No Output On Channel 4-7
I have a Corona digital servo that works when I plug it into the receiver or output channel 0.
On output channel 4-7 I don't get anything.
servoMotor = constrain(APM_RC.InputCh(3), 1220, 1780);
APM_RC.OutputCh(6, servoMotor);
APM_RC.Force_Out6_Out7();
I put the variables in the serial monitor. Input channel 3 and servoMotor goes from 1220 to 1780.
The only time the servo reacts is when I plug in the power. It twitches once.
Power is from the LIPO through a BEC plugged into output channel 7. The red wire to the four ESC's are disconnected.
Replies to This Discussion
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Permalink Reply by Paul Thompson on -
I too have had difficulty with digital servos, only getting some twitching on startup and very erratic occasional servo movement. With standard servos there is no problem. May be an issue with the current draw of the digital servos causing a brownout on the board.
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Permalink Reply by Sebastian Gralla on -
you have to uncomment
#define IsAM
because it tries to toggle these outputs
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ModeratorPermalink Reply by John Church on -
// #define IsAM
If it hasn't been done, I agreee w/ Sebastian. I can vouch for APM's ability to run digitals with sufficient BEC/supply, as my cam stabilization ran 2 Airtronics 94761's without a hitch.Let us know what you determine!
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Permalink Reply by Dean Lamborn on -
Thank you Sebastian. All four outputs are tied to digitalWrite for LED's with isAM.
The servo works with #define IsAM commented.
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JDronesPermalink Reply by Jani Hirvinen on -
Yes if you have IsAM activated and OUT4-7 pins in use on ArduUser.h file, camera servoes won't work. So either uncomment IsAM and/or change ArduUser.h
/* AM PIN Definitions */
/* Will be moved in future to AN extension ports */
/* due need to have PWM pins free for sonars and servos */
#define FR_LED 3 // Mega PE4 pin, OUT7
#define RE_LED 2 // Mega PE5 pin, OUT6
#define RI_LED 7 // Mega PH4 pin, OUT5
#define LE_LED 8 // Mega PH5 pin, OUT4
/*
#define FR_LED AN12 // Mega PE4 pin, OUT7
#define RE_LED AN14 // Mega PE5 pin, OUT6
#define RI_LED AN10 // Mega PH4 pin, OUT5
#define LE_LED AN8 // Mega PH5 pin, OUT4
*/to be:
/* AM PIN Definitions */
/* Will be moved in future to AN extension ports */
/* due need to have PWM pins free for sonars and servos */
/*
#define FR_LED 3 // Mega PE4 pin, OUT7
#define RE_LED 2 // Mega PE5 pin, OUT6
#define RI_LED 7 // Mega PH4 pin, OUT5
#define LE_LED 8 // Mega PH5 pin, OUT4
*/
#define FR_LED AN12 // Mega PE4 pin, OUT7
#define RE_LED AN14 // Mega PE5 pin, OUT6
#define RI_LED AN10 // Mega PH4 pin, OUT5
#define LE_LED AN8 // Mega PH5 pin, OUT4
(yes i know later ones have wrong pin marking on their comments)
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