I reconnected the Bluetooth units to USB → serial modules. I saw a problem where the radio connected to my motor-connected Arduino spat out a startup message to announce when it was "Connected." Unfortunately, the letter "C" can start the calibration routine where incoming speed data gets ignored. The other radio doesn't do anything, so I can swap them and eliminate that problem. When I reenabled the debugging data on my receiving side, I only saw zeros, even when I pushed the throttle.
I wanted to see what happened when the computer wasn't part of the operation, so I programmed the built-in LED to come on when there was data on the Bluetooth's serial port. As soon as I sent a command, the light turned on, then flickered continuously. I reconnected the computer, and the behavior didn't wait for an order. I repeated the test with the transmitting module unplugged, the receiving module unplugged, and even the Arduino unplugged. The activity light changed behavior depending on where I stood and whether I moved. The data was almost always zeros. I loaded the code to another Arduino, and the problem persisted. I loaded an example sketch that monitored serial activity on both ports and behaved the same way, so the problem wasn't solely with my code.
I thought the serial port was picking up stray data, and I could add a resistor that pulls the data line high or low. I considered how the Arduino acted the same in or out of the socket and ignored the Bluetooth module, so that could be a bad connection. Sure enough, when I checked the continuity between the Arduino and the radio, I found it missing. This was a case of a cold solder joint where it looks like a good connection but isn't. I reinforced the other data line, and my serial port and indicator light acted as I expected.
That shouldn't happen
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.
2022-11-13
I wanted to see what happened when the computer wasn't part of the operation, so I programmed the built-in LED to come on when there was data on the Bluetooth's serial port. As soon as I sent a command, the light turned on, then flickered continuously. I reconnected the computer, and the behavior didn't wait for an order. I repeated the test with the transmitting module unplugged, the receiving module unplugged, and even the Arduino unplugged. The activity light changed behavior depending on where I stood and whether I moved. The data was almost always zeros. I loaded the code to another Arduino, and the problem persisted. I loaded an example sketch that monitored serial activity on both ports and behaved the same way, so the problem wasn't solely with my code.
I thought the serial port was picking up stray data, and I could add a resistor that pulls the data line high or low. I considered how the Arduino acted the same in or out of the socket and ignored the Bluetooth module, so that could be a bad connection. Sure enough, when I checked the continuity between the Arduino and the radio, I found it missing. This was a case of a cold solder joint where it looks like a good connection but isn't. I reinforced the other data line, and my serial port and indicator light acted as I expected.
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.
2022-11-13
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