1. Objectives: Lead Switching Circuitry/Control Analog to Digital Converter Write to Computer

2. Lead Switching 8 leads to switch between for each op-amp input This means we need to use a 8:1 multiplexer for each op-amp input 6 control bits (3 for each mux) from arduino

3. Controlling Arduino GPIO Use function: pinMode(pin, mode) to set 6 Arduino pins to the output state Use function: digitalWrite(pin, value) to set the mux control pins

4. Analog to Digital Converter 6 Analog Inputs that can be read with: analogRead() Max sampling Rate of approximately 10 kHz Maps 0V – 5V from integer values 0 – 1023 Each lead should be recorded for 10 s (from textbook)

5. Writing to the Computer Use Serial.print() function in Arduino to send the digital values to the computer Using python and the Matplotlib library will allow us to create a program that reads in and plots these values (ecg code can be found online)

6. Overview Analog input: Connect to amplifier output Digital Output: Connect to mux control bits Serial Port: Used for writing data to computer Power: Powers amplifiers