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--- projects:blinker:work_logs:7_code [2022/02/28 12:55] – tjhowse
+++ projects:blinker:work_logs:7_code [2022/03/03 07:17] (current) – tjhowse
@@ Line 63: / Line 63: @@
 // Shut down ADC and timer0
 PRR = 0b11;
-</code
+</code>
-The biggest power saving is putting the microcontroller to sleep between "frames" of the sequence.
+The biggest power saving came from putting the microcontroller to sleep between "frames" of the sequence.
 <code c>
@@ Line 89: / Line 89: @@
 This approach reduced power consumption by the CPU and LED [[projects:blinker:work_logs:6_power_consumption_testing|by around 95%. ]]
-===== Video =====
+==== Testing ====
-{{ youtube>WTbTDbBAby0?large }}
+I don't (yet) know how to read Morse code, but I wanted to validate whether I was blinking out the message correctly, and looping around at the end. I wrote some [[https://github.com/tjhowse/blinker/blob/main/code/webcam.py|shockingly dodgy]] OpenCV code to watch the LED through a webcam and decode the Morse:
-===== Next Time =====
+{{:projects:blinker:work_logs:pasted:20220228-130034.png}}
+It worked really well! I fed some [[https://en.wikipedia.org/wiki/Lorem_ipsum|Lorem ipsum]] into the sequence generator and slowed the blink interval down to 500ms. I ran it for a few hours and it validated that everything was working as it should. During this testing I measured the longest message I could fit onto the microcontroller alongside the code to display it:
+<code>
+lorem ipsum dolor sit amet  consectetur adipiscing elit  donec faucibus  orci
+quis iaculis volutpat  lacus mi sollicitudin sem  at dignissim turpis arcu nec
+est  fusce elementum vitae risus non aliquam  proin finibus arcu ullamcorper
+scelerisque orci egestas  varius mi  nulla bibendum eros sit amet leo
+pellentesque lobortis  curabitur a gravida mauris  ac tincidunt ex  phasellus
+sagittis congue massa  quis tincidunt felis  nunc et orci eget mi mollis viverra
+non in nunc  nullam dapibus pulvinar lectus  ut facilisis neque  vestibulum at
+tellus id enim posuere sagittis  nam tincidunt vel nulla eu tempor  abcdef
+qwerty asdfg zxcvb
+</code>
+Switching from a Logitech C922 Pro to a PS3 eye let me reduce the dit interval to the final value of 125ms and still decode it perfectly. Fun!
+===== Video =====
-I don't think there's much point in trying to further improve energy efficiency of the code. The next steps might be adding features like multiple message sequences, and/or improving the space efficiency to fit more/longer messages.
+{{ youtube>PKivx9OP3eo?large }}
 [<6>]