Door lock with MOSFETs and and without RFM.HEADmaster

1 files changed, 48 insertions, 0 deletions

diff --git a/door_lock/README.txt b/door_lock/README.txt
new file mode 100644
index 0000000..08f320f
--- /dev/null
+++ b/door_lock/README.txt
@@ -0,0 +1,48 @@
+CURRENT MEASUREMENTS
+
+PERIPHERALS:
+
+R503 FPM:
+
+When VCC is connected to a 3.31V supply, FPM draws 13.8mA of quiescent current. When
+VCC is disconnected (3.3VT connected to 3.31V supply), it draws 2.9uA. 
+
+FS5106B high-torque servo:
+
+One of them draws 6.1mA when connected and stabilizes at 4.6mA. The other drew
+variable amounts initially (4.7mA, 5mA+, but mostly 4.7). Both draw 4.6mA of
+quiescent current with a 5.07V supply.
+
+TARGET CURRENT DRAW
+
+ 1. 2.7mA for 1 month
+ 2. 1.4mA for 2 months
+ 3. 900uA for 3 months
+ 3. 694uA for 4 months
+
+LINEAR REGULATORS
+
+ 1. When the ATmega328P is in normal mode, the MCU + FPM + Servo + linear
+    regulators draw 30.6mA of quiescent current at 5.07V.
+ 2. When the ATmega328P is in power down mode, the MCU + FPM + Servo + linear
+    regulators draw 26.2mA of quiescent current at 5.07V.
+ 3. When the ATmega328P is in power down mode, the MCU + linear regulators draw
+    13.7mA of quiescent current at 5.07V (without MOSFETS).
+
+MP1584EN BUCK CONVERTER
+
+ 1. When the system is in power down mode, the MCU + FPM + Servo draw 8.9mA at
+    3.3V. The real amount is likely about 8.9 + 4.6 = 13.5mA.
+ 2. When FETs are used quiescent current drops to 0uA.
+ 3. Active current draw (when the servo rotates) measured are 152.8mA, 162.8mA,
+    170.3mA
+
+REMARKS
+
+ 1. Can't use 3.3V FPM modules with Arduino Uno. The RX and TX lines have
+    resistors. 
+ 2. When measuring current with the buck chips on, the servo doesn't respond.
+    So, the value measured probably doesn't include the current the servo 
+    draws.
+ 3. N-channel high-side switching doesn't work without a 9V supply. 7.2V+ with 
+    batteries don't work either.