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  • Easy ultrasonic 4-pin sensor monitoring (hc-sr04)

    Sorry no. The so called echo is not an echo of the transmitted pulse. Also the transmitted pulse is fixed at 8 cycles at 40kHz. The echo line goes high when the pulse is sent and stays high until the first echo is received. So distance is measured from the duration of the echo pulse. The arduino devices are however a cheap source of ultrasonic Tx/Rx. Also the LM324 quad amp that is used to detect the return might be used to monitor the received signal without too many mods. There is a very good analysis of the HC-SR04 at:http://uglyduck.ath.cx/ep/archive/2014/01/Making_a... Mike

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  • Arduino: Stepper Motor Example Sketch Fixed

    Arduino have set a standard and given examples and made them public and freely available. It is ridiculous to expect them to change their standard because a third party manufacturer is stupid/ignorant enough to make a device that does not comply. If Arduino were to change their standard then the good suppliers whos products do comply would then not work. There is always the option for any supplier to make a new device and supply a library and examples as to how it can work. Arduino have gone to some lengths to show how this can be done. The onus is on any supplier who says their product works with Arduino to make sure that it does, and if a change in standard is required to provide the necessary information. Your suggestion is like expecting Ford to change their wheel sizes becaus...see more »Arduino have set a standard and given examples and made them public and freely available. It is ridiculous to expect them to change their standard because a third party manufacturer is stupid/ignorant enough to make a device that does not comply. If Arduino were to change their standard then the good suppliers whos products do comply would then not work. There is always the option for any supplier to make a new device and supply a library and examples as to how it can work. Arduino have gone to some lengths to show how this can be done. The onus is on any supplier who says their product works with Arduino to make sure that it does, and if a change in standard is required to provide the necessary information. Your suggestion is like expecting Ford to change their wheel sizes because someone has come up with a new tyre size. I hope this arguement makes sense. Mike

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  • Arduino: Stepper Motor Example Sketch Fixed

    1] You are not being reasonable complaining about Arduino code not working with the stepper hardware you bought. The onus should be with the hardware supplier to ensure compatibility or advise changes (wiring or code) to enable their hardware to work with Arduino.2] Half stepping doubles the number of steps. It does not square it. There is also a system called micro-stepping that significantly increases the resolution. You might correct your article to avoid misleading beginners.

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