Home 2018 Forums Crumble Support Using an ldr with a sparkle

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    I’m helping at my local primary school and they are designing a night light using a crumble. Some of them want to use an ldr to turn it on when the light drops. We have managed to get it to work by piggy backing a crocodile clip on a power output and wiring a sparkle up using its d terminal and the other ldr clip on c but can you use the correct sparkle connection then a normal a,b,c for the ldr without piggy backing a clip? If so what would the program have to look like. My apologies I’m new to this but getting into it. Thanks for any help.

    Helen Roberts

    An LDR can be connected to any of the I/O pads (A,B,C or D). If you are using Sparkle commands, though, the Sparkle needs to be connected to D so then one leg/pad of the LDR would be connected to A,B or C and the other to a “+” pad (this could be on the battery box or the “+” output on the right-hand side of the Sparkle).

    When the LDR is exposed to light it allows the current to pass through it to the I/O pad (the input will be “high”). When the LDR is covered no current flows and the input is “low”. A diagram of the set-up and example program are attached.

    Let me know if any of this doesn’t make sense!

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