redmilk525study.blogspot.com

redmilk's study blog

PIR on Raspberry Pi. 生活中有個應用是, 大廳、走廊、或是電梯裡. 2 Connecting to a PIR. PIR 通常有 3 根pin, 分別是 VDD, GND, 以及 Signal out. 我手上這顆 PIR 型號是 Panasonic PIR AMN44122:. 然後如下圖這樣接, 其中 PIR 的 OUT 接到 RPi 的某根 GPIO 上來讀取狀態, 這邊選的是板子編號 12 的 pin 腳. 另外 LED 接的 GPIO 是板子編號 16 的 pin 腳. 程式邏輯是, 如果從 PIR 讀到的值由 0 變 1, 就點亮 LED, 並啟動 count down. 當 PIR 變 0, 就等個 3 秒之後再把 LED 關掉. 中間如果 PIR 又變回 1 了, 那麼 count down 就重新算. 最後如果用Ctrl-C離開程式, 就把 GPIO 全關. 電量 (Power Capacity) 指的是電池裡儲存了多少能量, 單位通常是瓦特小時 (Watt-hour, Wh). Voltage * Amp * hour = Wh. 它以 12V 的核心組成, 常看...

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<META> DESCRIPTION

PIR on Raspberry Pi. 生活中有個應用是, 大廳、走廊、或是電梯裡. 2 Connecting to a PIR. PIR 通常有 3 根pin, 分別是 VDD, GND, 以及 Signal out. 我手上這顆 PIR 型號是 Panasonic PIR AMN44122:. 然後如下圖這樣接, 其中 PIR 的 OUT 接到 RPi 的某根 GPIO 上來讀取狀態, 這邊選的是板子編號 12 的 pin 腳. 另外 LED 接的 GPIO 是板子編號 16 的 pin 腳. 程式邏輯是, 如果從 PIR 讀到的值由 0 變 1, 就點亮 LED, 並啟動 count down. 當 PIR 變 0, 就等個 3 秒之後再把 LED 關掉. 中間如果 PIR 又變回 1 了, 那麼 count down 就重新算. 最後如果用Ctrl-C離開程式, 就把 GPIO 全關. 電量 (Power Capacity) 指的是電池裡儲存了多少能量, 單位通常是瓦特小時 (Watt-hour, Wh). Voltage * Amp * hour = Wh. 它以 12V 的核心組成, 常看...

<META> KEYWORDS

1 redmilk's study blog

2 1 introduction

3 燈是暗的感應到有人經過時燈就亮了

4 我們可以用 pir 做到同樣的應用

5 3 coding

6 沒有留言

7 battery

8 3 alkaline battery

9 4 ni cad battery

10 5 ni hm battery

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redmilk's study blog,1 introduction,燈是暗的感應到有人經過時燈就亮了,我們可以用 pir 做到同樣的應用,3 coding,沒有留言,battery,3 alkaline battery,4 ni cad battery,5 ni hm battery,cmake,只要安裝 cmake 套件就可以使用,2 簡易範例,假如有底下這些檔案,myproj/,mainc,primec,primeh,cmakelists txt,後面的點代表當前目錄,3 簡易專案,build/

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redmilk's study blog | redmilk525study.blogspot.com Reviews

https://redmilk525study.blogspot.com

PIR on Raspberry Pi. 生活中有個應用是, 大廳、走廊、或是電梯裡. 2 Connecting to a PIR. PIR 通常有 3 根pin, 分別是 VDD, GND, 以及 Signal out. 我手上這顆 PIR 型號是 Panasonic PIR AMN44122:. 然後如下圖這樣接, 其中 PIR 的 OUT 接到 RPi 的某根 GPIO 上來讀取狀態, 這邊選的是板子編號 12 的 pin 腳. 另外 LED 接的 GPIO 是板子編號 16 的 pin 腳. 程式邏輯是, 如果從 PIR 讀到的值由 0 變 1, 就點亮 LED, 並啟動 count down. 當 PIR 變 0, 就等個 3 秒之後再把 LED 關掉. 中間如果 PIR 又變回 1 了, 那麼 count down 就重新算. 最後如果用Ctrl-C離開程式, 就把 GPIO 全關. 電量 (Power Capacity) 指的是電池裡儲存了多少能量, 單位通常是瓦特小時 (Watt-hour, Wh). Voltage * Amp * hour = Wh. 它以 12V 的核心組成, 常看...

INTERNAL PAGES

redmilk525study.blogspot.com

1

redmilk's study blog: 十一月 2014

http://redmilk525study.blogspot.com/2014_11_01_archive.html

1 Use objdump dump ELF binary. 如果想 dump 每個 section 的 binary, 可以用objdump. D 4002b8 72000000 75000000 7e000000 281d8c1c r.u. .(. 4002c8 4245d5ec bbe3927c bc50769e 86f0967c BE. .Pv. 4002d8 96a08997 3cad390d d871581c ce2c6372 . .9.qX.,cr 4002e8 e46241f5 b88df10e 39f28b1c 32c4f712 .bA.9.2. 4002f8 ead3ef0e b3a2f712 . 可以用 objdump 找 section. 也可以指定範圍, 比如說 .interp 從 0x400238 到 0x400253. 如果指定的範圍超過 section 邊界的話, 它會將跨過的 section 名字也印出來. 如果只想把 ELF 檔案當 binary 來印, 或是想印某些純 binary 檔. 2 Use objdump to disassemble file.

2

redmilk's study blog: FreeRTOS Low Power Support

http://redmilk525study.blogspot.com/2015/01/freertos-low-power-support.html

FreeRTOS Low Power Support. 在 FreeRTOS 裡, Power Saving 相關的工作通常會放在 idle task 裡面作, 它的作法是限制periodic tick interrupt, 這樣可以減少 period task的耗電. 實際作法是, 它停止 periodic tick interrupt, 然後在 restart periodic tick interrupt實調整 RTOS tick count. 在 tick interrupt 停止的時候, microcontroller 就可以進 deep power saving state, 直到有interrupt發生. Idle task 放在 task.c. Static portTASK FUNCTION( prvIdleTask, pvParameters ). 裡面有 infinite for loop 不停地執行一些工作, 包括:. 呼叫 idle hook funtion. 其中有兩個 hook function 會因為 power saving 的機制受到影響. PortSUPPRESS ...

3

redmilk's study blog: 十月 2014

http://redmilk525study.blogspot.com/2014_10_01_archive.html

Static library and shared library. Static library 把許多 object 檔包成同一個檔案, 用 ar 指令打包. 在 link 的時候, 會在 library 裡找到對應的 object 副本, 再作 link 的動作. 它以 object 檔為單位, link 的時候會放一份副本. 也因此如果有多個執行檔都用到同個 static library, 每個執行檔都會有一份副本. 在更新 static library 時, 也得要將所有用到這份 static library 的執行檔都重新 link. Shared library 透過 mmap 的機制讓多個 process 共享記憶體, 並參考其中內容. 一樣是將多個 object 打包, OS 會參考 memory mapping table , 等到實際取用的時候才去讀取資料. 更新 shared library 也只需要更新一次. Shared 表示要建立 shared object. Soname 表示 shared object soname, (別名). 如果 /etc/ld.so&#...

4

redmilk's study blog: 四月 2015

http://redmilk525study.blogspot.com/2015_04_01_archive.html

寫 project euler 的時候, 有些問題想不到速度快的解法, 只好用平行運算來加速. 平常程式都以一條 thread 在執行, 要開多條 thread 來跑, 在管理上就很麻煩. OpenMP 讓人可以平行處理, 又可以減少管理的麻煩. 2 對 for 做 parallel. Include stdio.h #include omp.h int main() { #pragma omp parallel for for (int i=0; i 6; i ) { printf("%d ", i); } printf(" r n"); return 0; }. C99 -o openmp example 01 openmp example 01.c -fopenmp. 在 header 檔要加入 omp.h. 在 for 迴圈前加上 #pragma omp, 這個是用來使用omp的功能, 後面是控制敘述. Pragma omp directive [clause[ ,] clause] .]. 前個例子裡, 其實 parallel 和 for 都是 directive 的敘述, 所以它可以拆成兩個.

5

redmilk's study blog: OpenMP in linux

http://redmilk525study.blogspot.com/2015/04/openmp-in-linux.html

寫 project euler 的時候, 有些問題想不到速度快的解法, 只好用平行運算來加速. 平常程式都以一條 thread 在執行, 要開多條 thread 來跑, 在管理上就很麻煩. OpenMP 讓人可以平行處理, 又可以減少管理的麻煩. 2 對 for 做 parallel. Include stdio.h #include omp.h int main() { #pragma omp parallel for for (int i=0; i 6; i ) { printf("%d ", i); } printf(" r n"); return 0; }. C99 -o openmp example 01 openmp example 01.c -fopenmp. 在 header 檔要加入 omp.h. 在 for 迴圈前加上 #pragma omp, 這個是用來使用omp的功能, 後面是控制敘述. Pragma omp directive [clause[ ,] clause] .]. 前個例子裡, 其實 parallel 和 for 都是 directive 的敘述, 所以它可以拆成兩個.

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redmilk525study.blogspot.com

redmilk's study blog

PIR on Raspberry Pi. 生活中有個應用是, 大廳、走廊、或是電梯裡. 2 Connecting to a PIR. PIR 通常有 3 根pin, 分別是 VDD, GND, 以及 Signal out. 我手上這顆 PIR 型號是 Panasonic PIR AMN44122:. 然後如下圖這樣接, 其中 PIR 的 OUT 接到 RPi 的某根 GPIO 上來讀取狀態, 這邊選的是板子編號 12 的 pin 腳. 另外 LED 接的 GPIO 是板子編號 16 的 pin 腳. 程式邏輯是, 如果從 PIR 讀到的值由 0 變 1, 就點亮 LED, 並啟動 count down. 當 PIR 變 0, 就等個 3 秒之後再把 LED 關掉. 中間如果 PIR 又變回 1 了, 那麼 count down 就重新算. 最後如果用Ctrl-C離開程式, 就把 GPIO 全關. 電量 (Power Capacity) 指的是電池裡儲存了多少能量, 單位通常是瓦特小時 (Watt-hour, Wh). Voltage * Amp * hour = Wh. 它以 12V 的核心組成, 常看...

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