2022-03-12 (Sa) RemoteFinishLine Unusable Bluetooth modules

I've been putting off the Bluetooth modules because they're not necessary for a single-point start/stop line and because they're tricky. When I used them, I had difficulty setting them up the way I wanted them to work. There are a lot of modules with various purposes, and I haven't found a guide that breaks them all down. I need a pair of modules that act as a full-duplex serial port, as though I connected a couple of Arduinos with a cable on their Rx and Tx pins.

I had a pair of matching units, and the hand-written label on the package looked like "JDK-16," but when I connected them with a USB to serial converter, they were "JDY-16," so I found the datasheet and checked out the instructions. They had a client/server mode which I recalled allowed one to connect to the other, but I suspect it was a knock-off because I couldn't change the operation style. Most of the AT commands listed in the datasheet worked, and I recorded their MAC addresses, but I couldn't get them to do much. I planned to talk to them with PuTTY, but for some reason, the terminal program wouldn't print the device's responses no matter what I did with the settings. Only the Arduino serial port monitor worked, and I still couldn't change the necessary settings. Research revealed that these weren't suitable modules but were designed to be iBeacons. I have more units to try.
Labeled but not useful here

The rest of the posts for this project 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
Completed projects from year 8

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.