I have similar setup as this post: PWM via GPIO to trigger a MAPIR Camera

but a different camera: https://www.mapir.camera/collections/survey3/products/survey3w-camera-red-green-nir-rgn-ndvi. I am currently trying to trigger this MAPIR NDVI Camera with a PWM Signal. The camera is connected via this HDMI trigger cable. In my case, the white wire is connected to GPIO PIN 13, the black wire is connected to a grounding pin.

For the camera to trigger I need (from what I read) 2000 us PWM or 500 HZ signal.

enter image description here

Things i have tried:

import RPi.GPIO as IO
import time

IO.setmode (IO.BCM)

# We will set GPIO13 (or PIN33) as output pin. We will get PWM output from this pin.

# After setting the pin as output we need to setup the pin as PWM output pin,
# p = IO.PWM(output channel , frequency of PWM signal)
p = IO.PWM (13 ,500)

# p.start(dc) wheere dc = duty cycle


# To DO: Find image image and send them to azure cloud storage

The code doesn't show any errors but I am not sure how do I get the images. I don't know what this code is expected to do by the end - sorry using this camera for the first time. The goal is to capture images and send them on a different cloud server (in the same code). I can do the later part but I want to access images but I don't see them.

  • The actual camera should not make a difference. Have you checked the other answers in the duplicate question?
    – joan
    Jun 22, 2022 at 19:45
  • Yes, I did but that question doesn't ask about accessing cameras images.
    – Sulphur
    Jun 22, 2022 at 19:50

1 Answer 1


Nevermind. I just realized there is a documentation for it and it doesn't come up nicely in google search. Posting it here if anyone would find it useful.

Link: https://mapir-camera.gitbook.io/mapir-scripts/survey3-cameras/pwm-control-from-raspi

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.