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Adjustments to the alarm clock circuit

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This commit is contained in:
Rhys Weatherley
2012-05-18 15:57:42 +10:00
parent a265ef1755
commit 942a7eae06
8 changed files with 38 additions and 94 deletions
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2
doc/Doxyfile
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@@ -668,7 +668,7 @@ EXCLUDE_SYMBOLS =
# directories that contain example code fragments that are included (see
# the \include command).
EXAMPLE_PATH = ../libraries
EXAMPLE_PATH = ../libraries ../AlarmClock
# If the value of the EXAMPLE_PATH tag contains directories, you can use the
# EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp

9
doc/alarm-clock.dox
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@@ -100,7 +100,8 @@ Some of the components can be purchased ready-made as the
16x2 LCD Shield</a> and the <a href="http://www.sparkfun.com/products/99">SparkFun
Realtime Clock Module</a>. I used the ready-made realtime clock module,
but made my own equivalent to the LCD shield from parts to aid in spacing
out the LCD and pushbuttons on the exterior of the box.
out the LCD and pushbuttons on the exterior of the box. The value of the 33R
resistor may need to be adjusted for different types of back light LED's.
The clock module is based on the DS1307 chip and has an on-board coin battery
to keep the time and date ticking over even if the main circuit loses power.
@@ -115,10 +116,4 @@ from batteries or mains power. The only difference will be the "Sense
Battery Status" input on A1. Either remove the battery monitoring logic
from the source code or tie A1 to 5V via a 10K resistor.
I had a spare 2N7000 FET from the KitTen kit that I wasn't using on the
Arduino board, so I used that for the back light control. If you don't
have a FET, then you can use a regular NPN transistor instead:
\image html transistor_back_light.png
*/