diff --git a/README.md b/README.md
index bdd4d44..84ba187 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,14 @@
the USB bug detector identifies USB type-A cables (or devices) with integrated circuits.
-
-
+
+
usage
=====
to use the USB bug detector, follow the steps provided on the back of the board:
-- insert a CR2025 or CR2032 coin cell battery in the USB bug detector for it to be operational
+- insert a CR1220 coin cell battery in the USB bug detector for it to be operational
- press on the RESET button to arm the test
- the BUGGED LED should be off
- plug the USB cable in the USB receptacle
@@ -17,32 +17,15 @@ to use the USB bug detector, follow the steps provided on the back of the board:
after the test, to save power, press again on the RESET button.
-to ensure that the USB bug detector works, after pressing on the RESET button, press on the TEST button.
+to ensure that the USB bug detector works, after pressing on the RESET button, press on the SIMULATE button.
this will simulate a USB plug with integrated circuit.
the BUGGED LED should switch on.
this also ensures the battery is not empty.
when the LED is on, the USB bug detector draws 3 mA.
when the LED is off, the USB bug detector draws 64 nA.
-this results in a idle battery life of 419 years (for a typical 235 mAh CR2032 battery).
-this is more than the self life of the battery (~ 1%/year).
-
-fabrication
-===========
-
-the board has an optional READY LED (with accompanying resistor located next to it).
-only populate it to debug the board.
-the READY LED will we on when the BUGGED LED isn't.
-this allows to always check if the battery is empty, but this also drains the battery even when not testing because an LED is always on.
-
-the first prototype of the board (v0) offers three populating options, depending on the available NOR gate part and package:
-
-- 1x SOIC-14 package: U1+C1
-- 2x SOT23-5 pachgae: U2+C2, U3+C3
-- 2x SOT-353 package: U3+C3, U5+C5
-
-only populate one of the options, depending on the availability of the NOR gate part.
-note: the Cx decoupling capacitor is not really necessary and is just present for good design.
+this results in a idle battery life of 62 years (for a typical 35 mAh CR1220 battery).
+this is on par with the self life of the battery (~ 1%/year).
mode of operation
=================
@@ -61,8 +44,8 @@ this minimum 1.6 mA current draw is often caused by the decoupling/bypass capaci
when charging, the capacitor acts as a short for a small time, allowing current to flow.
on USB plugs with just resistors, or LEDs, the resulting current flow is not large enough.
-the TEST circuit simulates an integrated circuit by putting a 100 nF capacitor across the USB receptacle.
+the SIMULATE circuit simulates an integrated circuit by putting a 100 nF capacitor across the USB receptacle.
-because of the 1 k Ohm inline resistor, and limited 3.3 V provided by the battery, a maximum of 3.3 mA can be drawn by the USB plug.
+because of the 1 kOhm inline resistor, and limited 3.3 V provided by the battery, a maximum of 3.3 mA can be drawn by the USB plug.
this is often not enough to power up integrated circuit properly, particularly if they use a radio interface.
thus it is safe to use the USB bug detector on bugs, without activating it.