MeggyJrDemo
Jump to navigation
Jump to search
Introduction[edit]
In January 2009 I built a Meggy Jr RGB kit designed by Windell Oskay (of Evil Mad Scientists Laboratory).
Standard Arduino main program:[edit]
int main(void) { setup(); for (;;) loop(); return 0; }
Simplified Meggy API (partial):[edit]
#include <MeggyJrSimple.h> EmptyScreen(); Turn off all LEDs DrawPx(x,y,color); Turn on LED (x=0~7, y=0~7, color=0~15) ( x=0,y=0 is lower left ) ShowScreen(); Copy (double) buffer array to display video array SetAuxLEDs(N); Set top LEDs: N=1:FarLeft, N=255:AllOn CheckButtonsDown(); Check which buttons currently pressed. Sets six (global) variables: Button_A, Button_B, Button_Up, Button_Down, Button_Left, Button_Right if (Button_Left || Button_Up ) ...
Regular Arduino calls still available:[edit]
delay(N); Delay execution N msec. millis(); Return current time in msec. random(X); Return random number in [0,X)
Colors for DrawPx():[edit]
0 Dark 1 Red 8 DimRed 2 Orange 9 DimOrange 3 Yellow 10 DimYellow 4 Green 11 DimGreen 12 DimAqua 5 Blue 13 DimBlue 6 Violet 14 DimViolet 7 White 15 FullOn
Simple looping using function delay()[edit]
void setup() { MeggyJrSimpleSetup(); } void loop() { DrawPx(7, 7, FullOn); ShowScreen(); delay(100); // #1 DrawPx(7, 7, Dark); ShowScreen(); delay(500); // #2 }
Same loop over frames, w/o using function delay()[edit]
unsigned long gLastTime; byte gWhichDelay; int gDelayMsec; void setup() { MeggyJrSimpleSetup(); gLastTime = millis(); gWhichDelay = 2; // Waiting at: =1: first delay(), // =2: second delay() gDelayMsec = 500; } void loop() { if ( millis() > gLastTime + gDelayMsec ) { if ( gWhichDelay == 1 ) { DrawPx(7, 7, Dark); ShowScreen(); gDelayMsec = 500; gWhichDelay = 2; } else { DrawPx(7, 7, FullOn); ShowScreen(); gDelayMsec = 100; gWhichDelay = 1; } gLastTime = millis(); } }