Jennifer Deegan
Published © GPL3+

Driving The Focus Stacking Rail Using A Raspberry Pi

The Raspberry Pi drives the focus stacking rail to achieve tiny micron movements of the camera towards the photographic subject.

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Driving The Focus Stacking Rail Using A Raspberry Pi

Things used in this project

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Code

Code to allow the Raspberry Pi to drive the focus stacking rail

Python
This code enable the Raspberry Pi to drive my focus stacking rail to achieve micron sized steps and to automatically trigger the camera after each step.
#!/usr/bin/env python

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)

#This assigns the pins of the raspberry pie to variables called "pin".
pin0 = 18
pin1 = 23
pin2 = 24
pin3 = 17

#Set these pins to send messages out rather than listen for messages coming in. 
GPIO.setup(pin0, GPIO.OUT)
GPIO.setup(pin1, GPIO.OUT)
GPIO.setup(pin2, GPIO.OUT)
GPIO.setup(pin3, GPIO.OUT)

#Zero all of the pins between tests. 
def zero_pins():
time.sleep(0.1)
GPIO.output(pin0, 0)
GPIO.output(pin1, 0)
GPIO.output(pin2, 0)
GPIO.output(pin3, 0)

#This runs the test.
def test():

count = 1
while (count < 10000):
print 'The count is:', count

zero_pins()
GPIO.output(pin0, 1)

GPIO.output(pin1, 1)
zero_pins()

GPIO.output(pin1, 1) 
GPIO.output(pin2, 1) 
zero_pins()

GPIO.output(pin2, 1) 
GPIO.output(pin3, 1) 
zero_pins()

GPIO.output(pin3, 1) 
GPIO.output(pin0, 1) 
zero_pins()

count = count + 1
test()

Github

https://github.com/BioMakers/23_Focus-stacking-system-for-gametophyte-ferns

Credits

Jennifer Deegan

Jennifer Deegan

16 projects • 6 followers
I am working on deep focus photography of specimens from 0.5mm to 2.5mm tall. I would be interested in receiving commissions.

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