Hi, I am also looking for help on use of servo motors. I have 2 MG946Rs and I could set up a circuit that connects them to an Arduino Uno board (not Uno R3 board). I also have a code that when I upload, it allows me to control the 2 servo motors. When I connect my laptop to the Arduino Uno and the Arduino Uno to these 2 servo motors, the servo motors run.
The problem is my power supply is from a laptop (i.e. 5V) and I understand that it is not a safe option to plug my laptop to the Arduino Uno, then Arduino Uno to the 2 MG946Rs (because of the currents drawn). If I use an external power supply to power these 2 MG946Rs, how do I connect them in such a way that the servo motors run according to what I have programmed in the Arduino Uno ?
Your post has been moved to its own topic.
In future do not hijack topics with different questions
- Connect the servos to their own power supply using their normal power lines
- Connect the servo power supply GND line to GND on the Uno
- Connect the servo data lines to their Arduino pins as usual
Please clarify exactly which Uno board you are using
It's a maker Uno board. How much difference is this compared other Uno boards ?
In other words, there will be 2 power supply lines, with the servo motors have their own power supply lines. If I do not want the Arduino Uno to draw power from the laptop, instead draw from another 5V power source, can I have a circuit that uses a 9V battery set up as a voltage divider (to bring down to 5V) and supply current to the Arduino Uno ?
I don't know what that is. Can you please provide a link to it ?
If it is a Uno clone, which it sounds like it is, then it should behave like a Uno
The Uno will not care where its power comes from as long as it is at the right voltage and can supply enough current
You can't use voltage divider to supply current to arduino.
And arduino is totally happy with 9V voltage supplied to VIN pin (if current is sufficient).
Yes it is a Uno clone. And yes, I am trying to address both voltage and current requirements.
If we say we cannot use a voltage divider method to supply voltage and current to Arduino Uno or clones, what is the reason ? Is it because it is not possible to find connecting cables to complete the circuit from the power source to Arduino board or something else ?
Because a voltage divider will produce a voltage that is dependent on the current draw of the load. Therefore it will not be stable voltage that is supplied to the circuits, which is a very very bad idea.
Use a voltage regulator instead,they are made for the job.
This is what a loaded voltage divider looks like from an electronic point of view
Thanks!
So has your problem been solved?
The Maker Uno is an interesting board with some nice features. The down side is there is no on-board Vin regulator.
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