How The Gripper Test Works

How test_gripper_angles_buttons Works

After adding the cyber:bot extension, the project uses show arrow (East) to point at the micro:bit module’s B button. 

The main loop repeatedly checks if either the A or B buttons have been pressed. If the B button was pressed since the last time it checked, the bot(16).servo_angle(30) call closes and lifts the Gripper paddles. If the A button was pressed since the last time it checked, the bot(16).servo_angle(150) call lowers and opens the Gripper paddles. 

Both servo_angle calls can be considered “set it and forget it” so the servo will hold the position it was most recently set to. Whenever a particular button is pressed, the arrow is updated to point at the other button. 

Try This

Some objects need to be lifted up and set down more carefully, like objects with narrower bases. Try modifying the test project to make the Gripper close-lift and lower-open more gradually. 

• Set the project name to test_gripper_angles_buttons_try_this. 
• Modify the project as shown below. 
• Click Download.
• Make sure the batteries and barrel plug are connected and that the cyber:bot board’s PWR switch is set to 2.
• Test by holding the B button until the gripper goes all the way up, and then holding the A button until the gripper goes all the way down and opens.