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Topic starter
2022-01-06 3:55 pm
Hello I have an rc car project I am hoping to be able to control my servo normally via my transmitter and receiver, but I would also like the option of controlling one or two servos onboard with a joystick or button perhaps as well. Is this possible?
2022-01-06 5:17 pm
How would you determine which source is dominant when each wants to position the servo ?
How do you plan to "share" the servo signal wire ?
Anything seems possible when you don't know what you're talking about.
Topic starter
2022-01-06 5:21 pm
Hello Will I plan on only having the option of using one or the other. Not both at the same time if this helps.
2022-01-06 5:40 pm
Yeah, that makes more sense 🙂
How about installing a spdt switch inside the car. Connect the common to the relay control input wire. Connect one of the other (switched) inputs to the onboard relay control and the second input to the wire from the R/C receiver that runs to that same relay.
That should allow you to choose which source you want to use before you power up the car without needing to do anything to your R/C controller.
Anything seems possible when you don't know what you're talking about.
Topic starter
2022-01-07 4:49 am
Great idea thanks for taking time to reply.
2022-01-08 11:39 am
Servos require PWM signal to control their positioning. (See: https://en.wikipedia.org/wiki/Servo_control) The onboard controls will need to generate these types of signals to move the servos to the desired position. There are inexpensive servo testers that could be made to perform this function. There are many around at a wide range of prices (example: Servo Tester ). Or if you are wanting to build your own search for "DIY servo tester".
Then there is the challenge of switching between the onboard signals and the ones that come from your RC receiver which as mentioned before can be accomplished with a double throw switch or gang for each channel. Or if you are going the DIY route you can incorporate the switching circuitry with the servo control circuitry.
Best of luck
Topic starter
2022-11-21 12:56 am
@ruplicator thannks for the reply. I havent tried anthing just yet. Getting the car to work how it does now has been quite a lot for me. I am running out of space in the vehicle i wanted to operate servos normally Rx/TX and also a few of the servos being capable of being controlled onboard. It is a lowrider rc car. Most real lowriders can control the hydraulics from a small box on a long cord that is then held outside the vehicle to control the hydraulics. I thought it would be neat to be able to use the hydraulics (servos) both ways. This has been a really challenging project for me, my first time using arduinio or trying to understand coding in any degree.
you can see a few short videos on www.youtube.com/@scottsrcshop
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