2021-04-23 (F) Weekly Summary

In my head, I was going to revise the flat platform to fit my hand. I realized it would be easier to modify the finger rods instead. I updated the program to let me use a couple of variables to adjust the finger pads' depth and angle.
Revised finger rods

My test fitting revealed that I didn't want to use a single custom finger rod, but I should use a unique style for each finger. I found a good fit for each knuckle but discovered that I had trouble touching the ring finger without moving my middle finger at the same time.
Made for my fingers

The first pressure sensors I built didn't work well. I think the problem was that I pressed Velostat, a conductive plastic, into layers of itself where I should have been using a metal interface, like copper tape.
Homemade pressure sensor

I looked up someone else's pressure-sensing technique, and she recommended copper tape, so a lot of surface area touched the plastic. I laid a piece of tape under the finger rods for my project and wedged a small square of Velostat between it and a taped finger rod. My results improved.
Improved pressure sensors

Reading resistance values with a meter is different from reading analog values with a microcontroller. I decided to use a knock-off Arduino Pro Micro for this early prototype, and I'll switch to a wireless controller later.
Arduino Pro Micro

To get usable analog values, I added pull-down resistors to the circuit. I wasn't sure about which resistor to use, so I installed four and discovered that my most useful values came from low resistances, like 220Ω.
Pull-down resistors

The rest of the summary posts have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7

Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com

This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.

All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.

All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.

Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.

This blog, including pictures and text, is copyright to Brian McEvoy.