| ??? 03/21/05 16:14 Read: times |
#90138 - Thats it Responding to: ???'s previous message |
I have 4 AA batteries. Two of them (3.3 or so) will be to power the micro and all four (6.6) to power the solenoid.
Just for illustration visualize every battery with a 10 ohm resistor in series. What happen to your uC supply when the solenoid kicks in. Do remember that a solenoid has a very large "inrush current". You will need to either use separate batteries for the uC or derive a stabilized 3.3 (e.g. LM2937) for the uC. Then make sure that no return current for the solenoid driver affect the uC (-batt directly to - solenoid driver) I guess I should retract what I said about "not noise" if you supply the uC with the batteries or another separate supply when you operate "net powered without problems". Erik |
| Topic | Author | Date |
| LPC932 Oscillating | 01/01/70 00:00 | |
| scope | 01/01/70 00:00 | |
| Scope | 01/01/70 00:00 | |
| BIG electrolytic | 01/01/70 00:00 | |
| Bypass where | 01/01/70 00:00 | |
| Diode ? | 01/01/70 00:00 | |
| No I do not | 01/01/70 00:00 | |
| flywheel diode | 01/01/70 00:00 | |
| Freewheeing Diode | 01/01/70 00:00 | |
| Holy Cow | 01/01/70 00:00 | |
| More Explosions | 01/01/70 00:00 | |
| flywheel | 01/01/70 00:00 | |
| Thank you all! | 01/01/70 00:00 | |
| Flywheel | 01/01/70 00:00 | |
| flywheel. | 01/01/70 00:00 | |
| battery | 01/01/70 00:00 | |
| Did not work | 01/01/70 00:00 | |
| try both LF and HF | 01/01/70 00:00 | |
| 3.3 amd 6.6 | 01/01/70 00:00 | |
| Thats it | 01/01/70 00:00 | |
| LM2937 | 01/01/70 00:00 | |
| what is solarbotics | 01/01/70 00:00 | |
| Excellent | 01/01/70 00:00 | |
| Battery | 01/01/70 00:00 | |
| Simple RC-filters might help | 01/01/70 00:00 | |
| Diode 1N4000 | 01/01/70 00:00 | |
| Will not help | 01/01/70 00:00 | |
| Got it. | 01/01/70 00:00 | |
| Answer needed, please | 01/01/70 00:00 | |
| Whoops! | 01/01/70 00:00 | |
| You don't know the currents?????? | 01/01/70 00:00 | |
| Current ? | 01/01/70 00:00 | |
Found out what currents are flowing? | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| Ok | 01/01/70 00:00 | |
| Diode type | 01/01/70 00:00 | |
| Oscillations... | 01/01/70 00:00 | |
| aka | 01/01/70 00:00 | |
| Exactly! | 01/01/70 00:00 |