| Sivanand Somasundaram 06/24/09 22:27 Read: 408 times Singapore Singapore |
#166434 - Image uploaded and other corrections made Responding to: Sivanand Somasundaram's previous message |
 This is the image I wanted to upload.
Sorry last time I could not uplaod because basically I did not know how to do the same as I was new. Regarding the other corrections.I have labelled the actual port in the drawing now. But I have connected 16 WR of AT89s52 to pin 2(RXD) of rs232 and 17 RD of AT89S52 to pin 3(TXD) of RS232 directly. I want to know if the PCB schematic as uploaded here is correct? |
| Topic | Author | Date |
| debugging AT89S52 | Sivanand Somasundaram | 06/24/09 09:52 |
| where? | Erik Malund | 06/24/09 15:08 |
| FAQs | Jan Waclawek | 06/24/09 15:19 |
| Image uploaded and other corrections made | Sivanand Somasundaram | 06/24/09 22:27 |
| You MUST use a max232 or equivalent | David Prentice | 06/25/09 01:19 |
| MAx232 connections | Sivanand Somasundaram | 06/25/09 05:37 |
| if you have connected the PC RS232 directly | Erik Malund | 06/25/09 06:15 |
| ambiguous? | Andy Neil | 06/25/09 07:02 |
| Not necessarily! | Richard Erlacher | 06/27/09 17:32 |
| Image of MAx232 connection for reference | Sivanand Somasundaram | 06/25/09 05:40 |
| 89S52 - PC -> MAX232 conenctions | Shoaib Ali | 06/25/09 06:49 |
| max 232 connection | Sivanand Somasundaram | 06/30/09 06:10 |
| To test MAX232 | Shoaib Ali | 06/30/09 17:21 |
| Testing a Com port using hyperterminal | Sivanand Somasundaram | 07/01/09 01:44 |
| PC Loop-back | Andy Neil | 07/01/09 02:13 |
| Connections of COm port | Sivanand Somasundaram | 07/01/09 04:16 |
| So what about direct on the COM port | Andy Neil | 07/01/09 08:11 |
| Check the PC's driver | Hal Albach | 07/01/09 10:21 |
| Testing an RS232 driver | Andy Neil | 07/01/09 13:13 |
| results of rs232 testing | Sivanand Somasundaram | 07/02/09 02:17 |
| Hyperterminal | Sivanand Somasundaram | 07/02/09 05:43 |
| data not displayed in echo mode in hyperterminal | Andy Neil | 07/02/09 06:08 |
| Why do you call it hypoterminal? | Richard Erlacher | 07/06/09 08:29 |
| I got confused regarding the value of capacitors | Andy Neil | 06/30/09 18:48 |
| MAx driver and hypertermianl problem solved but... | Sivanand Somasundaram | 07/03/09 04:55 |
| can somebosy please reply? | Sivanand Somasundaram | 07/05/09 05:52 |
| Try a step by step aproach | KONSTANTINOS L. ANGELIS | 07/05/09 14:53 |
| Reg Step by step approach | Sivanand Somasundaram | 07/05/09 23:08 |
| How are you programming the flash memory of AT89S52 | KONSTANTINOS L. ANGELIS | 07/06/09 02:51 |
| clarifications | Sivanand Somasundaram | 07/06/09 03:31 |
| Not to UART | Per Westermark | 07/06/09 03:51 |
| Additional info about the board AT89S52 and ISP | KONSTANTINOS L. ANGELIS | 07/06/09 11:49 |
| Many issues solved but one | Sivanand Somasundaram | 07/07/09 00:58 |
| How? | Per Westermark | 07/07/09 02:26 |
| diode...connection | Sivanand Somasundaram | 07/07/09 02:56 |
| Explain with graph or text | Per Westermark | 07/07/09 03:02 |
| clarification | Sivanand Somasundaram | 07/07/09 03:25 |
| Study the AT89S52 datasheets | KONSTANTINOS L. ANGELIS | 07/07/09 03:59 |
| Please read the answers you get | Per Westermark | 07/07/09 04:04 |
| It works now!!!! | Sivanand Somasundaram | 07/07/09 04:20 |
| What series resistor? | Per Westermark | 07/07/09 04:50 |
| Connection of diode | Sivanand Somasundaram | 07/07/09 05:33 |
| Please clarify | Per Westermark | 07/07/09 05:46 |
| the problem is NOT the 2.7V | Erik Malund | 07/07/09 06:27 |
| clarifications | Sivanand Somasundaram | 07/07/09 09:11 |
Google Ohms law  | Per Westermark | 07/07/09 09:55 |
| Report | Sivanand Somasundaram | 07/07/09 22:00 |
| Measure pin voltage when held low, not hgh | Per Westermark | 07/08/09 02:12 |
| trouble again | Sivanand Somasundaram | 07/08/09 05:25 |
| details... | Sivanand Somasundaram | 07/08/09 05:34 |
| Troll? | Per Westermark | 07/08/09 06:19 |
| clarification | Sivanand Somasundaram | 07/08/09 07:37 |
| I am not an electrical engineer I am a mechanical engineer | Andy Neil | 07/08/09 09:14 |
| Do not accept everything as is, Revise your schematic | KONSTANTINOS L. ANGELIS | 07/08/09 06:39 |
| who cares? | Erik Malund | 07/08/09 07:40 |
| Short-circuit | Per Westermark | 07/08/09 07:54 |
| OOPS, anyhow | Erik Malund | 07/08/09 08:16 |
| circuit revised but .... | Sivanand Somasundaram | 07/12/09 22:27 |
| have changed to new buffers .. | Sivanand Somasundaram | 07/12/09 23:49 |
| Post the revised schematic to check | KONSTANTINOS L. ANGELIS | 07/13/09 02:22 |
| schematic | Sivanand Somasundaram | 07/13/09 03:09 |
| there are "LED resistors" whwre are the LEDs and | Erik Malund | 07/13/09 06:28 |
| you are in deep waters | Andy Neil | 07/13/09 08:01 |
| what's the error? | Sivanand Somasundaram | 07/13/09 09:20 |
| It is hopeless, but anyhow | Erik Malund | 07/13/09 09:38 |
| Vf for diode | Sivanand Somasundaram | 07/13/09 10:32 |
| Too deep waters indeed, describe everything | KONSTANTINOS L. ANGELIS | 07/13/09 10:54 |
| then how do you propose they will both work when in patralle | Erik Malund | 07/13/09 16:50 |
| Haven't you seen that he has series resistors with each LED? | Kai Klaas | 07/13/09 19:08 |
| update | Sivanand Somasundaram | 07/13/09 21:25 |
| Resistor value | Sivanand Somasundaram | 07/13/09 23:10 |
| update.-2 | Sivanand Somasundaram | 07/14/09 04:22 |
| free-wheel diode | Per Westermark | 07/14/09 04:25 |
| details of relay | Sivanand Somasundaram | 07/14/09 04:33 |
| details of relay-2 | Sivanand Somasundaram | 07/14/09 04:37 |
| free-wheel diode always reversed | Per Westermark | 07/14/09 05:41 |
| No simple diode but a zener in series! | Kai Klaas | 07/14/09 08:32 |
| zener and IN4148 already in series? | Sivanand Somasundaram | 07/14/09 09:52 |
| clarification | Sivanand Somasundaram | 07/14/09 09:58 |
| The datasheet is a bit confusing... | Kai Klaas | 07/14/09 10:02 |
| no space to connect | Sivanand Somasundaram | 07/14/09 10:12 |
| Solder it on the solder side! | Kai Klaas | 07/14/09 10:26 |
| Thanks..but | Sivanand Somasundaram | 07/14/09 21:49 |
| Did you made a PCB ? | KONSTANTINOS L. ANGELIS | 07/14/09 15:05 |
| YEs true | Sivanand Somasundaram | 07/14/09 21:28 |
| Regarding zener and In4148 | Sivanand Somasundaram | 07/14/09 22:18 |
| update on relay testing | Sivanand Somasundaram | 07/15/09 01:12 |
| testing relay using multimeter | Sivanand Somasundaram | 07/15/09 01:25 |
| NO, NO, NO | Erik Malund | 07/15/09 06:56 |
| as opposed to | Erik Malund | 07/15/09 06:47 |
| what about the coil across the LEDs? | Erik Malund | 07/14/09 05:03 |
| full picture of relay | Sivanand Somasundaram | 07/14/09 05:11 |
| use preview | Erik Malund | 07/14/09 05:24 |
| true | Sivanand Somasundaram | 07/14/09 07:52 |
| Heaven, Erik, ... | Kai Klaas | 07/14/09 08:41 |
| it works but for relay orientation | Sivanand Somasundaram | 07/14/09 09:02 |
| Look at this, too | Kai Klaas | 07/14/09 09:03 |
| latest posts | Sivanand Somasundaram | 07/15/09 01:29 |
| Don't be so quick to experiment | Per Westermark | 07/15/09 03:11 |
| clarifications | Sivanand Somasundaram | 07/15/09 04:02 |
| make simple tests like this | KONSTANTINOS L. ANGELIS | 07/15/09 04:44 |
| reg the test circuit.. | Sivanand Somasundaram | 07/15/09 04:58 |
| circuit details | Sivanand Somasundaram | 07/15/09 05:20 |
| Still experimenting | Per Westermark | 07/15/09 05:30 |
| Already covered in this thread - more than once | Per Westermark | 07/15/09 05:21 |
| but how did the above circuit work? | Sivanand Somasundaram | 07/15/09 05:27 |
| Experiments can work, even if incorrect | Per Westermark | 07/15/09 05:48 |
| there is no zener diode | Sivanand Somasundaram | 07/15/09 07:21 |
| Don't ignore the datasheet. | Per Westermark | 07/15/09 07:42 |
| thanks | Sivanand Somasundaram | 07/15/09 09:02 |
| Forget the sales engineer! | Kai Klaas | 07/15/09 08:01 |
| Minimum turn-on voltage | Kai Klaas | 07/15/09 08:38 |
| it HAPPENS to | Erik Malund | 07/15/09 07:11 |
| ther is no other way now | Sivanand Somasundaram | 07/15/09 07:17 |
| where there is a will, there is a way | Erik Malund | 07/15/09 08:31 |
| is this what you are suggesting? | Sivanand Somasundaram | 07/15/09 09:25 |
| Relay | Steve M. Taylor | 07/15/09 15:35 |
| Finally reached the shore | Sivanand Somasundaram | 07/16/09 05:15 |
| Project completed ? | KONSTANTINOS L. ANGELIS | 07/16/09 05:23 |
| yes completed | Sivanand Somasundaram | 07/16/09 06:51 |
| Good luck! | Kai Klaas | 07/16/09 07:38 |
| Reagrding other relays | Sivanand Somasundaram | 07/16/09 21:03 |
| Scan through catalogs | Per Westermark | 07/17/09 01:05 |
| you do not need to buy there, but | Erik Malund | 07/17/09 06:44 |
| form factor | Sivanand Somasundaram | 07/20/09 03:45 |
| The datasheets normally have the answer | Per Westermark | 07/20/09 03:56 |
| files | Sivanand Somasundaram | 07/20/09 04:23 |
| Not so many files | Per Westermark | 07/20/09 05:37 |
| Regarding LEd | Sivanand Somasundaram | 07/23/09 08:13 |
| _always_ current-limited supply! | Per Westermark | 07/23/09 08:50 |
| Only if it contains a current limiting resistor! | Kai Klaas | 07/23/09 08:50 |
| thanks and file updates | Sivanand Somasundaram | 07/23/09 21:23 |
| You can enormously save user space... | Kai Klaas | 07/24/09 08:30 |
| Hard now | Per Westermark | 07/24/09 08:36 |
Correct! | Kai Klaas | 07/24/09 09:12 |
| never do that | Erik Malund | 07/15/09 07:07 |
| Kai, you must be able to see invisible ink | Erik Malund | 07/15/09 07:03 |