ATMEGA328p Charge-Discharge LED/Capacitor

//
// Simple two-LED flasher example
//
// By Robert Jenkins, for
//
// Electro-tech-online user Athosworld
//

//
// Set L1 and L2 to the pin numbers you are using
//
const int L1 = 0;
const int L2 = 1;

void setup() {
  // put your setup code here, to run once:
 
  pinMode(L1, OUTPUT);
  pinMode(L2, OUTPUT);

}

// There are many ways to do this, but this is the simplest
// and easiest to follow - it's not intended to be most
// compact or code efficient.


void loop() {
  // put your main code here, to run repeatedly:

  // Turn one on at the start of the loop
  // (And the other off)
  // LOW is on, as the LED common is to power

  digitalWrite(L1, LOW);
  digitalWrite(L2, HIGH);

  // Wait half the cycle time,
  // eg. 500mS for a one second cycle
  delay(500);

  // Set the opposite leds ON and OFF
  digitalWrite(L1, HIGH);
  digitalWrite(L2, LOW);
 
  // Wait the other half ofthe cycle time,
  delay(500);

  // The sequence will then continue back at the start of the loop.

}

// ArduinoISP
// Copyright (c) 2008-2011 Randall Bohn
// If you require a license, see
// http://www.opensource.org/licenses/bsd-license.php
//
// This sketch turns the Arduino into a AVRISP using the following Arduino pins:
//
// Pin 10 is used to reset the target microcontroller.
//
// By default, the hardware SPI pins MISO, MOSI and SCK are used to communicate
// with the target. On all Arduinos, these pins can be found
// on the ICSP/SPI header:
//
//               MISO °. . 5V (!) Avoid this pin on Due, Zero...
//               SCK   . . MOSI
//                     . . GND
//
// On some Arduinos (Uno,...), pins MOSI, MISO and SCK are the same pins as
// digital pin 11, 12 and 13, respectively. That is why many tutorials instruct
// you to hook up the target to these pins. If you find this wiring more
// practical, have a define USE_OLD_STYLE_WIRING. This will work even when not
// using an Uno. (On an Uno this is not needed).
//
// Alternatively you can use any other digital pin by configuring
// software ('BitBanged') SPI and having appropriate defines for PIN_MOSI,
// PIN_MISO and PIN_SCK.
//
// IMPORTANT: When using an Arduino that is not 5V tolerant (Due, Zero, ...) as
// the programmer, make sure to not expose any of the programmer's pins to 5V.
// A simple way to accomplish this is to power the complete system (programmer
// and target) at 3V3.
//
// Put an LED (with resistor) on the following pins:
// 9: Heartbeat   - shows the programmer is running
// 8: Error       - Lights up if something goes wrong (use red if that makes sense)
// 7: Programming - In communication with the slave
//