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Topic: Need help deciding which board to use for project. (Read 379 times) previous topic - next topic

Yigiter007

I'm relatively new to Arduino and microcontrollers and I have a project where I have a GLCD (https://www.sparkfun.com/products/9351) and  bunch of sensors and buttons and I wasn't sure whether I could use a

Arduino Pro Mini 328 - 3.3V/8MHz (https://www.sparkfun.com/products/11114)
or
Arduino Pro Mini 328 - 5V/16MHz (https://www.sparkfun.com/products/11113)

I know the differences between the two, but I don't know how much processing power/load components have. If i could use the 3.3V/8MHz one I could use a LIPO battery without boosting it and save on battery life too, I just don't want it to lag or give errors with or anything with the GLCD (https://www.sparkfun.com/products/9351) or the sensors. Can someone tell explain to me when i need to use the 5V/16MHz and when the 3.3V/8MHz will suffice? Thank you in advance.

#1
Feb 09, 2014, 07:19 pm Last Edit: Dec 11, 2014, 04:25 am by Coding Badly
Friend...hello.... If you are a newbie in Arduino. I highly recommend you to use Arduino Uno just for few projects..Coz there are millions of projects offered in Internet with that blue device.Besides it is the standard board of Arduino. It really helps you familiarize Coding part and interfacing sensors and actuators.

http://www.instructables.com/tag/type-id/category-technology/channel-arduino/

http://letsmakerobots.com/

few sites which offer good start and resources buddy....Hope it helps....!!!

Yigiter007

I've been using an Arduino UNO R3 and have done dozens of example problems and my own projects and I want to make a project I have into a finished product with its own board. I just don't know what the limitation are of the 8MHz and compared to 16 MHz.

GlennM

Well, the specs for the LCD are for 6-7V to drive it. So you'd have to step up a Lipo just to drive the LCD.  What are the power requirements for the sensors?

That said, I've only got experience with the 5V micro.  I've been happy with it. But I've been using 6 AA batteries (9V) to drive it and stepping that down to 5V to drive some LEDs.

Paul__B

Unless you need to do serious math or process really fast inputs, the low voltage version would probably do fine in that regard, but as GlennM points, out, the display expects 6 to 7 volts and you would need a voltage booster anyway and if you were to save power, one which can be turned completely off.  In addition, this display uses a backlight which consumes more power than anything else.

Interestingly, the LCD displays, other than those designed for mobile phones, if they are to run from 3.3V contain their own "charge pump" to generate the 4.5V that the display itself requires.

Yigiter007


Unless you need to do serious math or process really fast inputs, the low voltage version would probably do fine in that regard, but as GlennM points, out, the display expects 6 to 7 volts and you would need a voltage booster anyway and if you were to save power, one which can be turned completely off.  In addition, this display uses a backlight which consumes more power than anything else.

Interestingly, the LCD displays, other than those designed for mobile phones, if they are to run from 3.3V contain their own "charge pump" to generate the 4.5V that the display itself requires.



Here are the part I am using for my project

GLCD (https://www.sparkfun.com/products/9351)
Temperature Sensor TMP36 (https://www.sparkfun.com/products/10988)
Pulse Sensor (https://www.sparkfun.com/products/11574)
Carbon Monoxide Sensor - MQ-7 (https://www.sparkfun.com/products/9403)
Air Quality Control Sensor MQ135 (http://www.futurlec.com/Gas_Sensors.shtml)
SUPER BRIGHT WHITE, SUPERFLUX LED (http://www.allelectronics.com/make-a-store/item/LED-918/SUPER-BRIGHT-WHITE-SUPERFLUX-LED/1.html)
Polymer Lithium Ion Battery - 2000mAh (https://www.sparkfun.com/products/8483)

Recently added parts

Power Cell - LiPo Charger/Booster (https://www.sparkfun.com/products/11231) To power 5V sensors and GLCD
Pro Micro - 3.3V/8MHz  (https://www.sparkfun.com/products/12587)

Is it safe to run a display at 3.3V? Can it be done with the one I have?

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