Read the statement by Michael Teeuw here.
how to start an image slide show with a press of a button?
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 Ah sorry… the MMM was missing. should be this: http://your.raspberry.ip.address:8080/remote?action=HIDE&module=module_0_MMM-ImageSlideshowAnd http://your.raspberry.ip.address:8080/remote?action=SHOW&module=module_0_MMM-ImageSlideshow
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 works perfectly, thank you so much for your help! and now to the ultimate question for me… Is it possible to start the camera on full screen by a press of a button? 
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 surely, but i don’t know what camera u mean^^ A security camera somewhere at your house or the RPi camera? For security u could check this: https://github.com/shbatm/MMM-RTSPStream for RPi cam u could check this: https://forum.magicmirror.builders/topic/603/camera-module 
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 I use a Microsoft round web cam that I’ve embedded into the frame and I’m using the camera module however the voice recognition is not very good so I wanted to start it with a press of a button, but I don’t know how and how to display the video vertically on full screen. 
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 So you use the camera module i posted? unfortunately i don’t use this module, so i am maybe the wrong person to ask… But i took a look at the webcam.js of the module and in line 46/47 the width and hight is defined. 
 Maybe u should play around with that…
 https://github.com/alexyak/camera/blob/master/webcam.jsnano MagicMirror/modules/camera/webcam.jsalso check the camera.js at line 62/63… nano MagicMirror/modules/camera/camera.jsI don’t know if it would be necessary to set the resolution of the cam within raspbian… ? To start the cam with a button u can even use the MMM-Buttons module. This should work, if i understand the camera-module correct ^^ { module: 'MMM-Buttons', config: { maxShortPressTime: 1000, buttons: [ { pin: 15, name: "camera", shortPress: { notification: "SHOW_CAMERA", } }, longPress: { notification: "HIDE_CAMERA", }, }, ] } },

