Search found 60 matches

by floresta
Sat Jun 26, 2010 9:17 am
Forum: Hardware
Topic: Arduino pins
Replies: 13
Views: 16860

Re: Arduino pins

It's so fundamental; how did anybody ever learn to use these boards?
The problem seems to be that the perpetrators of the Arduino software have been at it so long that they have forgotten that there are those who are just starting out.

Don
by floresta
Tue May 04, 2010 12:35 pm
Forum: Exhibition
Topic: New 4bit LCD library
Replies: 7
Views: 10720

Re: New 4bit LCD library

Kevin: Well I looked at your blog and found some errors, at least one of which is obviously a typo. The typo is right at the beginning - the display uses an HD44780 chip, not an HD44180. There are several places where you state that a 0x3n instruction will put the device in the 4-bit mode when in fa...
by floresta
Tue May 04, 2010 9:10 am
Forum: Exhibition
Topic: New 4bit LCD library
Replies: 7
Views: 10720

Re: New 4bit LCD library

ke9tv:

I'll look at yours if you'll look at mine.

Follow the LCD Initialization and LCD Addressing links at http://web.alfredstate.edu/weimandn.

73, Don
by floresta
Mon Feb 15, 2010 9:10 am
Forum: Connecting to BBB, RBBB
Topic: Problems with a Revison D board
Replies: 4
Views: 5973

Re: Problems with a Revison D board

Bitrex: ...the power LED will turn on when I connect a pullup resistor to an input with a normally open switch to ground. Do you mean that (1) The Breadboard power rail bus pins (V+ and GND on the side of the BBB) are not connected to the powered breadboard and (2) the pull-up resistor is connected ...
by floresta
Sat Feb 06, 2010 8:48 am
Forum: Software
Topic: usb bub setup and software
Replies: 7
Views: 12054

Re: usb bub setup and software

rep:

You may be able to get your answers by using the technique mentioned here:
and here:
Don
by floresta
Sun Jan 10, 2010 11:54 am
Forum: RBBB
Topic: External Power Problem (USB BUB is OK)
Replies: 2
Views: 5293

Re: External Power Problem (USB BUB is OK)

Will: Since your RBBB works when powered from the USB BUB it narrows the problem down pretty much to the regulator or your external supply. The only other part to consider is the 47uF input capacitor but if that were shorted the regulator wouldn't get hot. Are you sure the regulator is mounted prope...
by floresta
Sun Jan 10, 2010 11:44 am
Forum: RBBB
Topic: Idiot guide for 3.3v conversion?
Replies: 4
Views: 7538

Re: Idiot guide for 3.3v conversion?

... is there more to it than that? There's more to it than that! The oscillator frequency is rated at up to 20 MHz only when operating at 4.5 - 5V. When operating at 3.35 it is limited to 10 MHz. I understand that there are some tricks you can play by operating your chip at 8 MHz and telling the Ar...
by floresta
Sun Jan 10, 2010 11:27 am
Forum: RBBB
Topic: rbbb powers and runs off usb but not off external power
Replies: 1
Views: 4969

Re: rbbb powers and runs off usb but not off external power

If it works when you feed 5v from the USB cable it should also work when you feed 5v in from the pins you specified since they actually provide a shorter path to the IC. There is a possibility that your 7805 is oscillating. You didn't specify whether your external 7805 has the required input and out...
by floresta
Tue Dec 08, 2009 2:36 pm
Forum: Connecting to BBB, RBBB
Topic: Datalog via Serial, want no auto-reset
Replies: 6
Views: 7161

Re: Datalog via Serial, want no auto-reset

abhishekshinde: A jumper in series with the reset capacitor would work, but there's not much room on the board. One solution would be to remove the reset capacitor (next to the reset switch and the programming header) and replace it with two machined header pins cut from a strip like the one shown h...
by floresta
Sat Oct 03, 2009 7:54 pm
Forum: Hardware
Topic: Need suggestions for a project...
Replies: 5
Views: 6235

Re: Need suggestions for a project...

if there were some way to turn analog pins into digital pins
Pins A0 - A5 can also be used for digital I/O as D14 - D19.

Don
by floresta
Wed Sep 30, 2009 9:33 am
Forum: Development
Topic: New Development Board Suggestion: "USB BUB BBB"
Replies: 6
Views: 9156

Re: New Development Board Suggestion: "USB BUB BBB"

mdAndy: Sorry, I overlooked the 'Development Board' part of your heading. Paul: What I would like to see is a BBB with the analog pins turned 90 degrees so they will plug into the breadboard along with all the other pins. This would make the board only slightly longer than the BBB or Boarduino. The ...
by floresta
Tue Sep 29, 2009 5:03 pm
Forum: Development
Topic: New Development Board Suggestion: "USB BUB BBB"
Replies: 6
Views: 9156

Re: New Development Board Suggestion: "USB BUB BBB"

The whole idea of the BBB is to separate the seldom used USB circuitry from the always used microcontroller. Microcontrollers are typically used to obtain input signals from sensors and provide output signals to devices in response to those signals. In this context the only purpose of the USB interf...
by floresta
Thu Sep 17, 2009 3:51 pm
Forum: RBBB
Topic: DIP Socket
Replies: 4
Views: 8028

Re: DIP Socket

sirpoonga:

My BBB came with two 14-pin dip sockets that I installed end-to-end. These should be readily available at Radio Shack.

Don
by floresta
Thu Sep 17, 2009 9:05 am
Forum: Exhibition
Topic: GLCD Fun
Replies: 17
Views: 25599

Re: GLCD Fun

Paul: too bad I can't order up some time to try it out That was my problem when I was teaching this stuff. I thought that early retirement would be the solution but it just got worse. It was more than ten years after I retired that I finally was able to find enough time to do some recreational progr...
by floresta
Wed Sep 16, 2009 8:53 am
Forum: Exhibition
Topic: GLCD Fun
Replies: 17
Views: 25599

Re: GLCD Fun

Bill: a SET_ADDRESS command will turn into a SET_DISPLAY_START_LINE command That certainly explains it. It appears that these graphical LCDs have inherited much of the instruction set structure from the character LCDs. I wonder why they didn't stick with the old technique for identifying the specifi...
by floresta
Tue Sep 15, 2009 4:13 pm
Forum: Exhibition
Topic: GLCD Fun
Replies: 17
Views: 25599

Re: GLCD Fun

Bill: I had a lot of fun tinkering with this display. I'm glad you got me started on it. That's why I had to have 2 wires going over to the analog pins Since I'm not using the serial port I used D0 and D1 for data bits. I did initially use two of the analog pins to drive my debugging LEDs which are ...
by floresta
Mon Sep 14, 2009 9:21 pm
Forum: Exhibition
Topic: GLCD Fun
Replies: 17
Views: 25599

Re: GLCD Fun

Well it's not as neat as Bill's and I am still cleaning up the code, but here is what I have so far.

Don
by floresta
Thu Aug 27, 2009 7:57 pm
Forum: Exhibition
Topic: GLCD Fun
Replies: 17
Views: 25599

Re: GLCD Fun

bperrybap:

My display arrived today from BGMicro. Can you share some code to get me started or do I have to figure it out by myself? I generally program in AVR assembly (on a BBB) but any other assembly language or even C would help.

Don
by floresta
Wed Aug 26, 2009 2:38 pm
Forum: RBBB
Topic: Programming question.
Replies: 3
Views: 6522

Re: Programming question.

No, the clock speeds are the same - 16 MHz. Any device that is, or claims to be, Arduino compatible must run at this speed otherwise it wouldn't really be compatible.

Don
by floresta
Tue Aug 25, 2009 5:51 pm
Forum: RBBB
Topic: Programming question.
Replies: 3
Views: 6522

Re: Programming question.

Visigoth Can I pop the ATmega168 chip into the Diecimila socket, program it, and then put it back in the RBBB kit to run? That would work but I wouldn't do it too often because of the wear and tear on the IC sockets. Or do I have to buy the programming cable? If you go this route I would suggest the...