Update README.md

README.md

@@ -5,7 +5,7 @@ This is documentation for an energy monitoring device built around the nRF52832
 <img src='img/bc832-watt-1.jpg' width=40%>
 <img src='img/bc832-watt-3.jpg' width=44%>
 
-This device produces around 0.1 volts/amp out of the sensor (or ~1 mV per Watt through the plug).  The nrf adc has a +-0.6V reference, 4x gain, and 12-bit conversion, which might resolve 100mW (maybe finer with oversampling).  Certainly not precision measurement, but good enough for monitoring appliances.
+This device uses the <a href='http://www.ti.com/lit/ds/symlink/drv5053.pdf'>DRV5053VA</a> hall effect sensor to produce around 0.1 volts/amp out of the sensor (or ~1 mV per Watt through the plug).  The nrf adc has a +-0.6V reference, 4x gain, and 12-bit conversion, which might resolve 100mW (maybe finer with oversampling).  Certainly not precision measurement, but good enough for monitoring appliances.
 
  The nRF52 radio+microcontroller draws 5mA in transmit and receive, so it could operate well within the specs of a coin cell, or harvest from the power line (say, using http://www.linear.com/product/LTC3588-1) to charge a capacitor for power.