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This sketch demonstrates how to use <SoftRcPulseIn> library to get RC pulses from a receiver and to use <SoftRcPulseOut> library to drive 2 servos.
The first servo will follow the order, and the second one will have a reverted motion.
Please notice this sketch is fully asynchronous: no blocking functions such as delay() or pulseIn() are used.
Tested on arduino UNO, ATtiny84, ATtiny85 and Digispark rev2 (Model A).
RC Navy 2013
#include <SoftRcPulseIn.h>
#include <SoftRcPulseOut.h>
#include <TinyPinChange.h> /* Needed for <SoftRcPulseIn> library */
#define RX_CHANNEL_PIN 2
#define SERVO1_PIN 3
#define SERVO2_PIN 4
#define LED_PIN 1//1 on Digispark rev2 (Model A), change to pin 0 for Digispark rev1 (Model B), change to 13 for UNO
#define LED_HALF_PERIOD_MS 250
#define PULSE_MAX_PERIOD_MS 30 /* To refresh the servo in case of pulse extinction */
#define NOW 1
#define NEUTRAL_US 1500 /* Default position in case of no pulse at startup */
enum {NORMAL=0, INVERTED, SERVO_NB}; /* Trick: use an enumeration to declare the index of the servos AND the amount of servos */
SoftRcPulseIn RxChannelPulse; /* RxChannelPulse is an objet of SoftRcPulseIn type */
SoftRcPulseOut ServoMotor[SERVO_NB]; /* Table Creation for 2 objets of SoftRcPulseOut type */
/* Possible values to compute a shifting average fin order to smooth the recieved pulse witdh */
#define AVG_WITH_1_VALUE 0
#define AVG_WITH_2_VALUES 1
#define AVG_WITH_4_VALUES 2
#define AVG_WITH_8_VALUES 3
#define AVG_WITH_16_VALUES 4
#define AVERAGE_LEVEL AVG_WITH_4_VALUES /* Choose here the average level among the above listed values */
/* Higher is the average level, more the system is stable (jitter suppression), but lesser is the reaction */
/* Macro for average */
#define AVERAGE(ValueToAverage,LastReceivedValue,AverageLevelInPowerOf2) ValueToAverage=(((ValueToAverage)*((1<<(AverageLevelInPowerOf2))-1)+(LastReceivedValue))/(1<<(AverageLevelInPowerOf2)))
/* Variables */
uint32_t LedStartMs=millis();
uint32_t RxPulseStartMs=millis();
boolean LedState=HIGH;
void setup()
#if !defined(__AVR_ATtiny24__) && !defined(__AVR_ATtiny44__) && !defined(__AVR_ATtiny84__) && !defined(__AVR_ATtiny25__) && !defined(__AVR_ATtiny45__) && !defined(__AVR_ATtiny85__)
Serial.print("SoftRcPulseIn library V");Serial.print(SoftRcPulseIn::LibTextVersionRevision());Serial.print(" demo"); /* For arduino UNO which has an hardware UART, display the library version in the console */
ServoMotor[NORMAL].attach(SERVO1_PIN); /* enumeration is used a index for the ServoMotor[] table */
ServoMotor[INVERTED].attach(SERVO2_PIN); /* enumeration is used a index for the ServoMotor[]table */
void loop()
static uint16_t Width_us=NEUTRAL_US; /* Static to keep the value at the next loop */
/* Receiver pulse acquisition and command of 2 servos, one in the direct direction, one in the inverted direction */
ServoMotor[NORMAL].write_us(Width_us); /* Direct Signal */
ServoMotor[INVERTED].write_us((NEUTRAL_US*2)-Width_us); /* Inverted Signal */
SoftRcPulseOut::refresh(NOW); /* NOW argument (=1) allows to synchronize outgoing pulses with incoming pulses */
RxPulseStartMs=millis(); /* Restart the Chrono for Pulse */
#if !defined(__AVR_ATtiny24__) && !defined(__AVR_ATtiny44__) && !defined(__AVR_ATtiny84__) && !defined(__AVR_ATtiny25__) && !defined(__AVR_ATtiny45__) && !defined(__AVR_ATtiny85__)
Serial.print("Pulse=");Serial.println(Largeur_us); /* For arduino UNO which has an hardware UART, display the library version in the console */
/* Check for pulse extinction */
/* Refresh the servos with the last known position in order to avoid "flabby" servos */
SoftRcPulseOut::refresh(NOW); /* Immediate refresh of outgoing pulses */
RxPulseStartMs=millis(); /* Restart the Chrono for Pulse */
/* Blink LED Management */
digitalWrite(LED_PIN, LedState);
LedState=!LedState; /* At the next loop, if the half period is elapsed, the LED state will be inverted */
LedStartMs=millis(); /* Restart the Chrono for the LED */