Hi Sir,
This is K.Bala Chandra Kumar, working in forest department.
i would like to calculate the tree girth regarding to eucalyptus tree.
sir please help me how to calculate with the help of Ardino board.
do u want to measure the distance? if it is then u can do it with ultrasonic sensor.
you can use Photo detector with LASER or IR LEDs. mount 2 photo source parallel to each other. then measure its distance u will get the diameter.
If you had a smallish wheel ( say 100mm) on a shaft with a shaft encoder, and walked it round the trunk , you could count the impulses => circumference....
regards
Allan
This might be low tech, but if you tie a tape measure to the end of an Arduino Uno and pass it around the tree, the girth is the reading on the tape plus the length of the Uno board. This doesn't require batteries.
If your budget permits, I recommend a LIDAR attached to a servo or stepper motor that scans say 120 deg. If you stand an established distance away from the tree, say 3 meters, then your sketch can scan the tree, look for "edge" values on the LIDAR and using some trigonometry of isosceles triangles, determine the circumference. You would be able to estimate several trees fairly quickly which I presume being in a forestry department you are interested in measuring, well...a forest of trees.