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  • in reply to: Higher motor voltage? #9128
    Dr_Alex
    Participant

    Thanks for that. In the first picture you posted, to me it looked like a component was added next to the motor controller, but now I can see it was just the header pins you had soldered in for connections!

    I was wondering if the current is still limited to 1.5 A. I pressume it will be, as from the data sheet it says it is internally overload protected. Does the chip need a heatsink though, when running with the extra voltage?

    in reply to: Inter-crumble communication #9061
    Dr_Alex
    Participant

    That would be great, a “Crumble Cluster” 🙂

    Also it would be good if we could attach USB sticks to the port to read/write data files, or an SD card could be attached to the I2C of the Crumble chip. Can you imagine a Crumble data logger project, for example: A little Crumble bot travelling around, building a map of its surroundings, written to a file…recording sensor readings…

    There could also be two types of Crumble, a basic one with 4 i/o ports and a bigger version with 8 ports. Plus, having all 10 bits of the ADC would be nice…

    The Crumble project has awesome potential, it is so much easier to use than the Arduino, but it does need to be made more capable than it is at the moment – which is possible with a little work!

    in reply to: Power to the Crumble! #9060
    Dr_Alex
    Participant

    Had a look at the battery current draw when one of the Poundland £1 1200 mAh USB power packs is not being used to power anything.

    I had a pack where the cell inside had died and I had a spare cell, so before soldering it in I put a multimeter in the circuit.

    It measured 1.5 mA from the cell to the DC/DC converter board, without any USB device connected. So that should give you an idea of how long one will last in standby mode.

    in reply to: Higher motor voltage? #9059
    Dr_Alex
    Participant

    Nice mod, can you post a circuit diagram?

    in reply to: Sound please help!!! #8990
    Dr_Alex
    Participant

    Try setting one of the outputs high, then low then high again in a cycle with a wait of msec in between. Feed the output into an audio amp, eg one of those cheap powered speakers. That will give you a tone, to change the frequency, vary the wait time. The wait time can be a variable, so you could set it to change depending on the input conditions. You could even set the wait time as dependent on an analogue input.

    However, the minimum wait time is a little bit less than 1 msec, which can be achieved using some maths and a variable, as the shortest wait block is only 1 msec. This limits your max frequency to just over 1kHz.

    Another option would be to use the Crumble to trigger an mp3 player or something…

    Hope that helps.

    in reply to: Power to the Crumble! #8691
    Dr_Alex
    Participant

    Here is the full post as a PDF 🙂

    in reply to: Quick Question. Multiple Threads?? #8652
    Dr_Alex
    Participant

    The Crumble doesn’t support multi threading as far as I know. I don’t think this was changed in the last update.

    in reply to: Crumble Controlled Motorised Pots #8640
    Dr_Alex
    Participant

    I’ve played around with this project a bit more and added a second pot (but with the motor not attached) connected to another input. With this little programme, you can move the slider on this input pot and when you make A go high, the Crumble moves the motorised pot to the same position as the input pot 🙂

    in reply to: Crumble Display #8633
    Dr_Alex
    Participant

    A display option would be great! I’ll look out for it.

    I didn’t know that about the variables value, I’ll have to try it. I normally disconnect the USB when operating as I’ve sometimes found the Crumble acting in a strange way if left connected.

    in reply to: Subroutines? #8498
    Dr_Alex
    Participant

    If it can be done, it would be fantastic to have sub routines and would make the Crumble a much more powerful device.

    in reply to: Crumble Controlled Motorised Pots #8495
    Dr_Alex
    Participant

    Here are some pics…see the divisions I marked, 1 cm corresponds to a voltage change of about 0.5 V. Yellow wires go to the motor, brown to the pot connections. The USB brick gives a good 5V supply.

    The simple code in this example waits for A to go high. Then if the slider is less than 2 cm from the bottom end, the motor moves it to the 8 cm position, waits 5 sec, then takes the slider back to the 2 cm position.

    in reply to: Basic functioning #8403
    Dr_Alex
    Participant

    Sounds like a power issue. Put a multimeter on the output from the battery pack to make sure you are getting at least 4.5 V. Connect up the Crumble and check the voltage at the +/- connectors of the Crumble.

    in reply to: Distance Sensor- variables #8324
    Dr_Alex
    Participant

    The distance sensor needs a good 5V supply to work reliably. I no longer use the 4.5V Crumble battery pack, it’s not reliable enough with the distance sensor, especially if driving motors at the same time.

    I use a Poundland, £1 lithium battery pack and hack the USB cable by removing the micro USB plug and putting crocks on instead. Works great. Two can be connected in parallel if you need more current.

Viewing 13 posts - 1 through 13 (of 13 total)