I was working on project read the heart rate sensor and call the emergency when There is a problem and I cinnected it with Hc-05 and I found a cite that have most of the information to make the the app but unfortunately when i tried to test the app just black screen appered to me and I failed to connect it with the bluetooth module
Heart Rate Monitor with Arduino/Genuino 101 the link of the cite
![IMG-20231209-WA0150](https://community.appinventor.mit.edu/uploads/default/original/3X/f/9/f9067641104e6d0b332d7cb26a22c6358d425d1b.jpeg)