| ??? 06/26/03 22:21 Read: times |
#49463 - RE: detector of 220volt Responding to: ???'s previous message |
Drop the capacitor and put a resistor (10k or so) from Vcc to the base of the transistor and short out the 1M resistor. Now you have pulses when 220 is present and nothing when not.
then add
| --------
collector -| >--- 10k --*---- to port pin
|/ -------- |
-----
----- 10nF
|
gnd
to detect the presence of 220 pull the port pin low, then high, wait a bit and test the pin. Erik |
| Topic | Author | Date |
| detector of 220volt | 01/01/70 00:00 | |
| Draw a schematic! | 01/01/70 00:00 | |
| RE: detector of 220volt | 01/01/70 00:00 | |
| ASCII Art | 01/01/70 00:00 | |
| RE: detector of 220volt | 01/01/70 00:00 | |
| RE: detector of 220volt | 01/01/70 00:00 | |
| RE: detector of 220volt | 01/01/70 00:00 | |
| RE: detector of 220volt | 01/01/70 00:00 | |
| Transformer isolation | 01/01/70 00:00 | |
| RE: Transformer isolation | 01/01/70 00:00 | |
| RE: Transformer isolation | 01/01/70 00:00 | |
| Circuit works! | 01/01/70 00:00 | |
| RE: Circuit works! | 01/01/70 00:00 | |
| RE: Circuit works! | 01/01/70 00:00 | |
| RE: Transformer isolation | 01/01/70 00:00 | |
| RE: Transformer isolation | 01/01/70 00:00 | |
RE: Transformer isolation | 01/01/70 00:00 | |
| RE: detector of 220volt | 01/01/70 00:00 |