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In Topic: Multiplexing with servos on the Netduino
25 November 2012 - 01:45 PM
I've never tried that, but from the software perspective you can manage to move several servos "at the same time" if you use the command "Set Multiple Targets". This works on Mini Maestro 12, 18 and 24 only.
Regarding the power, depending on the servo consumption, you have to asure at least 1000 mA per servo from an external power supply connected right away to the board.
Hope this helps.
Nico.
In Topic: Multiplexing with servos on the Netduino
09 November 2012 - 01:35 AM
Hi cyber-oleg, I got it few months ago and I must say it's really awesome! It will be suitable for you only depending on your needs because it has lot of extra features that maybe you won't need if you just want to "play with it by moving some servos around".Hi Nico, any luck trying to use 'Mini Maestro 24-Channel USB Servo Controller' with NetDuino?
I'm about to order one. Still considering. Coz, if its too complex i might get a bunch of ' Pololu Micro Serial Servo Controller's, though it will be more expensive, but not a big deal for prototyping.
Regarding its complexity, again it depends on your project and specific needs but I've found it's really easy to handle. Just put some wires between your Netduino and the Maestro (for serial Tx Rx, Vin and ground) and after some serial coding you are moving servos at will. On the other hand, pololu delivers a free tool for controlling the board via USB. It allows you not only to do some (propietary) scripting but also storing preset movements in the board's memory that you can "invoke" later via serial commands or let it to run them automatically.
Lastly, if you want to get a bunch of Maestros, the good news is that you can daisy chain them
Hope this helps.
Good luck!
Nico.
In Topic: UART - Common ground
10 August 2012 - 12:07 PM
In Topic: UART - Common ground
09 August 2012 - 11:34 AM
The MacGyver-way sounds pretty good to me at least for starting point.
I also did my research and I've found a Logic Level Converter in SparkFun that seems to meet my needs.
Thank you very much for your prompt reply!
Nico.
In Topic: UART - Common ground
09 August 2012 - 03:28 AM
Sorry for refloating this thread... I've a similar (but inverse) case.As long as the device uses TTL levels(~0 and ~5V) you are fine since the uart pins on the netduino are 5V tolerant and that resistor is not required
I need to send TX commands from my N+ to a device's RX that only supports TTL input at 5v. Having in mind that N+ only delivers 3.3v on TX, will I need to boost TX voltage up to 5v? How?
Here's the device's specs: Pololu Maestro Servo Controller.
The RX line is used to receive non-inverted TTL (0–5 V) serial bytes, such as those from microcontroller UARTs. These bytes can either be serial commands for the Maestro, arbitrary bytes to send back to the computer via the USB connection, or both. For more information about the Maestro’s serial interface, see Section 5.a. Note that the Maestro will probably be able to receive 3.3V TTL serial bytes, but it is not guaranteed to read 3.3V as high on the RX pin, so you should boost 3.3V TTL serial signals to above 4V if you want to ensure reliable operation.
I'll really appreciate your thoughts about this.
Thanks!!!
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