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# Demo Mode # Demo Mode
For Demo and Testing Purpose, the device can use pre-recorded images. For Demo and Testing Purpose, the device can use pre-recorded raw images.
You need to enable it in the configuration (`TakeImage > Demo`) and also provide the needed files on the SD card. You need to enable it in the configuration (`TakeImage > Demo`) and also provide the needed files on the SD card.
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## Recording ## Collecting images of your device
To record real images of a meter, you have to periodically fetch `http://<IP>/img_tmp/raw.jpg`. There are several ways to collect images from your device:
1. Use the `RawImagesLocation` parameter to store them directly onto your SD card, see [Parameter `RawImagesLocation`](Parameters/#parameter-rawimageslocation)
1. Use the Webhook to send the raw image on each round to a dedicated server, see [Webhook](Webhook) resp. [Parameter `UploadImg`](Parameters/#parameter-uploadimg).
1. Another option is to pull the images periodically from `http://<IP>/img_tmp/raw.jpg`. Eg. with an external service. Below is a (Linux)-Bash script to do it:
To automate this, you can use the following shell script (Linux only):
```bash ```bash
#!/bin/bash #!/bin/bash
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``` ```
## Use prepared images
## Installation See the selection below with prepared images.
Just install the zip file using the OTA Update functionality.
## How does it work ## How does it work
The Demo Mode tries to interfere as less as possible with the normal behavior. Whenever a Cam framebuffer gets taken (`esp_camera_fb_get()`), it replaces the framebuffer with the image from the SD card. The Demo Mode tries to interfere as less as possible with the normal behavior. Whenever a Cam framebuffer gets taken (`esp_camera_fb_get()`), it replaces the framebuffer with the image from the SD card.
## Example Data of a Water Meter ## Example Data of a Water Meter
You can use the following demo images if you want: You can use the following demo images if you want: