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Reduce LED brightness using PWM on 74HC OE

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This commit is contained in:
Pascal Engélibert 2022-09-03 09:17:19 +02:00
parent fe99a96406
commit 25a0680a90
Signed by: tuxmain
GPG key ID: 3504BC6D362F7DCA
2 changed files with 689 additions and 34 deletions
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6
README.md
View file

@ -10,13 +10,17 @@ Arduino alarm clock with binary matrix LED display and IR remote control.
* IR remote control for settings and stopping alarm * IR remote control for settings and stopping alarm
* big pushbutton for stopping alarm * big pushbutton for stopping alarm
* light sensor for dimming display * light sensor for dimming display
* better calibrate LED brightness
## Notes
A NE555 is used for generating a high-frequency PWM signal, feeding one 74HC's "Output Enable" port. This is because otherwise the LEDs are too bright, and playing with the serial signal to reduce brightness is not fast enough (it produces a perceptible blinking). Also, using the Arduino's internal PWM causes the serial transmission to behave erratically. And of course, as 74HC uses logical gates, it needs a binary (PWM) signal, not analog.
## TODO ## TODO
* supercapacitor & low-voltage detection * supercapacitor & low-voltage detection
* casing * casing
* multiple alarms * multiple alarms
* better LED dimming (maybe use PWM on 74HC's OE)
* date (at least weekday) * date (at least weekday)
* connection with online timetable? * connection with online timetable?
* progressive alarm ringing * progressive alarm ringing

717
alarmclock/alarmclock.kicad_sch
View file

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(uuid c21152ff-a65a-45e3-bc5c-281b6de2561f)
(property "Reference" "R5" (id 0) (at 74.93 149.86 90))
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(uuid c473d886-4ff1-480b-b845-981b3467af5b) (uuid c473d886-4ff1-480b-b845-981b3467af5b)
(property "Reference" "SW1" (id 0) (at 129.54 81.28 0)) (property "Reference" "SW1" (id 0) (at 129.54 83.82 0))
(property "Value" "SW_Push" (id 1) (at 129.54 83.82 0)) (property "Value" "SW_Push" (id 1) (at 129.54 83.82 0)
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(effects (font (size 1.27 1.27)) hide) (effects (font (size 1.27 1.27)) hide)
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@ -1318,6 +1872,37 @@
(pin "2" (uuid 2b791a90-19e5-4b05-aceb-2ccefb430ec2)) (pin "2" (uuid 2b791a90-19e5-4b05-aceb-2ccefb430ec2))
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(property "Reference" "C1" (id 0) (at 74.93 185.42 90))
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(property "Reference" "#PWR?" (id 0) (at 68.58 189.23 0)
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(property "Value" "GND" (id 1) (at 68.58 186.69 0))
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(effects (font (size 1.27 1.27)) hide)
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(pin "1" (uuid cd6e6de7-1230-4a7d-8b8e-82b3ff51f9a4))
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(symbol (lib_id "power:+5V") (at 81.28 57.15 0) (unit 1) (symbol (lib_id "power:+5V") (at 81.28 57.15 0) (unit 1)
(in_bom yes) (on_board yes) (fields_autoplaced) (in_bom yes) (on_board yes) (fields_autoplaced)
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(pin "1" (uuid 67819a43-8a0e-4937-a682-9ee221f3bbc4)) (pin "1" (uuid 67819a43-8a0e-4937-a682-9ee221f3bbc4))
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(property "Value" "DIODE" (id 1) (at 86.36 184.15 0)
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(symbol (lib_id "power:GND") (at 93.98 90.17 0) (unit 1) (symbol (lib_id "power:GND") (at 93.98 90.17 0) (unit 1)
(in_bom yes) (on_board yes) (in_bom yes) (on_board yes)
(uuid ef9c7fec-91ca-4276-9dc3-f182922c8ff6) (uuid ef9c7fec-91ca-4276-9dc3-f182922c8ff6)
@ -1434,11 +2036,30 @@
(pin "1" (uuid c0a75a50-5d6f-4f04-b9a6-c75a58c98c99)) (pin "1" (uuid c0a75a50-5d6f-4f04-b9a6-c75a58c98c99))
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(uuid ffeb9ebe-4380-4071-9467-9d7fac660fc5)
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(path "/10b43c5e-ec4b-4d13-a53d-a901fb067720"
(reference "#PWR?") (unit 1) (value "GND") (footprint "")
)
(path "/141a79ea-d231-4dbf-9c06-a05c2ffa3c1d" (path "/141a79ea-d231-4dbf-9c06-a05c2ffa3c1d"
(reference "#PWR?") (unit 1) (value "+5V") (footprint "") (reference "#PWR?") (unit 1) (value "+5V") (footprint "")
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@ -1463,6 +2084,12 @@
(path "/b7ec45b7-309e-49b5-84d7-3c2491b225fa" (path "/b7ec45b7-309e-49b5-84d7-3c2491b225fa"
(reference "#PWR?") (unit 1) (value "GND") (footprint "") (reference "#PWR?") (unit 1) (value "GND") (footprint "")
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(path "/b9e3f3d3-46a6-498b-b4a0-60539247e84f"
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@ -1481,6 +2108,18 @@
(path "/20e06040-d647-4f00-8cdf-985064ab739e" (path "/20e06040-d647-4f00-8cdf-985064ab739e"
(reference "BZ1") (unit 1) (value "Buzzer") (footprint "") (reference "BZ1") (unit 1) (value "Buzzer") (footprint "")
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@ -1490,8 +2129,17 @@
(path "/1eb8f36d-7d0c-4e5e-9fe2-5070db5fd7e3" (path "/1eb8f36d-7d0c-4e5e-9fe2-5070db5fd7e3"
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(path "/9954329c-d0c0-4703-9a96-4426d37f78df" (path "/44629472-077b-4fd8-ab99-7bd1e7b23c99"
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(path "/c21152ff-a65a-45e3-bc5c-281b6de2561f"
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(path "/5e0efdf5-5391-47b9-8121-86814fb3fe9e"
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@ -1505,5 +2153,8 @@
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) )