Hej Jeg har et problem med mi LED sensor. For at teste har jeg brugt dette script:
// // This example shows one way of using an LED as a light sensor. // You will need to wire up your components as such: //LED #1: // + digital2 (N side) // | // < // > 100 ohm resistor // < // | // | // ----- // / \ LED #1, 5mm, clear plastic is good (or translucent green lense) // ----- // | // | // + digital3 (P side) // ////////////////////////////////// //LED #2 (only required if you don't have the on-board LED on pin 13): // + digital13 (P side) // | // | // ----- // / \ LED #2 // ----- // | // | // + Ground // // What we are going to do is apply a positive voltage at digital2 and // a low voltage at digital3. This is backwards for the LED, current will // not flow and light will not come out, but we will charge up the // capacitance of the LED junction and the Arduino pin. // // Then we are going to disconnect the output drivers from digital2 and // count how long it takes the stored charge to bleed off through the // the LED. The brighter the light, the faster it will bleed away to // digital3. // // Then just to be perverse we will display the brightness back on the // same LED by turning it on for a millisecond. This happens more often // with brighter lighting, so the LED is dim in a dim room and brighter // in a bright room. Quite nice. // //
define LED1_N_SIDE 1 // original code uses pin 2
define LED1_P_SIDE 2 // original code uses pin 3
define LED2 13 // LED 2 is on-board or external on pin 13 and ground
// // -1 = very dark ; 1 = very bright int extreme = 0; // void setup() { pinMode(LED1_N_SIDE, OUTPUT); // N side is output or input but starts w/ output pinMode(LED1_P_SIDE, OUTPUT); // P side is alway output pin (drive low or high) pinMode(LED2, OUTPUT); } // void loop() { unsigned int waitDischarge, extenLimit; // // Apply reverse voltage, charge up the pin and led capacitance digitalWrite(LED1_N_SIDE,HIGH); digitalWrite(LED1_P_SIDE,LOW); delay(30); // // Isolate the pin 2 end of the diode pinMode(LED1_N_SIDE,INPUT); digitalWrite(LED1_N_SIDE,LOW); // turn off internal pull-up resistor // // Turn LED on if ambient light is very dark or medium if (extreme <= 0) { digitalWrite(LED2,HIGH); } // // Count how long it takes the diode to bleed back down to a logic zero for ( waitDischarge = 0; waitDischarge < 65534; waitDischarge++) { if ( digitalRead(LED1_N_SIDE)==0) { // very dark (you might need to sligthly change this number depending // on the color of the lense of LED #1 for example) if ( waitDischarge > 6 ) extreme = -1; // very bright (you might need to sligthly change this number depending // on the color of the lense of LED #1 for example) else if ( waitDischarge < 3 ) extreme = 1; else extreme = 0; break; } delay(30); // to avoid going above 65534 } // // Turn LED off if ambient light is very bright or medium if (extreme >= 0) digitalWrite(LED2,LOW); delay(200); }
Men hvorfor h...... virker det ikke???
Ledningsføringen er lavet som på diagrammet.
Håber nogen kan sige hvad der er galt!!
På forhånd tak!
knappen