How to use 15 servos with arduino mega2560 without stepping down voltage

arduinodc motormotorservo

How can I use 15 servos with arduino mega2560 without stepping down voltage?

because I want to control 15 servos by one board (arduino mega 2560).

Best Answer

I think you haven't worked with servo motors yet. They requires external power to drive the motor(as they require high current which cannot be delivered by microcontoller)

Servo motors will have 3 pins

1. +V(recommended voltage for servomotor)

2.Controlsignal(pin from microcontroller output) 

3.gnd(common gnd).

Hence there will be no point of stepping down or up the power..

Related Solutions

Electronic – arduino – Can Original Arduino Mega 2560 Work with Google ADK

You will need the arduino ADK shield
http://www.emartee.com/product/42089/Arduino%20ADK%20Shield%20For%20Android
This works with all kinds of arduinoes :)

Electronic – arduino – SoftwareSerial on Arduino Mega

The reason behind the discrepancy in documentation is that the documentation refers to two different versions of the software and it is out of date.

In Arduino version 0023 and below, SoftSerial was a very basic library written by David Mellis. It just uses millis(), digitalRead/Write and blocks when sending or receiving. This means it can work on any pin. However, it works badly and slowly. I would strongly recommend avoiding this.

In Arduino version 1 and above, SoftSerial was replaced with NewSoftSerial. This uses interrupts and timers, and is far more efficient. This limits the pins that it can work on though to ones that have pin change interrupts.

With respect to the contradictory pins; there are two types of interrupt pin on the ATmega2560 - external interrupts (INT7 - INT0) and pin change interrupts (PCINT23 - PCINT0). External interrupts are more complex and can be configured to trigger on rising and/or falling edges. Pin change interrupts trigger as long as any change occurs.

The long list of:

10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

are pin change interrupts which are what are required for NewSoftSerial (called SoftSerial in Arduino 1.0 and above).

The short list of:

2 (interrupt 0), 3 (interrupt 1), 18 (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21 (interrupt 2).

are external interrupts.

You can see these on the pin mapping diagram for the ATmega2560 (which is correct, AFAIK). Function of the interrupt pins is described on page 105 onwards of the datasheet.

There are 4 hardware USARTs on the ATmega2560. These are far easier to use and far more efficient than any software serial library. They are on pins 0/1, 14/15, 16/17, 18/19.

There is also AltSoftSerial which is better than NewSoftSerial in terms of performance, but is even more limited in pin choice.

At this stage, I have to ask "why those pins?". Could the design not change?

Best Answer

Related Solutions

Electronic – arduino – Can Original Arduino Mega 2560 Work with Google ADK

Electronic – arduino – SoftwareSerial on Arduino Mega

Related Topic