| debugging AT89S52 | | 01/01/70 00:00 |
| where? | | 01/01/70 00:00 |
| FAQs | | 01/01/70 00:00 |
| Image uploaded and other corrections made | | 01/01/70 00:00 |
| You MUST use a max232 or equivalent | | 01/01/70 00:00 |
| MAx232 connections | | 01/01/70 00:00 |
| if you have connected the PC RS232 directly | | 01/01/70 00:00 |
| ambiguous? | | 01/01/70 00:00 |
| Not necessarily! | | 01/01/70 00:00 |
| Image of MAx232 connection for reference | | 01/01/70 00:00 |
| 89S52 - PC -> MAX232 conenctions | | 01/01/70 00:00 |
| max 232 connection | | 01/01/70 00:00 |
| To test MAX232 | | 01/01/70 00:00 |
| Testing a Com port using hyperterminal | | 01/01/70 00:00 |
| PC Loop-back | | 01/01/70 00:00 |
| Connections of COm port | | 01/01/70 00:00 |
| So what about direct on the COM port | | 01/01/70 00:00 |
| Check the PC's driver | | 01/01/70 00:00 |
| Testing an RS232 driver | | 01/01/70 00:00 |
| results of rs232 testing | | 01/01/70 00:00 |
| Hyperterminal | | 01/01/70 00:00 |
| data not displayed in echo mode in hyperterminal | | 01/01/70 00:00 |
| Why do you call it hypoterminal? | | 01/01/70 00:00 |
| I got confused regarding the value of capacitors | | 01/01/70 00:00 |
| MAx driver and hypertermianl problem solved but... | | 01/01/70 00:00 |
| can somebosy please reply? | | 01/01/70 00:00 |
| Try a step by step aproach | | 01/01/70 00:00 |
| Reg Step by step approach | | 01/01/70 00:00 |
| How are you programming the flash memory of AT89S52 | | 01/01/70 00:00 |
| clarifications | | 01/01/70 00:00 |
| Not to UART | | 01/01/70 00:00 |
| Additional info about the board AT89S52 and ISP | | 01/01/70 00:00 |
| Many issues solved but one | | 01/01/70 00:00 |
| How? | | 01/01/70 00:00 |
| diode...connection | | 01/01/70 00:00 |
| Explain with graph or text | | 01/01/70 00:00 |
| clarification | | 01/01/70 00:00 |
| Study the AT89S52 datasheets | | 01/01/70 00:00 |
| Please read the answers you get | | 01/01/70 00:00 |
| It works now!!!! | | 01/01/70 00:00 |
| What series resistor? | | 01/01/70 00:00 |
| Connection of diode | | 01/01/70 00:00 |
| Please clarify | | 01/01/70 00:00 |
| the problem is NOT the 2.7V | | 01/01/70 00:00 |
| clarifications | | 01/01/70 00:00 |
| Google Ohms law | | 01/01/70 00:00 |
| Report | | 01/01/70 00:00 |
| Measure pin voltage when held low, not hgh | | 01/01/70 00:00 |
| trouble again | | 01/01/70 00:00 |
| details... | | 01/01/70 00:00 |
| Troll? | | 01/01/70 00:00 |
| clarification | | 01/01/70 00:00 |
| I am not an electrical engineer I am a mechanical engineer | | 01/01/70 00:00 |
| Do not accept everything as is, Revise your schematic | | 01/01/70 00:00 |
| who cares? | | 01/01/70 00:00 |
| Short-circuit | | 01/01/70 00:00 |
| OOPS, anyhow | | 01/01/70 00:00 |
| circuit revised but .... | | 01/01/70 00:00 |
| have changed to new buffers .. | | 01/01/70 00:00 |
| Post the revised schematic to check | | 01/01/70 00:00 |
| schematic | | 01/01/70 00:00 |
| there are "LED resistors" whwre are the LEDs and | | 01/01/70 00:00 |
| you are in deep waters | | 01/01/70 00:00 |
| what's the error? | | 01/01/70 00:00 |
| It is hopeless, but anyhow | | 01/01/70 00:00 |
| Vf for diode | | 01/01/70 00:00 |
| Too deep waters indeed, describe everything | | 01/01/70 00:00 |
| then how do you propose they will both work when in patralle | | 01/01/70 00:00 |
| Haven't you seen that he has series resistors with each LED? | | 01/01/70 00:00 |
| update | | 01/01/70 00:00 |
| Resistor value | | 01/01/70 00:00 |
| update.-2 | | 01/01/70 00:00 |
| free-wheel diode | | 01/01/70 00:00 |
| details of relay | | 01/01/70 00:00 |
| details of relay-2 | | 01/01/70 00:00 |
| free-wheel diode always reversed | | 01/01/70 00:00 |
| No simple diode but a zener in series! | | 01/01/70 00:00 |
| zener and IN4148 already in series? | | 01/01/70 00:00 |
| clarification | | 01/01/70 00:00 |
| The datasheet is a bit confusing... | | 01/01/70 00:00 |
| no space to connect | | 01/01/70 00:00 |
| Solder it on the solder side! | | 01/01/70 00:00 |
| Thanks..but | | 01/01/70 00:00 |
| Did you made a PCB ? | | 01/01/70 00:00 |
| YEs true | | 01/01/70 00:00 |
| Regarding zener and In4148 | | 01/01/70 00:00 |
| update on relay testing | | 01/01/70 00:00 |
| testing relay using multimeter | | 01/01/70 00:00 |
| NO, NO, NO | | 01/01/70 00:00 |
| as opposed to | | 01/01/70 00:00 |
| what about the coil across the LEDs? | | 01/01/70 00:00 |
| full picture of relay | | 01/01/70 00:00 |
| use preview | | 01/01/70 00:00 |
| true | | 01/01/70 00:00 |
| Heaven, Erik, ... | | 01/01/70 00:00 |
| it works but for relay orientation | | 01/01/70 00:00 |
| Look at this, too | | 01/01/70 00:00 |
| latest posts | | 01/01/70 00:00 |
| Don't be so quick to experiment | | 01/01/70 00:00 |
| clarifications | | 01/01/70 00:00 |
| make simple tests like this | | 01/01/70 00:00 |
| reg the test circuit.. | | 01/01/70 00:00 |
| circuit details | | 01/01/70 00:00 |
| Still experimenting | | 01/01/70 00:00 |
| Already covered in this thread - more than once | | 01/01/70 00:00 |
| but how did the above circuit work? | | 01/01/70 00:00 |
| Experiments can work, even if incorrect | | 01/01/70 00:00 |
| there is no zener diode | | 01/01/70 00:00 |
| Don't ignore the datasheet. | | 01/01/70 00:00 |
| thanks | | 01/01/70 00:00 |
| Forget the sales engineer! | | 01/01/70 00:00 |
| Minimum turn-on voltage | | 01/01/70 00:00 |
| it HAPPENS to | | 01/01/70 00:00 |
| ther is no other way now | | 01/01/70 00:00 |
| where there is a will, there is a way | | 01/01/70 00:00 |
| is this what you are suggesting? | | 01/01/70 00:00 |
| Relay | | 01/01/70 00:00 |
| Finally reached the shore | | 01/01/70 00:00 |
| Project completed ? | | 01/01/70 00:00 |
| yes completed | | 01/01/70 00:00 |
| Good luck! | | 01/01/70 00:00 |
| Reagrding other relays | | 01/01/70 00:00 |
| Scan through catalogs | | 01/01/70 00:00 |
| you do not need to buy there, but | | 01/01/70 00:00 |
| form factor | | 01/01/70 00:00 |
| The datasheets normally have the answer | | 01/01/70 00:00 |
| files | | 01/01/70 00:00 |
| Not so many files | | 01/01/70 00:00 |
| Regarding LEd | | 01/01/70 00:00 |
| _always_ current-limited supply! | | 01/01/70 00:00 |
| Only if it contains a current limiting resistor! | | 01/01/70 00:00 |
| thanks and file updates | | 01/01/70 00:00 |
| You can enormously save user space... | | 01/01/70 00:00 |
| Hard now | | 01/01/70 00:00 |
Correct! | | 01/01/70 00:00 |
| never do that | | 01/01/70 00:00 |
| Kai, you must be able to see invisible ink | | 01/01/70 00:00 |
