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Unattended Photography of Birds

By Tony Turner

When the  Canon G2 was released in 2001, its resolution of 4 Megapixels made it  ideal for photographing birds in the wild. The 32 Mb Compact Flash (CF) card could store 30 or 40 high resolution images.

Breeze Systems  quickly released a program called “G2Remote” (and a later version "PSRemote" which could control the G2 from a laptop computer via a USB connection to take images. The settings chosen were to take an one image every ten seconds and store them directly onto the laptop's hard disk. This could continue until the laptop's battery ran out or the G2's battery ran out. It was possible to store 500 or 600 images in a session.


In the last year or two, dramatic increases in the capacity of CF cards, first to 1Gb and then to 2 Gb meant that a full session's images could be stored in the G2, and if a method could be found to trigger the camera, the laptop would become unnecessary.

The Canon G2 (and subsequently the G3 and G5) has an infra-red wireless remote hand-held trigger which sends a series of pulses, unique to Canon, which are received by a sensor in the front of the camera and activate the shutter.


We dismantled some of these triggers, cut some of the tracks on the printed circuit and soldered  them to timed relays so that they were activated every ten seconds. Pointed directly at the receivers on the cameras, they were effective at up to two metres from the cameras.

Home-made remote control for Canon G2, G3 and G5

iThumb

Version 1 2008

The relays required 12Volts and the triggers required 3Volts, so each device required ten batteries.

Automatically takes photos every 10 seconds saving images to the Compact Flash Card (CF).
Note the G2 camera has a limit of 2 Gb cards.

 
   

The iThumb needs to be setup to ensure the the sensor on the front of the camera detects the pulses.

Version 2 2008


After months of experimenting and asking questions on the internet, we discovered the exact values and timing of Canon's pulses. We could now write a program for a Programmable Integrated Circuit (PIC) to generate and time the pulses, superimpose them on a carrier and activate the Infra-red diode directly every ten seconds, and do away with the timer, relay, trigger, and all those batteries. The PIC chosen was the Picaxe M08. The whole device fits into a switched battery box which is designed to hold four AA cells. Three of the compartments hold AA cells and the fourth holds the electronics. The assembly is small and light enough to fit into the camera's hot shoe with the infra-red diode pointing downwards towards the camera sensor from a distance of a few centimetres.





PICAXE-08M microcontroller chip. Supports 5 input/outputs
including 3 analogue inputs.

The PicAxe has only 255 bytes for code.



Version 2a

    PicAxe programmed to takes photos every 10 seconds.

    With the Canon G2 battery life and filling a 2 GB CF card, this provides 2 hour photo session
.

 

PICAXE-08M with two resistors, one diode, and one Darlington transistor.
 

The PicAxe fits in the 4th space for a battery

The electronics bit has been removed and turned on its side.

The blue dome (lower lefet) is the infra-red diode which points out the bottom of the box.


 

This is the unit with its lid removed.

The electronics is in the left-hand battery compartment. The PIC is plugged into the eight-pin socket at the top, there are two resistors, one diode, and one Darlington transistor.



 

Fits into the flashshoe, thereby turning off the flash.
simple for setup as camera's sensor is directly under the downaward pointing  iThumb infra-red diode


 

Version 2b

   

The G2 can accept pulses more frequently than every ten seconds, but is not always predictable. It seems to store images on the CF card fairly regularly then pause a bit then resume taking images. We reprogrammed the PIC to send out pulses every half-second instead of every ten seconds so that the G2 would accept a pulse as soon as it had disposed of each image, and was thus able to average an image every five seconds.





piThumb

Using PIR motion detector with LEDS

Version 3a 2009

The overwhelming numbers of images available daily was becoming impossible (more than 900 images per camera per session), so it was necessary to find a method of taking images only when a bird was present. There is a nightlight available on eBay from China that has a Passive Infra-red Receiver (PIR)  that senses a moving human body and turns on six white LEDs to illuminate doorways or stairs or so on. Suitably shrouded, (in this case using a  stubby drink holder with a slot cut in the base) this device can be triggered by a  moving bird. One of the six LEDs is removed and the voltage that had been applied to it is instead diverted to an input pin on the Picaxe.  A radical bit of reprogramming has the PIC idling until it senses a signal from the PIR, when it sends pulses to the camera for one minute, then idles again until the next bird movement.

Using a Passive Infrared  (PIR)  motion detector - the PicAxe isprogrammed to take one minute of photos (approx 12) each time motion is detected.


 
 
 

PIR motion detector



PIR sourced from eBay.



The PIR suitably shrouded, (using a black stubby drink holder with a slot cut in the base).
One of the six LEDs is removed


The Passive Infrared  (PIR)  motion detectors  have been setup for different purposes

1. PIR with switch

2 PIR's to trigger the one camera
1 PIR to trigger two camera


 
 
 

2. PIR with clamp

For a quick and simple setup to be clamped to tripod

The Canon G2 with PiThumb and PIR (enclosed in black drink holder)  clamped to the tripod with its rain hat (kitchen plastic container)

2. PIR mounted in wood

For camouflague, to less instrusive on the birds.



The modified PIR is clamped  to the tripod with a cable to the PiThumb.

 
The Canon G2 with PiThumb and PIR (enclosed in black stubby drink holder) clamped to the tripod.

Kitchen plastic containers were painted for camouflague and to protect the cameras from rain.

The PiThumb Setup for sideview of Big Mound
Canon G2 camera with PiThumb under its rain hat.
Small tripod strapped using computer cable ties to wooden tomato stakes.
The PIR close to the mound.
The mounds had twigs placed on the top to be a quick check if the male had come to the mound during the photo session.


Version 3c (July 2009)


PicAxe programmed to take photos for 30 seconds at setup then for each motion detected, photos every 3 -4 seconds for 10 minutes. This has allowed for photos sessions of  > 7 hours.
If no PIR is connected then PicAxe
to send out pulses every half-second thereby contiunous shooting (< 2 hours limit per session)

Using PIR motion detector - Door Chimes

Version 4 Modified Doorbell.

The Canon and Pentax DSLRs have no comparable hand-held remote. A solution here was a wireless PIR doorbell, also from eBay. The doorbell unit has a PIR that can be triggered by a bird, and this  wirelessly activates the chime unit which can be twenty metres away. The chime speaker is disconnected and its voltage signal diverted to a Picaxe which is programmed to close a solid-state relay twelve times in one minute. This relay activates the DSLR shutter  via its wired, plug-in remote.



The unit on the left is the PIR which senses movement using the translucent window near the top. It sends a signal wirelessly to the receiver on the right and normally plays a tune through its speaker.


Sourced from eBay





Remote Control for The Canon 350D and Canon 450D

Phottix Timer

equivalent of the Canon TC-80N3 timer remote, but a lot cheaper.
 
 

Source: eBay



Reference http://gethinhill.net/2008/08/equipment-review-phottix-dslr-timer-remote


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