| ??? 04/11/05 11:22 Read: times |
#91362 - Parking sensors - UK Responding to: ???'s previous message |
By coincidence, I just bought an 8 sensor (four front, four rear) parking aid for my car. It was just 40gbp from:
http://stores.ebay.co.uk/GPS-Deals...E-AUCTIONS Haven't fitted it yet, but it seems to work fine on the bench. Of course, I opened it up to find it well constructed - mostly SMD on fibreglass - exceptional value (even so, bet the Chinese sell it for around 10gbp!). No 8051, but a 16-dip socketed cpu with numbers scratched off. It has a relay to swap between front and rear groups of four sensors. Each sensor has a drive circuit and tuned 'tank' coil. Each is driven, one at a time, with a 0.5ms burst of 40kHz (giving >100v p-p on the piezo!) and presumeably, after the burst, it listens on the same sensor. A 3ft range would take around 6ms for the echo to propagate. |
| Topic | Author | Date |
| ultrasonic transducer -Tx Rx in one pack | 01/01/70 00:00 | |
| Listen very carefully. | 01/01/70 00:00 | |
| Ultrasonic Signal Processing | 01/01/70 00:00 | |
| The other direction | 01/01/70 00:00 | |
| Re: The other direction | 01/01/70 00:00 | |
| Is US the only solution ? | 01/01/70 00:00 | |
| outdoor project | 01/01/70 00:00 | |
| Does this help ? | 01/01/70 00:00 | |
| yes thanx | 01/01/70 00:00 | |
| Parking sensors - UK | 01/01/70 00:00 | |
| Ta. | 01/01/70 00:00 | |
| Parking | 01/01/70 00:00 | |
| Reversing tables... | 01/01/70 00:00 | |
| Damaged tables... | 01/01/70 00:00 | |
| Minicam | 01/01/70 00:00 | |
OT - Minicams and LCDs | 01/01/70 00:00 | |
| IR will work: | 01/01/70 00:00 | |
| Ranging | 01/01/70 00:00 | |
| 32 bit devided by 16 bit | 01/01/70 00:00 | |
| 32 bit devided by 16 bit | 01/01/70 00:00 | |
| Code Library | 01/01/70 00:00 |