ECG Sensor Breakout boards Sparkfun AD8232 Single Lead Heart Rate Monitor, no ADC $22 Protocentral ECG & Respiratory MAX3001 $60 Protocentral ECG MAX30003 $42 Protocentral ECG 3 Channel ADS1293 $48 Protocentral ECG & Respiratory ADS1292R $48 Maxim / Analog Devices AFE MAX30001G MAX30001G Datasheet MAX30003 MAX3003 Datasheet Analog Devices AFE General AD8232, single channel, RL IEEE Paper with AD8232 Texas Instruments AFE General ADS1293 3 Channels with RL ADS1292R 2 ECG Channles, 1 Respiration, RL