// 
// Endlagenschalter für Servo an einer Digital-Proportionalanlage;
// Pulsdauer 1,5ms +/-0,5ms;  Pulsabstand ist hier 14 ms (vom Sender vorgegeben).
// Servotester (Pulsgeber) einmal langsam nach links und dann nach rechts drehen. 
// Er gibt hier je 20 Pulse ab, damit erreicht das verwendete Servo +/-45°.
// Die Stromaufnahme des Servos beträgt 5,6 mA.
// Schwellen sind auf <1300 und >1700 usec eingestellt.
// Abschaltdauer für tk = 20 (*14 ms = 280 ms)
// Pins am PROMicro: 
// 		Pin 2 Pulse vom Empfänger
// 		Pin 9 Pulse an das Servo
// 		Pin GND vom Empfänger
// 		Pin VCC (5V) vom Empfänger-BEC 
// 		oder Pin RAW vom Akku

// Debug-Ausgabe über Serial Monitor:

 Servo-Endlagenabschalter
 www.gheinz.de
 für Arduino Pro Micro mit ATmega32U4
 USB-VCP Kommunikation auf TX0, RX0 mit 115200 Baud, 8n1n

 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 19
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 18
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 17
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 16
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 15
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 14
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 13
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 12
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 11
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 10
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 9
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 8
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 7
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 6
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 5
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 4
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 3
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 2
 usec_read = 1704; usec_old = 800; usec_new = 2200; t = 1
 usec_read = 1704; usec_old = 2200; usec_new = 2200; t = 0
  fertig

 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 19
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 18
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 17
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 16
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 15
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 14
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 13
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 12
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 11
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 10
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 9
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 8
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 7
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 6
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 5
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 4
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 3
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 2
 usec_read = 1296; usec_old = 2200; usec_new = 800; t = 1
 usec_read = 1296; usec_old = 800; usec_new = 800; t = 0
  fertig