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Arduino + power reqs for keypad, 2 led's, 20x4 RGB LCD
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Arduino + power reqs for keypad, 2 led's, 20x4 RGB LCD

by flaagan on Tue Jul 23, 2019 3:29 am

Looking to provide a friend with a programming challenge, so I'm putting together a number pad, a small display, and a pair of LEDs. Idea is that he has to program it so that the end user has to put in two correct number sequences, each correct sequence lights up the RGB LCD green and turns on one of the two LEDs, while an incorrect number just flashes the RGB LCD red.

As such, the buy list currently consists of:
- 3x4 Matrix Keypad (https://www.adafruit.com/product/3845)
- RGB Backlit negative LCD 20x4 (https://www.adafruit.com/product/498)
- Plastic mounting plate (https://www.adafruit.com/product/275)
- Halfsize breadboard w/ wiring kit (https://www.adafruit.com/product/3314)

The LED's we already have on hand.

It looks like the right choice beyond this would be:
- Adafruit Metro 328 fully assembled (https://www.adafruit.com/product/50)
- 9 vdc power adapter (https://www.adafruit.com/product/63)

Would those last two be the right choice, and would anything else be recommended?

edit - due to my friend's enthusiasm for the project idea, would like to also add a small speaker / buzzer to the project, so recommendations for that would be appreciated as well.

Additionally, for this assembly to run on battery power for an extended period (potentially several hours), what would be a recommended battery pack?

Thanks in advance for any help you can provide!

flaagan
 
Posts: 10
Joined: Sat Dec 24, 2016 5:31 pm

Re: Arduino + power reqs for keypad, 2 led's, 20x4 RGB LCD

by adafruit_support_mike on Wed Jul 24, 2019 1:14 pm

The Metro 328 is our Arduino-compatible board, so it should be easy to work with. It can easily run the external devices you mentioned and a small external speaker.

For standalone wall power, the 9V regulator is a good choice.

For audio, you can use a piezo speaker like this:

https://www.adafruit.com/product/1740

and a 6xAA battery pack should be able to run the system for several hours:

https://www.adafruit.com/product/248

adafruit_support_mike
 
Posts: 59116
Joined: Thu Feb 11, 2010 2:51 pm

Re: Arduino + power reqs for keypad, 2 led's, 20x4 RGB LCD

by flaagan on Wed Jul 24, 2019 4:11 pm

Great, thanks!

flaagan
 
Posts: 10
Joined: Sat Dec 24, 2016 5:31 pm

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