Use the Map RangeClamped node.
- Value - Current number of your picked up items (0 to 30)
- In Range A - Minimum pick up items (0)
- In Range A - Maximum pick up items (30)
- Out Range A - Minimum progress bar value (0)
- Out Range B - Maximum progress bar value (1)
Use the following values:
- Value - Current number of your picked up items
- In Range A - 0.0
- In Range A - 30.0
- Out Range A - 0.0
- Out Range B - 1.0
Depending on your Value (ranges from 0 to 30) this will convert the output to range value of 0.0 and 1.0.