Footswitch: Level 1
Module
Inputs
Outputs
Functionality
Module
Inputs
Outputs
USB Connector
Power: 5V DC power from USB connection
USB data: D+ and D- data lines from USB connection
MCP2200 data: D+ and D- data lines from MCP2200
Power: 5V DC power to LED indicators
Power: 5V DC power to MCP2200
Power: 5V DC power to ATmega8 Microcontroller
USB data: D+ and D- data lines to USB Connection
MCP2200 data: D+ and D- data lines to MCP2200
Functions as a physical connection between footswitch module and PC
MCP2200 – USB2UART Converter
Power: 5V DC power from USB connector
Data: D+ and D- data lines from USB connector
GPIOs data: encoded as binary data (up to 4 IOs) to indicate the buttons status from
microcontroller
UART data: data from microcontroller to RX pin of MCP2200
Data: D+ and D- data lines to USB Connector
Ready: completed initialization status to LED indicator
Status: completed initialization (using USBCFG pin) and PC Program status (sent through USB
commands) encoded as binary data output to microcontroller using 2 IO pins
Functionality
Module
Inputs
Outputs
Functionality
Module
Inputs
UART data: data to microcontroller from TX pin of MCP2200
A bridge between the microcontroller and the PC Program which handles USB commands
from PC program, sends GPIOs status to PC program, sends PC Program status to
microcontroller as well as transfers strings between PC program and microcontroller through
UART.
ATmega8 - Microcontroller
Power: 5V DC power from USB connector
MCP2200 status: MCP2200 completed initialization (using USBCFG pin) and PC Program
status encoded as binary data
UART data: data from MCP2200 to RX pin of ATmega8
Buttons status: pushed/released status of buttons encoded as high/low signals
GPIOs data: buttons status encoded as binary data and output through IO pins
UART data: data to MCP2200 from TX pin of ATmega8
Keeps track of the buttons status (3 buttons) and detects short, double presses (tactile
switches) and on/off status (on/off switches) based on time interval, then sends these
detected status to MCP2200. Also stores configured preset intervals by users via PC program.
Outputs
Functionality
LED indicators
Power: 5V DC power from USB connector
Ready: completed initialization status from MCP2200
None
2 LEDs indicate the power status and completed initialization status of MCP2200
Module
Inputs
Outputs
Functionality
Buttons
User interactive: physical interactive from user
Status: Pressed/Released status to ATmega8
3 buttons convert user interactive to signals (including 2 tactile switches and 1 on/off switch)