This article applies to mBot Ranger.
Issue Description
一. Computer bluetooth connecttion problem
(1) Possible Causes
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If users want to connect the mBlock software directly via computer Bluetooth, it is necessary to ensure that the computer's built-in Bluetooth protocol is the standard 4.0 version, otherwise the device cannot be recognized.
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The Bluetooth module is faulty.
(2) Troubleshooting Steps
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The PC version of mBlock has restriction on the Bluetooth version of the computer. It is recommended to use the Bluetooth direct connection function of the mBlock Web version directly. This method has no restrictions: https://ide.mblock.cc/
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Please check whether the indicator light of the Bluetooth module is normal after power on. The indicator light of the Bluetooth module flashes slowly in blue after turning on, and turns to constant blue after the Bluetooth connection is successful. If the indicator light displays incorrectly in different states, you may need to replace a new module.
二. App bluetooth connection problem
(1) Possible Causes
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Bluetooth module failure.
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The mobile device does not enable Bluetooth authorization for the specific app.
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Interference from some previously uploaded programs or incorrect firmware version.
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Battery problem (battery power is too low/voltage is unstable).
(2) Troubleshooting Steps
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Check whether the Bluetooth module indicator light is normal. The indicator light of the Bluetooth module flashes slowly in blue after power on, and becomes constant blue when the Bluetooth connection is successful. If the indicator light displays incorrectly in different states, you may need to replace a new module.
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Enter the mobile device to confirm whether Bluetooth authorization is turned on (operations may differ slightly for different device models)
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iOS system: Enter the "Settings" section of the mobile device, select "Privacy", click "Bluetooth", and check whether the authorization button of the corresponding app is turned on.
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Android system: Enter the "Settings" section of the mobile device, select "Privacy Protection", click "Change Bluetooth connectivity" in "Other permissions", and check whether the corresponding app has selected to allow authorization.
3. If you have uploaded one program to mBot Ranger before, the indicator light of the bluetooth module may display incorrectly when trying to connect to the app via Bluetooth, and an error message "Firmware cannot be recognized" may appear. Please refer to the article "How to Update mBot Ranger Firmware" to refresh and reconnect.
4. If the product is currently powered a battery holder, please install new Nanfu AA batteries. If the problem persists, you can plug in a USB cable to power the product at the same time, and then test the Bluetooth connection in the App. If the connection is successful at this time, it can be verified that the problem is the battery. It is recommended to use Makeblock rechargeable battery pack.
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