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# 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.
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## Recording
To record real images of a meter, you have to periodically fetch `http://<IP>/img_tmp/raw.jpg`.
## Collecting images of your device
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
#!/bin/bash
while [[ true ]]; do
echo "fetching value..."
wget -q http://192.168.1.151/value -O value.txt
value=`cat value.txt`
echo "Value: $value"
diff=`diff value.txt value_previous.txt`
changed=$?
#echo "Diff: $diff"
if [[ $changed -ne 0 ]]; then
echo "Value changed:"
echo $diff
echo "fetching image..."
wget -q http://192.168.1.151/img_tmp/raw.jpg -O $value.jpg
else
echo "Value did not change, skipping image fetching!"
fi
cp value.txt value_previous.txt
echo "waiting 60s..."
sleep 60
done
```
## Installation
Just install the zip file using the OTA Update functionality.
```bash
#!/bin/bash
while [[ true ]]; do
echo "fetching value..."
wget -q http://192.168.1.151/value -O value.txt
value=`cat value.txt`
echo "Value: $value"
diff=`diff value.txt value_previous.txt`
changed=$?
#echo "Diff: $diff"
if [[ $changed -ne 0 ]]; then
echo "Value changed:"
echo $diff
echo "fetching image..."
wget -q http://192.168.1.151/img_tmp/raw.jpg -O $value.jpg
else
echo "Value did not change, skipping image fetching!"
fi
cp value.txt value_previous.txt
echo "waiting 60s..."
sleep 60
done
```
## Use prepared images
See the selection below with prepared images.
## 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.
## Example Data of a Water Meter
You can use the following demo images if you want: