Yesterday and today we conducted some EMI testing on the LipSync to see if modifications to the PCB or circuitry might be necessary.

@Charles Gallagher and I fit the prototype LipSync electronics into the 3-D printed housing. When printing the housing we decided to use conductive ABS in order to preemptively address any excess electromagnetic interference (EMI) which may be produced by the LipSync. This consideration was taken because it will be used in close proximity to wheelchairs, medical equipment and other electronic devices.

Our preliminary tests with an electric field probe seem to indicate that the conductive ABS housing which is connected to the ground of the PCB is suppressing EMI being produced from the LipSync electronics - SUCCESS!

Today (Wednesday) I attempted to measure any EMI from the LipSync electronics without the housing while the electronics are connected to my smartphone and continuously moving the cursor via Bluetooth. The electric field probe seems to be showing that minimal stray electric fields are present. The only modification which I may have done was set all the unused I/O pins to inputs which are being pulled-up internally through software.

With the Bluetooth transmitting data to my smartphone to move the cursor I presume that RF at ~2.4GHz is being produced yet the electric field probe is only showing a very minor (qualitative) increase in any EM radiation being emitted. Very peculiar, I will keep looking into this.