1. Why can't the Ranger connect to the mBlock software via Bluetooth?
Because this method needs to ensure that the computer's Bluetooth protocol for the standard version 4.0, if the version is not right then you need to install the standard Bluetooth driver.
At present, Web version mBlock has launched the serial port and Bluetooth direct connection function: https://ide.mblock.cc/ , users can directly enter mBlock Web Version to realize Bluetooth direct connection.
2. When does the Ranger need battery replacement?
When the product is experiencing the following motor or Bluetooth related failure scenarios, consider replacing them with brand new NANFU AA batteries, or just use Makeblock 18650 rechargeable battery pack.
（1）Motor running
- The mBot Ranger's light and sound can change normally, but the wheels move slowly/stuck or even can't move; or it can't keep balance and fall over easily.
（2）Bluetooth connection
- The product can connect to the app normally when powered by USB, but fail to connect when powered by battery.
- When trying to connect to the app via Bluetooth, it shows “Firmware not recognized”, excluding the program or product firmware, power supply via USB may be successful.
3. Why does mBot Ranger move in the opposite direction?
The motor wires of the product may be connected reversely. You can swap the motor wires connected to the M1 and M2 ports on the mainboard.
4. Why can't the line follower sensor detect black path?
(1) It may be caused by intense light exposure in the surroundings. Keep the exposed line follower sensor away from the surrounding light.
(2) It may be because there is a great distance between the line follower sensor and the ground. Keep the line follower sensor less than 2cm from the ground.
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