Keyestudio Smart Little Turtle Robot V3 Manual page 64

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The expansion board is stacked on development board, -, "+" and S pins
of LED module are respectively connected to G, 5V and D3 pins of shield.
(4) Test Code
/*
keyestudio smart turtle robot
lesson 1.1
Blink
http://www.keyestudio.com
*/
void setup()
{
pinMode(3, OUTPUT);// initialize digital pin 3 as an output.
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