| ??? 10/24/08 16:47 Read: times |
#159313 - Resistor to processor too. Responding to: ???'s previous message |
A 1k resistor when used with 5V voltage would limit the current to 5mA.
Are you sure that you have configured the I/O pin of your processor to be an input and not an activelly driven output? You should have a resistor from the photo transistor to the input pin on the processor too.
5V -------+
|
-
| | +----------+
| | | |
- ____ | |
|---|____|-----| uC |
/ | |
|/ | |
--| | |
|\ | |
_\| | |
| +----------+
|
+V--------+
|
| Topic | Author | Date |
| tachometer | 01/01/70 00:00 | |
| schematic, please | 01/01/70 00:00 | |
| Datasheet? | 01/01/70 00:00 | |
| reply to tachometer | 01/01/70 00:00 | |
| Resistor to processor too. | 01/01/70 00:00 | |
| the schematic is | 01/01/70 00:00 | |
| Limitation of base current to 2N2222? | 01/01/70 00:00 | |
| in effect | 01/01/70 00:00 | |
| another option | 01/01/70 00:00 | |
| What is your part in this assignment? | 01/01/70 00:00 | |
| thanks | 01/01/70 00:00 | |
| Don't panic | 01/01/70 00:00 | |
| RE: dont have enough knowledge on microcontrollers | 01/01/70 00:00 | |
| CODE | 01/01/70 00:00 | |
| expecting a reply now | 01/01/70 00:00 | |
| Not BCD! | 01/01/70 00:00 | |
| how to solve? | 01/01/70 00:00 | |
| your task | 01/01/70 00:00 | |
| trying!! | 01/01/70 00:00 | |
| not found !!!! | 01/01/70 00:00 | |
| Trivial solution: compare/subtract | 01/01/70 00:00 | |
| thanks a lot!!! | 01/01/70 00:00 | |
| google or paper and pen | 01/01/70 00:00 | |
| something weird | 01/01/70 00:00 | |
| treading dangerous waters | 01/01/70 00:00 | |
Nothing weird | 01/01/70 00:00 |