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pulley project

Former Member

Hello everyone..i ve just joined element 14..hopefully looking forward to learning a lot from all the users and experts at this forum..anywayz  ve been given a project where there is a pulley which is connected to a motor..so as the motor rotates...the pulley functions and does accordingly whatever work it needs to do..the motor is set to 100 revolutions per minute..anyways..however whenever there is load shedding or whenever electricity shuts down.in the plant..the motor needs to start all over again...so through an arduino is there any way...i can tranmit data recording in serial monitor of how much rotations hve taken place..b4 the load shedding occurs..and the 2nd option which is slightly easier iam assuming..is that whenever load shedding occurs..maybe blink an led at the office or smething along dat line..stating dat load sheddign has occurs.i was thinking of RF modules..in this case...as its quite cheap..any suggestions of how can i initiate this project?? Thank You

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    Hello, if I correctly understood your question, the problem is to detect if the pulley slows down or stops, then send a signal to a control station, right ?

    If that's the question, my approach would be this: put one permanent magnet  (neodymium ones are small and powerful) on the pulley and 3 hall sensors near the pulley circumference. The magnet will pass near the hall effect switches, so you will have 3 pulses for turn (on 3 different lines). You can reach the same results using 3 magnets and one sensor, but if the sensor goes faulty, your circuit can't work anymore. Better use a single magnet (that is presumed to be almost ethernal) and 3 hall effect switches. This is the "capture" part. Now, use any small microprocessor, like Microchip PIC or Atmel AVR and one ethernet interface like the ENC28J60 from Microchip. The microcontroller must verify that the 3 hall switches inputs have the right timings and in case of problem must send a simple UDP packet thru Lan (or Wan, if you supply the address of gateway)- On the other side, any PC using a simple program to monitor packets received from a specific IP address, on a particular port, can show to the human operator that there is something wrong in the system under control. I did something similar using an Atmel ATmega48 - 4K flash (but using only UDP packets, not implementing a fully TCP stack... and without Arduino, just using pure C, like I'm accustomed to do), but it's better to start with a little more powerful micro (ATmega88 ?). I also suggest to send timed packets from the remote device (the pulley circuit) to the central service PC program, just to verify that connection is always "alive". Hope this helps... ciao

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    Hello, if I correctly understood your question, the problem is to detect if the pulley slows down or stops, then send a signal to a control station, right ?

    If that's the question, my approach would be this: put one permanent magnet  (neodymium ones are small and powerful) on the pulley and 3 hall sensors near the pulley circumference. The magnet will pass near the hall effect switches, so you will have 3 pulses for turn (on 3 different lines). You can reach the same results using 3 magnets and one sensor, but if the sensor goes faulty, your circuit can't work anymore. Better use a single magnet (that is presumed to be almost ethernal) and 3 hall effect switches. This is the "capture" part. Now, use any small microprocessor, like Microchip PIC or Atmel AVR and one ethernet interface like the ENC28J60 from Microchip. The microcontroller must verify that the 3 hall switches inputs have the right timings and in case of problem must send a simple UDP packet thru Lan (or Wan, if you supply the address of gateway)- On the other side, any PC using a simple program to monitor packets received from a specific IP address, on a particular port, can show to the human operator that there is something wrong in the system under control. I did something similar using an Atmel ATmega48 - 4K flash (but using only UDP packets, not implementing a fully TCP stack... and without Arduino, just using pure C, like I'm accustomed to do), but it's better to start with a little more powerful micro (ATmega88 ?). I also suggest to send timed packets from the remote device (the pulley circuit) to the central service PC program, just to verify that connection is always "alive". Hope this helps... ciao

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