There may come a time when you need to determine if connection ports on either the Control or Expansion Hub are shorted. This section will walk you through how to use a common digital multimeter to see if Voltage is still being pushed through the device.
Consult your user's manual to make sure the lead connections are plugged into the correct terminals for DC voltage measurement.
In our case, we needed to turn the rotary dial to Hz V and press Function to start measuring for Voltage.
Make sure to run your code so the motor ports turn on, then touch your leads to the motor port prongs to get a voltage measurement. Since the code is asking the Control Hub to run port 0 at 100% power, if there is no damage, then we should be able to measure output voltage similar to the battery's supplied voltage.
Running the same code, the Control Hub runs port 1 at 100% power; if there is no damage, we should be able to measure output voltage similar to the battery's supplied voltage. However, when measuring motor port 1, even though my 12V battery is charged and my code is running, the multimeter isn't reading anything significant. This motor port is likely damaged, and you should contact support or purchase the .
Since a 12V Slim Battery powers the Control System, you should read a range of voltages.
Identifying a motor port that does not output voltage on a Control Hub means that something within the port's internal motor controller has been damaged. Since this port is no longer functional, it is recommended to use the or to fix your Hub.
The following questions consider common indicators of issues seen in the Control Hub. Think about the potential indicators your Hub is currently exhibiting and consider the following questions:
Is the Driver Station device unable to connect to to the Control Hub Wi-Fi?
Is the Driver Station connected to the Wi-Fi but not showing a ping or any other signs of communication?
External factors, such as local Wi-Fi environment, play a part in the ability to establish or maintain a connection between a Control Hub and a computer. Like all aspects of of troubleshooting its important to isolate an issue by asking questions and discovering the answers! As you work on troubleshooting consider the following questions:
What is your local Wi-Fi environment like?
Local Wi-Fi environment effects the consistency of a connection to the Control Hub. Use a to check the local environment for channels that are cluttered with Wi-Fi networks. to a channel with the least amount of overlap with other networks.
Are you connected to another Wi-Fi network?
Contact REV Support with details of the troubleshooting information you have collected such as the answers to the questions above and the outcome of your troubleshooting thus far. It will also help to send logs or other diagnostic data to REV Support.
External factors, such as local Wi-Fi environment, play a part in the ability to establish or maintain a connection between a Control Hub and a Driver Station device. Like all aspects of of troubleshooting its important to isolate an issue by asking questions and discovering the answers! As you work on troubleshooting consider the following questions:
Is your system operating on a 2.4 GHz band or 5GHz band?
REV recommends, if you have a dual band Driver Station device, that you operate on the 5GHz Wi-Fi band. Check out the section to learn more about making this switch.
What is your local Wi-Fi environment like?
If you are still experiencing connection issues, once you have gone through the flowchart and worked on addressing the potential root of connection issues describe in the list above, start looking for patterns in the behavior. How often does this behavior appear? Are there certain things that happen around the same time the disconnects happen? The following list provides some ideas on what sort of patterns you might see:
The Control Hub connects fine when a team member takes it home but doesn't seem to like to connect at school.
The Control Hub connects fine until you start driving the robot around.
Contact REV Support with details of the troubleshooting information you have collected such as the answers to the questions above and the outcome of your troubleshooting thus far. It will also help to send logs or other diagnostic data to REV Support.
The status LED on the Control Hub is similar to a check engine light on a car. A solid blue status LED indicates the Robot Controller is not communicating to the I/O of the Control Hub, but not what the root cause is. Updating the Control Hub to the latest version of all the software is a first step to resolving this issue, listed below are two ways to update.
The is software designed to make managing REV devices easier for the user. This Client automatically detects connected device(s), downloads the latest software for those device(s), and allows for seamless updating of the device(s). Using the REV Hardware Client allows you to perform any required updates that may be needed to recover your Control Hub. The Hardware Client can also be used to .
If you use Android Studio for coding you will need to update your Robot Controller application by creating a new Android Studio project with the most recent version of the Robot Controller APK. Information on this process can be found in .
The most common cause of a loose or wiggly XT30 port is compressed pins within the male XT30 connector on your Hub. Each pin of the male XT30 connector is made of 4 tines that should have a small amount of space between them. In the image below, the pin on the top has the correct amount of space and the bottom one is visibly compressed, however, an XT30 pin can still be too compressed even if there is visible space.
To help repair compressed XT30 pins, we recommend using an X-ACTO Knife or similar very thin blade to slightly separate the tines. Please use extreme caution when doing this repair as expanding the tines too far can cause the XT30 connector to not fit.
After slightly separating the tines, the male and female XT30 connectors should have a more secure connection.
Contact REV Support with details of the troubleshooting information you have collected such as the answers to the questions above and the outcome of your troubleshooting thus far. It will also help to send logs or other diagnostic data to REV Support.
The Control Hub produces a non internet Wi-Fi connection. Settings on the individual computer may cause the device to jump to a local, remembered network that produces an internet connection.
Are you in a school or a place of business?
In addition to the amount of local networks in an environment its important to understand what those local networks are capable of. For instance, some school districts have security measures in place that block unauthorized Wi-Fi access points. Talk to your local Wi-Fi adminstrator to find out what you need to get the Control Hub as an approved network.
Local Wi-Fi environment effects the consistency of a connection to the Control Hub. Use a Wi-Fi analyzer to check the local environment for channels that are cluttered with Wi-Fi networks. Change the Control Hubs Wi-Fi channel to a channel with the least amount of overlap with other networks.
Are you in a school or a place of business?
In addition to the amount of local networks in an environment its important to understand what those local networks are capable of. For instance, some school districts have security measures in place that block unauthorized Wi-Fi access points. Talk to your local Wi-Fi administrator to find out what you need to get the Control Hub as an approved network.
Does the the Driver Station connect to the Control Hub until a mechanism is run?
Certain mechanisms draw enough power from the Control Hub to put a strain on the battery. If you notice a drop in displayed voltage when you start a code, or when a particular mechanism is run, this may be indicative of a brown out condition. Other indicators include:
The Driver Station throwing errors about power to the system
The Driver Station making a disconnect sound
The voltage on the Driver Station showing 9 volts or lower when running code
Motors running at lower speeds then what they have been set to run
To remedy this issue check out our instructions on
Has the Status LED been solid blue for longer than 30 seconds (after start up)?
The Wi-Fi reset will down grade the Wi-Fi connection to 2.4GHz. If you have an android device with 5GHz you may want to switch the Wi-Fi Band in order to run on 5GHz. Check out the Updating Wi-Fi Settings Section to learn more about making this switch.
If the Control Hub SSID is not shown in the list of available Wi-Fi networks, try manually entering the Control Hub SSID to see if that allows you to connect.
Need help getting the Log Files to send to REV Support? See Downloading Log File for more information.
Information in this flowchart is for the initial bring up of connecting the Control Hub with a Driver Station. For issues with intermittent connection or periodic connection drops please check out the information below this flowchart.
The Wi-Fi reset will down grade the Wi-Fi connection to 2.4GHz. If you have an android device with 5GHz you may want to switch the Wi-Fi band in order to run on 5GHz. Check out the Updating Wi-Fi Settings Section to learn more about making this switch.
If the Control Hub SSID is not shown in the list of available Wi-Fi networks, try manually entering the Control Hub SSID on the Driver Station to see if that allows you to connect.
Just remember correlation does not equal causation of an event but is useful data to further troubleshooting
Need help getting the Log Files to send to REV Support? See Downloading Log File for more information.
This section is for troubleshooting a Control Hub. If you have an Expansion Hub please refer to the Expansion Hub Troubleshooting guide for help solving Expansion Hub related issues.
If you do not have a Windows 10 or higher PC, see Downloading Log File for more options on getting your diagnostic data to REV, and Updating Firmware, Updating Operating System, and Updating Robot Controller Application for steps to update the software.
The Control Hub must run version 5.0 or higher of the Robot Controller Application. If using Android Studio, make sure you are using a 5.0 or higher project.
Again, please remember that this repair needs to be done carefully, as overextending the tines of the XT30 connector can cause them to become weakened and hold their shape less. Because of the nature of this kind of damage or wear to your Hub, compressed or overextended pins are not covered under warranty.
Need help getting the Log Files to send to REV Support? See Downloading Log File for more information.
