| ??? 04/23/07 00:25 Read: times |
#137773 - Some mistake Responding to: ???'s previous message |
Hi Hendryawan,
Assume probe_input is floating (3-state) or low. The result in P3.4 (PROBE) is allways the same: it will be FLOAT\, because base transistor voltage is >0.6V when FLOAT=VH. I think that the right side 10K resistor should be arround 100K (or more). In that case, only if the tip probe is 3-atate, PROBE will be FLOAT\. Otherwise, PROBE will be probe_input\ Anyway, IMHO it is an interesting aproach to solve your problem. Regards, Daniel |
| Topic | Author | Date |
| tri state input reading | 01/01/70 00:00 | |
| tri-state | 01/01/70 00:00 | |
| Reading TriState | 01/01/70 00:00 | |
| Hi-Z reading | 01/01/70 00:00 | |
| Logic Probe Concept | 01/01/70 00:00 | |
| Window Comparator | 01/01/70 00:00 | |
| Build Or Buy | 01/01/70 00:00 | |
| Using Analogue Methods to test for Hi-Z | 01/01/70 00:00 | |
| Spare ADC and DAC on your micro? | 01/01/70 00:00 | |
| search found | 01/01/70 00:00 | |
| Some mistake | 01/01/70 00:00 | |
| 100k resistor | 01/01/70 00:00 | |
| An idea... | 01/01/70 00:00 | |
| Fundamental Logic and Hi-Z impedance | 01/01/70 00:00 | |
| Some thoughts on the tristate detection | 01/01/70 00:00 | |
| not 'the first', but THE problem | 01/01/70 00:00 | |
| Heisenberg | 01/01/70 00:00 | |
agreed | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 |