pitesti, romania |
| Salutari, vreau sa fac si eu ceasul si nu am afisoare decat cu catod comun, si nu pot sa-mi dau seama cum sa modific codul, se poate modifica?, pot sa modific legaturile electronice dar nu vreau sa complic schema electronica. Multumesc! Response: Adresa gresita de mail? Te rog scrie-mi pe yahoo: borca_bn Bogdan |
| 2 | 15 Feb 2010 05:15 PM Gábor From: Budapest |
| Hi, please if You can, say something for me about the temp conversion... because I need to display the temperature on 16 char LCD. I can convert the LSB and MSB to digits, but only by .5 degrees.... I dont know how can I convert for example the 2000x0.0625 to 125 C in digits... when the 18b20 is in 12 bit version of course.   Response: Hi Gábor I did not used this resolution and don't know a straight answer for you, but if you can figure out this example from the ds18b20 datasheet: +25.0625 | (MSB)0000 0001 (LSB)1001 0001 | 0191h then I think you could find the answer. Regards, Bogdi |
| 3 | 11 Jan 2010 10:32 AM George From: Houston, Texas USA |
| Hello, I tried the program on a 628A ( newer version of the 628) and it works GREAT!!!:). It loaded perfectly the first time through MPLAB and no downloading issues. Question - I noticed over a 24 hour period the clock looses roughly 30 seconds / day. Is this normal? Thanks Again for your help ! George Response: Hi George, I'm glad the code works on 628A.  The timing error is normal because of the cheap xtal this clock is using. I have like 20 seconds lost/day for 628 clock and 7 seconds gain/day for 84 clock even if they are using same software based on Roman's Black zero-error algorithm. Problem is in both cases the hardware (either xtal or capacitors used). For this reason I've created the possibility to adjust or calibrate the second and make the clock very accurate. Download new code with Sh and Sl settings and read my section about how to calibrate your clock. Regards, Bogdi |
| 4 | 31 Dec 2009 01:10 PM Tarmo From: Estonia |
| Hey! Having problems.. PIC16F84A clock and date, wout ds18s20. All data just runs in screen, wont stop. And when i want to compile .asm to .hex.. it gives like about 700 errors .. help :(. digital clock needed :) |
| 5 | 25 Dec 2009 12:47 PM George From: Houston, Texas USA |
| Hello, Thanks for making your project available to everyone !:) My question is that I would like to use a PIC16F628A versus a 628. In MicroChip's release notes they say that the 628A is upward compatible with the 628. The differences look minor and I was wondering if you had tried your code with the newer 628A PIC chip. Also, the 628A has an internal 4 Mhz oscillator - how would your code be affected by this? Thank you very much !! Best Regards, George Response: Hi George, I didn't try the code with 628A. The code shouldn't be affected by the 4MHz internal oscillator because I specified in the configuration word the option _XT_OSC, which means that the PIC is driven by the external oscillator. I've read about 628A but I also could find the internal oscillator mentioned in the 628 datasheet which confuses me  . I think it shouldn't be a problem using 628A in this project, but also would not say that I'm 100% sure is works, rather 90%  . If by chance doesn't work, the "A" will not be a major problem to fix  .Cheers, Bogdi |
| 6 | 17 Dec 2009 09:04 PM farhang From: london/england |
| HI,dear Bogdi i would like to ask you is it possible to alter your program for project(clock/thermome Response: I did receive one more request to change the ja to 01 and fe to 02 and that makes two requests . I would not want to make another version of this code but rather make new options to the existing one: tt:set time to display the time (if 0 then the time is not shown) (from 0 to 99 seconds) td:set time to display the date (if 0 then the date is not shown) (from 0 to 99 seconds) te:set time to display the temperature (from 0 to 99 seconds) (if 0 then the sensor is not needed because the temp is not shown) dt:date type:01 -> with letters; 02 -> with numbers You can debug the code with MPlab and see where the letters are located or you can wait until I'll finish the new code I don't know when, but I suppose soon. |
| 7 | 08 Dec 2009 03:58 PM mely17 From: Romania |
| Am uitat sa precizez ca senzoru meu este DS1820 si daca il incalzesc cu degetele imi indica 30C dar daca il las si temperatura scade sub 25C atunci automat imi indica -1C! Cu palpaitu am rezolvat! Mersi, Response: Intr-adevar a fost o problema cu sloturile de timpi folositi pentru preluare. Mersi pentru rabdare si mai ales ca mi-ai zis. Curios a fost ca senzorii care i-am folosit eu au mers, cel mai probabil e ca intre ei sunt oarecum diferente. Am facut pe site update la toate pachetele care folosesc DS18S20/B20. Multumesc inca o data. Bogdi |
| 8 | 08 Dec 2009 03:20 PM mely17 From: Romania |
| Salut! Am realizat montaju cu 18S20! Imi indica -1C am verificat daca senzoru este bine conectat sau daca rezistenta de 4K7 are valoarea buna sau daca e lipitia bine si totul este ok! DS18S20 este compatibil cu DS1820? Mai am inca o problema la ultimu digit partile care ar trebui sa stea stinse imi palpaie in continu! Mersi, Respect  |
| 9 | 12 Nov 2009 05:30 AM Gabi From: Timisoara/Romania |
| se poate folosi si DS18B20? sau potzi sa rescri in cod pt. el? merci Response: Da, nu merge cu B20 dar o sa scriu un cod pentru el. Testarea pot sa o fac doar in Proteus neavand piesa. Testarea efectiva o sa-ti ramana tie daca o sa faci circuitul. Poate o sa am ceva timp liber in weekend... Bogdi |
| 10 | 24 Oct 2009 04:23 AM krish From: sri lanka |
| hi, i cant find the sensor here..can i use the LM35Z for that place..?? thanks..  Response: Hi krish, LM35Z works different so you cannot use it. Sorry, but you can request a free sample from Maxim www.maxim-ic.com, for free (!) (as I did) and will be shipped to you in 2 weeks. Cheers, Bogdan |