Digital signals are a pulses of a constant voltage (0 or 5v) for a given period creating an on/off digital signal.
In an analogue signal, the voltage fluctuates giving a wave form signal. This wave can be made square, fluctuating above and below zero. If you add a constant carrier wave equal to half the total height of the square wave, you now have a digital signal giving 5v 0n or 0v Off pulses. This is called a Digital over Analogue signal.
I have been carrying out tests on Digital and Analogue Sail Drum Servos using Spectrum Dx5e/ar500, Stix 27hz, GWS tester and a DIY tester. All receivers can control both Digital and Analogue servos.
Is the signal coming from the receiver Analogue or Digital?
I am teaching myself to programme a microprocessor IC to control a large motor from an R/C receiver input. In my case, the joystick will control speed and direction of the motor but not the number of turns/position.
You cannot drive the motor directly from the IC due to voltage/current. A standard H-Bridge Driver IC is put between the microprocessor and motor and it is the digital signal between them that Manufacturers are calling “Digital”.
This signal is at 50Hz (10ms) for standard servos and 300Hz (1.65ms) for Digital. So Digital servos should actually be called Hi Resolution as they are 6 times faster.
All Servos are Analogue with Hi and Low Res versions.
See my full article on http://www.sailservo.co.uk/digital.html
I am I correct or is it all bo...cks?
Can anybody explain this odd effect?
I can use a servo stretcher with an analogue servo but not with a digital servo as it twitches wildly.