During the bring-up of the machine, it occurred to me, that charging or supplying the tablets via the USB OTG micro-A jack should be monitored more closely.
Many current and voltage monitoring devices are around. An inexpensive type will do. The device selected alternates cyclically between displaying current and voltage.
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The clamshell case can be opened easily, e.g., by using a Xacto knife.
Due to their contact resistance, pluggable connectors are to be avoided. So they have been desoldered. All power connections have been made of wire with a sufficient cross-section.
![](project_images/smallpc_images/strom3a.gif)
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