My Commentary and Technical help



From BobDavis321

Wednesday, September 15, 2021

Arduino D1 Mini Powered Watch

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 I have been working on a Arduino D1 Mini Powered Watch.  The hope is to add features like the MAX30102 for heartbeat monitoring, and an acc...
Wednesday, April 28, 2021

Two DHT11's to Arduino with OLED Display

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  In this chapter we will first introduce the 96 x 64 Full Color OLED display.   Once again I was able to get the pins to line up so that a ...
Monday, March 29, 2021

17 DOF Humanoid Robot with Robot Servos

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 I am building another humanoid robot, this time with what are called "robot", double ended, servos.  This picture is what he look...
Tuesday, March 16, 2021

Problems with 5 volt 15 amp AC Adapters

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 I have been having Problems with 5 volt 15 amp AC Adapters.  Three of them have died in the last 2 or 3 months.  I opened them up and the c...
Thursday, February 18, 2021

Working with MAX30100 and MAX30102 Blood Oxygen SPO2 Detector

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 I am working with the MAX30100 and MAX30102 Blood Oxygen SPO2 Detectors trying to get them to work.  First I bought the MAX30100 and then l...
4 comments:
Wednesday, February 10, 2021

I am working on an update to the 6DOF Servo Arm project

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 I am updating the 6DOF Servo Arm project.  The old arm had some issues.  Like the servos at the wrist position jammed on each others limiti...
Wednesday, November 18, 2020

Installing and Upgrading Solar Panels to 50 Watt panels sold on eBay

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 A few years back I bought some solar panels at a Hamfest.  I was disappointed to find out that they are only 10 watts each. By todays stand...
2 comments:
Sunday, November 15, 2020

Sony BDP-S1500 Blue Ray DVD Repair

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 I purchased a Sony BPD-S1500 Blue Ray DVD player because I had accidently bought a Blue-Ray DVD.  After about a year of occasional use, it ...
Friday, November 13, 2020

I am Rebuilding my 3D Printer with several new improvements

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I am Rebuilding my old 3D Printer with several new improvements.  The parts needed have gone way down in price.  In fact you can get a 3d Pr...
Thursday, October 8, 2020

Chevy HHR Windshield Wiper Bushing Replacement

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Recently one of the windshield wipers on my HHR stopped moving.  I removed the plastic cover and discovered that the wiper arm had become di...
3 comments:
Monday, September 28, 2020

Ode to Projectors.

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Many years ago, while visiting a church, I made the mistake of closing my hymnal, because I knew the words to the song by heart.   Far be it...
Friday, September 11, 2020

72 x 40 WS2812B Addressable LED sign with Arduino Uno and Bluetooth

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 I am making the biggest LED sign yet.  It is 4 feet wide by 2 feet tall.  It will feature 72 x 40 Addressable LED's.  That is a total o...
2 comments:
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