Cropfield Protection and Alert

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/2924848/widgets/1060885"></iframe>

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/2924848/widgets/1060886"></iframe>

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/2924848/widgets/1060887"></iframe>