I have built a turbo jet engine, I have a spinning shaft on the compressor of the turbocharger. I need wave to send a beam of light to the then, because the shaft than 6 points, I should be able to speed and the brakes are making the light. what kind of light beam? can I have a 555 timer that can be triggered by the light beam and then send it to a digital meter? I have a 555 timer in my ignition system that a coil with a spark of the spark pulses, the propane to ignite. so, how and what kind of light beam with the 555 is the question. Thanks for everything you do, any Dave Ideas for this project would greatly apreaciated. http://www.davesjetengines.com to: koki83 - Not sure what you are saying? , Buy something from scrap yard?
First I will address the meter scale. If you have a pulse per revolution of your sensor, finished the 555 to one pulse per minute. Use it to reset the counter and to increase the use of the sensor output of the counter. Thus, the sensor counts how many pulses you get per minute. You need to access a register and display The count pulse from the 555 it is. When you get to 6 sensor pulses per revolution, set the 555 to 1 / 6 for one minute rate. Again, the counter collect RPM. Depending on the RPMs measure to try and the number of digits in your counter, you may have to the 555-timer rate according to scale. For example, if you have a four-digit counter to count, however, that at least up to 11,000 rpm, you need the 555 to one-tenth of a minute as 11,000 rpm / min of 1100 appears to be set and you have the "0" , Present in the right-most position. As for the sensor, perhaps it would be easier to use a magnetic pickup (assuming your rotating blades Based on iron). The magnetic sensors are easy to get, has all cars many of them. Engine speed-sensing, remote sensing, drive shaft RPM, etc. You should very much from the junkyard. Whether you choose light or magnetic, I'm sure you need some sort of amplifier to get up to the signal level that is needed to the count. Hope this helps. PETEC
Digital Tachometer
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