S2 Week 6

For this week, I would like to update on the components since last time, the budget was too high. I contacted a senior student and managed to replace some parts that was very high in price. I decided to replace the Myoware muscle sensor with an AD8232 Heart Rate monitor.

AD8232 Heart rate monitor

This sensor is actually usable for finding EMG signals. This is confirmed by my contact. I choose this sensor because my contact is willing to sell to me cheaper with the jack for electrodes. It costed me RM 100 only. 

A little bit of info on the sensor: 

Features and Benefits

• Fully integrated single-lead ECG front end
• Low supply current: 170 μA (typical)
• Common-mode rejection ratio: 80 dB (dc to 60 Hz)
• Two or three electrode configurations
• High signal gain (G = 100) with dc blocking capabilities
• 2-pole adjustable high-pass filter
• Accepts up to ±300 mV of half cell potential
• Fast restore feature improves filter settling
• Uncommitted op amp
• 3-pole adjustable low-pass filter with adjustable gain
• Leads off detection: ac or dc options
• Integrated right leg drive (RLD) amplifier
• Single-supply operation: 2.0 V to 3.5 V
• Integrated reference buffer generates virtual ground
• Rail-to-rail output
• Internal RFI filter
• 8 kV HBM ESD rating
• Shutdown pin
• 20-lead 4 mm × 4 mm LFCSP package