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  • robertbu commented on zaphodd42's instructable Arduino Fireflies24 days ago
  • robertbu commented on thedeveloperguy's instructable TDG-Bus2 months ago
    TDG-Bus

    I'm inexperienced with electronics, but I've used I2C in a couple of projects to communicate between Arudinos. How does this method of communication compare?

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  • robertbu followed Metalworking, Websites, Toys & Games, Fire and 81 others channel 3 months ago
  • robertbu commented on btma's instructable One Pin 4*4 Keypad10 months ago
    One Pin 4*4 Keypad

    You may want to give your detection a bit of leeway. Something like:if (abs(readvalue - 751) <= 2)Or better yet, put your values sorted in a table, find the nearest value to readvalue, and output if the value is within a threshold.

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  • Impossible Object With Fusion 360 - Box and Ball

    Are you printing this with supports?

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  • robertbu commented on SimonRob's instructable The Earth Clock1 year ago
    The Earth Clock

    This is a very cool project! I'd like to suggest some alternate pathways for the electronics. Using a transistor and base resistor you can get rid of your NE555 circuit and drive the PWM directly from the Arduino. Using a real time clock module, you can get rid of the clock kit and drive the clock directly through the Arduino also. Driving the clock through the Arduino would give you the ability to have your model track the earth/sun in real time. Adding a display for month/day (driven from the Arduino) would allow you to display the month/day/time represented by the model when you manually change the rotations of the two stepper motors. Note most 28BYJ-48 stepper motors are geared so that 2037.886 steps equals one rotation.

    Your project is done, your circuit works, and this is a well written instructable. So I'm *not* suggesting you make any changes. My suggestions are only for people to consider who want to follow your instructable. Using a transistor and the Arduino's PWM, you can still use 12V and not draw the power for the LEDs from the Arduino voltage regulator. If you bought your motor from Aliexpress, then the 2037.886 steps per revolution is very likely, but I doubt it will make any difference since your small model does not require precise positioning. A bigger source of problems is the crystal in the arduino itself (which is not precise). You may be losing/gaining hours per month on your timings. But even that is not an issue with a small model. If it were me, I would have powered everyt...

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    Your project is done, your circuit works, and this is a well written instructable. So I'm *not* suggesting you make any changes. My suggestions are only for people to consider who want to follow your instructable. Using a transistor and the Arduino's PWM, you can still use 12V and not draw the power for the LEDs from the Arduino voltage regulator. If you bought your motor from Aliexpress, then the 2037.886 steps per revolution is very likely, but I doubt it will make any difference since your small model does not require precise positioning. A bigger source of problems is the crystal in the arduino itself (which is not precise). You may be losing/gaining hours per month on your timings. But even that is not an issue with a small model. If it were me, I would have powered everything from a 1A 5V USB charger. This gets rid of your 7805 circuit.

    He is running the circuit on 12V DC, so the circuit is already DC. Note with a few changes, many of the components can be removed and the whole thing can be driven at 5V using a 1A USB wall brick.

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  • robertbu commented on DWSciSouth's instructable Iridescent Art1 year ago
    Iridescent Art

    This would be an excellent entry for the "Colors of the Rainbow" contest for the "Judges Prize for the best overall use of all of the colors of the rainbow."

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  • robertbu commented on dcolemans's instructable DIY Submersible ROV1 year ago
    DIY Submersible ROV

    Thank you very much for providing this resource! I've beencollecting ideas for a future ROV build for some time, and there are a numberof things in your build that are new to me.+Rather than holes in the PVC pipe, I'm considering fillingthe pipe with Silicone. The Siliconedensity is close to the density of water.+It is unclear how you ran your wires into the drychamber. If you ran the sheathing in aswell as the wires, you can have problems. If the sheathing around the Cat6 gets nicked, water can run into yourdry chamber in the sheath. +In some builds, the tether is given a slightly positive buoyancy. The whole tether is placed in a light meshbag. Small floats are added to the baguntil reaching a slightly positive buoyancy. The floats are then attached along the tether. This way the...

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    Thank you very much for providing this resource! I've beencollecting ideas for a future ROV build for some time, and there are a numberof things in your build that are new to me.+Rather than holes in the PVC pipe, I'm considering fillingthe pipe with Silicone. The Siliconedensity is close to the density of water.+It is unclear how you ran your wires into the drychamber. If you ran the sheathing in aswell as the wires, you can have problems. If the sheathing around the Cat6 gets nicked, water can run into yourdry chamber in the sheath. +In some builds, the tether is given a slightly positive buoyancy. The whole tether is placed in a light meshbag. Small floats are added to the baguntil reaching a slightly positive buoyancy. The floats are then attached along the tether. This way the tether does pool on thelake floor where it is more likely to be caught by something.+My ROV will be for saltwater, so I cannot get away with a wetbattery.

    "Why not just let it flood with water?" - I may be over thinking things, but I figure stuff in the water will get into the pipes...silt, small aquatic creatures, salt, etc. The light mesh bag is only used during the construction phase. The tether is put in the bag and placed in the water, float are added to the bag over time until the right buoyancy is reached. It is a simple way to figure out how many floats to add. As for the floats, I plan to 3D print some tapered, hollowish forms that clip or thread onto the tether...the shape of long lead sinkers. I'd fill the 3D shapes with foam. Interesting though on the battery test.

    I assume your battery is 12V. Do you have a general idea of the run time of your ROV?

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