(target-wiring-weighing-scale)=
# Weighing Scale Wiring Schematic

In Aeon experiments, animals' weights are monitored regularly with weight measurements taken whenever they enter the [nest](target-nest), which has a weighing scale attached to it. 

## Connections

:::{image} ../../images/weighing-scale-connection.svg
:alt: Weighing scale wiring schematic
:class: img-hardware-main
:align: center
:::

1. The weighing scales are provided with power from a COM port connection from the PSU.

2. A connection to the behaviour machine is made by wiring a connection through a RS232 port. <!--TODO: check the pins-->