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#ARDUINO MANAGER CODE GENERATOR MANUAL HOW TO#
How to get Technical Assistance from a Technical Support Moderator.You can set a timer to establish the poll rate, which would be determined by the number of pulses per revolution and the max expected speed of rotation.īTW this encoder looks like it’s designed for coupling to a motor, there are better units (and cheaper!) for use as digital panel pots with knobs. AVR micros have an interrupt on pin change (by port) which can be used for this rather than using two discrete interrupt inputs.Īnother way to do it is to poll the two inputs and if the new state is different from the last process as described above. Then use a state machine to read the new state of the two inputs and based on the previous state decide if the direction was forward or reverse. I wish I had a dollar for every quadrature interface example that used one of the outputs as a clock and the other as a direction! The correct way is to configure the processor with TWO interrupts, one for each pulse and to trigger on change (ie BOTH rising AND falling edges). Depending on your application, the inaccuracy may be less important than the speed or the “load” on your microcontroller (e.g., speed control applications)… In CNC positioning applications, this is unacceptable.
That means that with this input waveform, the count will always increase even though there is no net motion on the motor shaft.Īnother way to look at it is: you can have one lost count at every reversal. Rising edges of this pin will be seen repeatedly, and the “other bit” will always be 0. Now imagine that the second bit is the one being treated as a rising-edge interrupt. The shortest pattern with a reversal is 00 –> 01 –> 00 (repeating). But a reversal can happen at any time in the sequence, e.g: 00 –> 01 –> 11 –> 01 –> 00. In the other direction, the sequence is reversed: 00 –> 10 –> 11 –> 01 –> 00. For an Arduino anything above Vcc/2 (= 2.5v for a 5v Arduino) is a logic high. I think the high level spec on the LTD-001 was supposed to be Vcc - 0.7v, which makes some sense as it has a Vcc range of 5v - 24v.
THANK YOU for the help! I suspected there could be a problem with the Hi/low levels of the two MPGs I listed, (one was high and the other was high The MPG you found for me on ebay has a high level of 4.5v, which I hope is high enough for the arduino (which should be around 5v?) I ordered one tonight.
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