Resetting Waspmote Plug & Sense! With An External Magnet - Libelium waspmote plug & sense Technical Manual

Resetting Waspmote plug & sense! with an external magnet
11. Resetting Waspmote plug & sense! with an external magnet
Since June 2013, Waspmote Plug & Sense! has a new feature: it can be reset with an external magnet, with no contact. If one
node stops working or if a defective behavior is detected, it would be costly to uninstall the node to bring it back to laboratory.
This new feature allows the network manager to reset the node in a quick and easy way.
The hardware consists of a reed switch connected to the Waspmote reset line. When the user gets the magnet close to the reed-
switch, the reset is activated. When the user moves the magnet away, the reset line is released (the external led will blink) and
Waspmote executes the bootloader first and then, the setup function. After the setup, it will continue with the loop function.
Next pictures shows the right way to reset the node using an external magnet, first moving it closer, and then moving it away.
Figure : Moving the magnet closer to the node.
Figure : Moving the magnet away from the node.
The magnet is made of neodymium. It is a special, high-power magnet. We only advise to use the magnet Libelium provides. The
user must be careful because the magnet is so powerful that it can get stuck to metal objects. Besides, the magnet must be kept
away from electronic devices like PCs, batteries, etc, since they could be damaged or information could be deleted.
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