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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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| | LinkBack | Thread Tools | Display Modes |
8th September 2003, 12:32 AM
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 i might need some help on programming each pic could some1 maybe give me a hand or a point in the right direction? Thanks | |
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8th September 2003, 02:24 PM
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| From what you're saying, it sounds like you want to use multiple PICs. A single PIC would be able to do everything you need here, including frequency counting. I think you should still stick with the Freq to Voltage conversion chips. Even though they aren't necessary, it will simplify implementation for you. The programming will be pretty simple, a loop comparing the 2 Analog signals and turning on the specific output pins based on the speed inputs. Making a frequency counter, though not all that difficult, would require more programming knowledge. There's enough amateur PIC articles out there that you should be able to get through it on your own.
__________________ Mark Higgins | |
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9th September 2003, 02:05 PM
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| Cool thxs for your response. Where can i buy Freq to Voltage conversion chips and how much are they usually. And can you get them programable in most languages. I think i can only gain access to assembly software. So i think it will have to be wrote in assembly also. | |
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9th September 2003, 08:10 PM
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| You can get the lm2907 and lm2917 from Digikey.com for less the $2.50 each. The datasheets with sample circuits are on the national semiconductor site. www.national.com These are not programmable chips. They simply convert a frequency to a voltage level that can be read by an analog to digital input. To make it easier, I would choose a PIC with built in A2D.
__________________ Mark Higgins | |
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11th September 2003, 02:27 PM
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| CHANGE OF PLAN! Hi all again... I've decided to change my project into just a tacho for my RPMS. I've been experimenting in crocodile technology with microcontrollers and stuff. What i can't work out is how to get a output from the microcontroller. And how to then display that value in 5 7 segment displays? As for the input side of things i seem to be ok. Thanks in advance. | |
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12th September 2003, 05:32 PM
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 some1? heh | |
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15th September 2003, 12:10 PM
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| bump... | |
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15th September 2003, 02:42 PM
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| Motorcycle Gear Indicator Suzuki made many of their bikes back in the 80's with gear shift indicators. You might want to check out service manuals for the GS425's through the GS 1000's from that decade. Please don't ask how I know something about those machines. :lol: As for your tachometer, there are a number of electronic project sites on the WWW that show PICs with multiplexed seven digit displays. This means that one data bus is used to provide data to all the seven segment displays, but individual chip select signals are used to coordinate which display is enabled at the same time that its data is available on the common bus. If you cycle the chip select and the display data fast enough, the human eye can not see the display flicker. Or, you could use a data latch with each seven segment display, and use the chip select control to update each data latch individually. | |
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15th September 2003, 09:00 PM
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| hey dave cheers for your help m8! Good stuff. Anyone got any more? | |
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Linear Mode
