Magn Sens: README updated

diff --git a/sensors/MagneticFieldSensor/readme b/sensors/MagneticFieldSensor/readme
index 195e3605825dc6a25b71e787e89aa86f15a57bed..07dea39088ab0a83c080de6187c971c4bd720871 100644 (file)
--- a/sensors/MagneticFieldSensor/readme
+++ b/sensors/MagneticFieldSensor/readme
@@ -1,3 +1,15 @@
-This project is made for a ATmega168Pa with 16MHz/5V.
+This project is made for an Atmel ATmega328p microcontroller.
 
-It is tested on a Pro Mini Developement board.
+The microcontroller runs off an external 16MHz oscillator.
+The board can be powered with 3V3 or 5V.
+3V3 operation is only stable with 8MHz. Thus, a prescaler of 2 for the main clock is applied in the early startup of the uC.
+
+Each board will get a serial number that is being compiled into the firmware.
+It needs to be specified at compile time:
+
+    make SNUM=1
+
+Set the fuses and flash the firmware with:
+
+    make fuses
+    make program_avrisp2 # or program_dragon depending on your programmer