bobdavis321.blogspot.com
My Commentary and Technical help: June 2014
http://bobdavis321.blogspot.com/2014_06_01_archive.html
My Commentary and Technical help. Monday, June 23, 2014. One Crazy Virus claimed to be from the "Metropolitan British Police". Someone showed me a computer this weekend with a virus that I could not even beat in safe mode. All I could do was to re-install Windows. The best I could do was to get the task bar to pop up for a split second. In safe mode the computer just restarts into regular mode and went back to this screen. I had to use a camera to take a picture of it. Links to this post. I work on anyth...
bobdavis321.blogspot.com
My Commentary and Technical help: April 2014
http://bobdavis321.blogspot.com/2014_04_01_archive.html
My Commentary and Technical help. Wednesday, April 30, 2014. DIY Raised Gardens in NY with very little land. Last year I started a small raised garden. I started the plants indoors in March and then moved them outdoors into two raised beds made out of 2 by 6's. Each one was about 8 feet by 3 feet in size. Last year I used egg cartons to start the plants, they were way too small! Here is what my garden looked like last year when everything was first planted outside. The peas are in the front row. Another ...
bobdavis321.blogspot.com
My Commentary and Technical help: February 2015
http://bobdavis321.blogspot.com/2015_02_01_archive.html
My Commentary and Technical help. Friday, February 27, 2015. Running a 8x40 LED Array from the Raspberry Pi. I have been trying to run one of the 8x40 LED signs from a Raspberry Pi. For some reason I am getting a lot of glitches. I know the Raspberry Pi can cause glitches when the GUI is running, but this is different. UPDATE - I fixed the glitch it was a bad ground on the ribbon cable. This is what it looks like. A glitch is happening over the letter "Y". Here is a video showing the glitching. B2 =[1,1,...
bobdavis321.blogspot.com
My Commentary and Technical help: TDA-03211C 32 inch LCD Monitor Repair
http://bobdavis321.blogspot.com/2015/05/tda-03211c-32-inch-lcd-monitor-repair.html
My Commentary and Technical help. Tuesday, May 12, 2015. TDA-03211C 32 inch LCD Monitor Repair. I was at a yard sale and I asked them about a 32 inch TV. They said it was free because the screen did not light up. It turned out to be the same model and have the same problem that I have diagnosed before. It was bad capacitors in the HV power supply for the backlight. Here is a picture of the bad 10 uF at 450 volt capacitors. Labels: LCD monitor repair. 160; . May 25, 2015 at 5:16 AM. I have SEVERAL BOOKS.
bobdavis321.blogspot.com
My Commentary and Technical help: March 2015
http://bobdavis321.blogspot.com/2015_03_01_archive.html
My Commentary and Technical help. Wednesday, March 18, 2015. Raspberry Pi and a DIY 4x4x4 LED cube. I have built a DIY 4x4x4 LED cube that I am testing with the Raspberry Pi. It is up and working, I just need some code to make it do something that is "moving". Pun intended. It is only doing fixed patterns at this point. There are currently two 74HC595's and a ULN2003 driving it. Here is a picture of the LED test program running to make sure everything works. I need to replace a bad LED and find a way...
bobdavis321.blogspot.com
My Commentary and Technical help: April 2015
http://bobdavis321.blogspot.com/2015_04_01_archive.html
My Commentary and Technical help. Tuesday, April 28, 2015. I am working on a book of LED Cube Projects. I have been working on a book of LED Cube Projects. It might end up being two books one for the Arduino and one for the Raspberry Pi. So far I have built a 4x4x5 LED cube and a 8x8x8 LED cube. Coming up next is a Color Cube likely 6x6x6 in size. Here is a picture of the 8x8x8 LED Cube from above. This first picture is of a 3D slice cutting through the cube. This next video is of "falling rain". I like ...
bobdavis321.blogspot.com
My Commentary and Technical help: Epson Powerlite 62C Repair
http://bobdavis321.blogspot.com/2015/04/epson-powerlite-62c-repair.html
My Commentary and Technical help. Thursday, April 23, 2015. Epson Powerlite 62C Repair. I recently purchased another pile of used projectors to repair and then send to Africa. However three of them need more than just cleaning. I have determined that the problem is in the optics. Basically the blue LCD is about 30-50% shot. There are lots of dark spots in a blue background. Here is what the outside of them looks like. Subscribe to: Post Comments (Atom). Favorite Vendors and Sites. EE Lab Electronics Forum.
bobdavis321.blogspot.com
My Commentary and Technical help: RAWNY Mini Hamfest Buffalo NY
http://bobdavis321.blogspot.com/2015/04/rawny-mini-hamfest-buffalo-ny.html
My Commentary and Technical help. Wednesday, April 15, 2015. RAWNY Mini Hamfest Buffalo NY. Once again this year I attended the mini Hamfest. It is just for a couple hours in the evening but you get to talk to a lot of interesting people as well as sell and buy a lot of stuff. I think I managed to leave with less stuff than what I came in with. Here is a picture of my table. I did not bring the bins from my shed this year. Here is another table or two. And here are some more tables of great stuff!
bobdavis321.blogspot.com
My Commentary and Technical help: January 2014
http://bobdavis321.blogspot.com/2014_01_01_archive.html
My Commentary and Technical help. Friday, January 31, 2014. Arduino powered Roomba Robot. I have taken a iRobot Roomba vacuum cleaner apart and made an Arduino Powered robot out of it. There is a serial port on the Roomba, but mine was dead so I wanted to do a complete rebuild. I am using a L298 motor controller IC. The Arduino is on the back right corner in the picture below. Here are the videos:. Http:/ www.youtube.com/watch? Http:/ www.youtube.com/watch? Links to this post. Thursday, January 9, 2014.
bobdavis321.blogspot.com
My Commentary and Technical help: December 2014
http://bobdavis321.blogspot.com/2014_12_01_archive.html
My Commentary and Technical help. Tuesday, December 23, 2014. DIY 3D Printer - Printing Small Parts. Here is a picture of a printed 3D hand. When I first tried to print it I had fingers flying all over the place. I even tried gluing them down to no avail! Here is what you can do to make printing small parts possible. 1 Clean the glass with a razor blade. 2 Treat the glass with acetone and/or hair spray. 3 Print a 3mm "Brim" around the base of objects. 4 Print the center or "infill" first, then the edges.