Update README.md

README.md

@@ -85,13 +85,18 @@ y = 0.6022 * x - 0.6022 * x1 + 0.6022 * x2 + 0.6022 * y1 - 0.2043 * y2;
 X is the output from the low pass filter.
 Y is the output from the notch filter.
 
-
 **Heart Rate Monitor:**
 
 The time interval between two high amplitude R waves (R-R Interval) is used to calculate the instantaneous heart rate. Thresholding was done in Arduino to detect the R peaks and thereby calculate heart rate.
 
 A 16x2 LCD display is connected to Arduino to display beats per minute(BPM).
 
+**Our Circuit**
+
+<p align="center">
+ <img src="images/circuit.jpg" width="500" />
+</p>
+
 ### Results
 
 Single lead ECG detection using three electrodes was performed and the resulting ECG signal after passing through the cascade of the above filters was visualized using Arduino Serial plotter. Signal was sampled at a frequency of 500Hz. The entire circuit is assembled on a breadboard and powered through two 9v batteries making the prototype portable. Any abnormal heartbeat is indicated to the subject. The placement of electrodes also plays a role in the generation of different waves. We placed the positive electrode on the left hip, a negative electrode on the right shoulder and a electrode from the left hand wrist is given as a ground reference. This placement of electrodes is along the axis of heart alignment. Our observed ECG is