M5Stack version Meter Button Operation

Button function summary

Button A (left)

Short press

Selects Power scale screen if not already on it

• 1, 5, 10, 50, 100, 500, 1,000 Watts scales
• If scale screen is displayed, increments analog meter scale.
• Digital outputs have no scale.
• In Cal Screen, navigates d own and left
• In Cal edit mode, decrements value

5 sec press

Used as 1 of 2 button sequence to reset EEPROM to default.

Button B (middle)

Short press

Changes Bands

• There are 10 bands for better frequency calibrations
• Cycles through all bands (increment) wrapping back to the bottom band.

1 sec press

Configuration Mode

• Enter and exits Cal mode
• Selects a value to edit
• Commits a value being edited

Button C (right)

Short Press

Selects SWR analog meter display

• No effect on digital fields

5 sec press

Used as 2nd button of 2 button sequence to reset EEPROM to defaults -

• Pressing most any other button before power cycling the CPU will cancel EEPROM overwrite because status is rewritten marking the EEPROM good again.
• EEPROM reset cannot be performed while in the Cal screen

10 sec press

Toggles the power meter serial data output.

• Does not affect normal serial status messages or ability to accept remote commands
• 115200 baud if you want to hook up an ASCII terminal program to see the output. Can easily change in the code.