| ??? 08/12/05 06:21 Read: times |
#99244 - SPL Responding to: ???'s previous message |
Russell Bull said:
The LM3915 is probably the easiest solution! Of course it is - it's specifically designed for the purpose! However, I think this is more about doing an interesting project than designing an improved, commercial product? If you MUST use a micro, then you'll need an analog to digital converter - something like a Philips LPC9xx type device... You'll also need tools to do your software - compiler, assembler, linker, debugger... With no hardware experience, you'd probably be best buying a ready-made development kit - like the MCB900 from Keil, or one of the Silicon Labs kits. These come complete with tested, working hardware, software tools, documentation, and example applications - should be everything you need to get started. Silicon Labs has the advantage of on-chip debug - ideal for a novice. The analog electronics are much the same for your lm3915 circuit in that you rectify the signal and average the level. You'll also need to allow for the frequency response of the microphone... For the micro side, you read the value from the analog to digital converter and apply your logic to how you want the leds to operate. The thing with having a micro, of course, is that you are not limited to a simple bargraph... You could do the various dB Sound Pressure Level (SPL) weighting scales, add a PC link - endless possibilities...! |
| Topic | Author | Date |
| how to build an audio level meter? | 01/01/70 00:00 | |
| audio level meter | 01/01/70 00:00 | |
| SPL | 01/01/70 00:00 | |
| boring is beautiful, why try to make a s | 01/01/70 00:00 | |
| Just because. | 01/01/70 00:00 | |
| two reasons, two replies, please reread | 01/01/70 00:00 | |
| Go for it | 01/01/70 00:00 | |
| No resistor | 01/01/70 00:00 | |
| Are you saying that they do not use carb | 01/01/70 00:00 | |
| carbon button microphone | 01/01/70 00:00 | |
| Oh yea ? | 01/01/70 00:00 | |
| Kind of sad, isn't it? | 01/01/70 00:00 | |
awesome thanks | 01/01/70 00:00 |