Real time Android app based respiration rate monitor

Sensing Systems for Respiration Monitoring: A Technical Systematic Review

“…For the environmental category, modulation of cardiac activity was also very common [ 5 , 7 , 50 , 52 , 54 , 163 , 164 , 168 , 174 , 175 , 177 , 178 , 189 , 190 , 196 , 197 , 198 , 199 , 205 , 206 , 207 , 213 , 214 , 219 , 221 , 223 , 224 , 225 , 226 , 229 , 232 , 233 ]. Meanwhile, air temperature and air humidity were the second [ 2 , 64 , 91 , 104 , 107 , 116 , 120 , 128 , 133 , 145 , 153 , 154 , 155 , 156 , 162 ] and third [ 66 , 74 , 75 , 80 , 82 ,…”

“…This contrasts with the environmental category since radars are used in more than 33% of the studies, being the leading technology followed by cameras (18%) and fiber optic sensors (14%). There are types of sensors, such as magnetometers, gyroscopes, microphones, optical sensors, inductive sensors, or thermistors, in which its use is very limited in both categories [ 62 , 73 , 76 , 77 , 81 , 91 , 95 , 106 , 107 , 115 , 119 , 120 , 131 , 135 , 156 , 160 , 162 , 185 , 193 , 217 ].…”

“…Nose or mouth were also widely used locations to place the sensors. As a particular case of sensors placed in the nose or mouth, several researchers integrated them into a mask [ 66 , 75 , 80 , 82 , 92 , 101 , 107 , 137 , 156 ]. This contrasts with locations, like fingers, waist, arms, or wrists, in which use was residual [ 93 , 115 , 117 , 118 , 126 , 139 , 157 ].…”

“…However, in view of Table 4 , this method seems suitable for many applications. Wi-Fi, radio frequency, or Zigbee were used in a limited number of studies [ 73 , 96 , 144 , 156 , 159 ]. Regarding wired transmission, third column of Table 4 shows that USB communication was the preferred option [ 74 , 76 , 86 , 87 , 88 , 109 , 114 , 118 , 133 , 141 , 158 ].…”

“…Figure 22 shows the percentage distribution of the processing stations used in the studies selected in the systematic searches. PCs were the preferred processing stations, showing that most authors performed centralized processing, while the use of smartphones, tablets or cloud computing was not so common [ 2 , 59 , 65 , 66 , 67 , 74 , 76 , 77 , 84 , 91 , 98 , 99 , 101 , 102 , 107 , 109 , 116 , 119 , 122 , 130 , 132 , 134 , 143 , 144 , 156 ], although they were found in 30% of studies.…”