Let's Make Robots!

74HC595

Creating a Picaxe 08M LCD Driver ( 2 wire Driver )

A few weeks back I decided to make another attempt at driving an LCD using picaxe. My first attempt was almost a year ago, however when the $6 LCD failed to display anything I wrote it off as defective.

But after a long night where i found it hard to sleep i stumbled on a  site that should me clearly how to power up and set the contras with backlight on. 15 minutes in and i was hooked. LCD light boxes displayed as i adjusted the contrast using a 1oK pot.

My 8x16 led matrix

UPDATE:  6 Oct, 2013

Ok, I have been too lazy to update this as this was done a month or so ago. I hereby declare this project complete. It is now bigger and better! Below are some photos and a video of the completed matrix and driver board(click any picture for a larger view)-

The Matrix-

The driver board (front) -

many little motors, many power supply questions

Hi all,

 

I am new to this forum but i have stalked users of this site for sometime.

I have a project on the go that i am a little stuck on. I have come pretty far since the idea hit me many months ago but now i am at the tail end and wondering how i will power this thing.

I have been using an Arduino connected to a bunch of 595 shift registers which are then connected to 36 small dc motors via npn transistors. the motors are small mobile phone vibrating motors and i need them to run, as per datasheet, 3v @ 90ma.

 

74hc595 with 7 segment dispaly not working right

For some reason I can't get my 7 segment dispaly and 74hc595 shift register to work right on my arduino.  I can get the segment to turn on one at a time.  When I try to do numbers it just doesn't work right?  I have clock pin, and data pin to the the arduino. It will try to light up my numbers but will be missing some segments. It will also skip numbers completely for example try to show 1, 4, and 6 and skip the rest. I tried putting a 0.1 cap on the latch also.  I have 220 resister running from each pin of the display to the shift register.  Here my code:

Motor Controller Board

Well I've almost had 3 weeks offline and got a ton of thinking done.  The physical design is basically the same, going to use a PicAxe 14M to control four DC motors with two L293Ds. The picaxe will be optically isolated from the arduino, so if the motors, an IC or a wire shorts out and decides it doesn't want to go alone that it doesn't have the arduino as an option as a buddy in IC heaven or hell.