{"id":4272,"date":"2023-11-16T15:10:38","date_gmt":"2023-11-16T07:10:38","guid":{"rendered":"http:\/\/www.wangkaixuan.tech\/?p=4272"},"modified":"2023-11-17T09:07:27","modified_gmt":"2023-11-17T01:07:27","slug":"%e5%85%a5%e5%9d%91%e6%a0%91%e8%8e%93%e6%b4%be-02-led%e7%81%af%e5%b0%8f%e5%ae%9e%e9%aa%8c","status":"publish","type":"post","link":"http:\/\/www.wangkaixuan.tech\/?p=4272","title":{"rendered":"\u5165\u5751\u6811\u8393\u6d3e-02-LED\u706f\u63a7\u5236"},"content":{"rendered":"\n

1.\u5355\u8272LED\u706f<\/h1>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u70b9\u4eae\u5355\u8272LED\u706f\u65e0\u9700\u5b89\u88c5\u4efb\u4f55\u5e93\uff0c\u76f4\u63a5shell\u547d\u4ee4\u884c\u5c31\u884c\u3002<\/p>\n\n\n\n

\u8fd9\u51e0\u4e2aLED\u706f\u90fd\u8fde\u63a5\u5728\u6811\u8393\u6d3e\u7684GPIO\uff08General-Purpose Input\/Output\uff09\u7aef\u53e3\u4e0a\uff1a<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u7aef\u53e3\u660e\u7ec6\u5982\u4e0b\uff1a<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u901a\u8fc7\u7ffb\u9605\u6269\u5c55\u7248\u7684\u8d44\u6599\uff0c\u6211\u4eec\u4e86\u89e3\u5230\u8fd9\u51e0\u4e2a\u706f\u8fde\u63a5\u5728\u8fd9\u51e0\u4e2a\u7aef\u53e3\u4e0a\uff08\u5373\u4e0a\u56fe\u4e2dNAME\u4e2d\u7684GPIO17\uff0c\u4e0d\u662f\u4e0a\u56fe\u4e2d\u7684Pin17\uff09\uff1a<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u80fd\u901a\u8fc7\u63a7\u5236\u8fd9\u51e0\u4e2aGPIO\u7aef\u53e3\u7684\u7535\u5e73\u9ad8\u4f4e\u6765\u5b9e\u73b0\u63a7\u5236LED\u7684\u4eae\u548c\u706d\u4e86\u3002<\/p>\n\n\n\n

\u63a7\u5236GPIO\u7684\u7535\u5e73\uff0c\u7528shell\u547d\u4ee4\u5c31\u80fd\u5b9e\u73b0\u3002<\/p>\n\n\n\n

cd \/sys\/class\/gpio\/\necho 17 > export # \u6253\u5f00\u7aef\u53e317\necho out > gpio17\/direction # \u5c06\u7aef\u53e317\u8bbe\u7f6e\u4e3a\u7535\u5e73\u8f93\u51fa\u6a21\u5f0f\necho 1 > gpio17\/value # \u5c06\u7aef\u53e317\u8bbe\u7f6e\u4e3a\u9ad8\u7535\u5e73<\/code><\/pre>\n\n\n\n
\u6267\u884c\u4e0a\u8ff0\u4ee3\u7801\u540e\uff0c\u6211\u4eec\u53d1\u73b0\u7ea2\u8272LED\u706f\u5df2\u7ecf\u70b9\u4eae\u4e86\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u8981\u60f3\u5173\u6389\u4e5f\u5f88\u7b80\u5355\uff0c\u628a\u7aef\u53e317\u7f6e\u4e3a\u4f4e\u7535\u5e73\u5373\u53ef\uff08\u6700\u540e\uff0c\u5982\u679c17\u7aef\u53e3\u4e0d\u7528\u7684\u8bdd\uff0c\u53ef\u4ee5\u76f4\u63a5\u5173\u6389\uff09\uff1a<\/p>\n\n\n\n
echo 0 > gpio17\/value # \u5c06\u7aef\u53e317\u8bbe\u7f6e\u4e3a\u4f4e\u7535\u5e73\necho 17 > unexport<\/code><\/pre>\n\n\n\n
\u540c\u7406\uff0c\u6211\u4eec\u53ef\u4ee5\u5206\u522b\u63a7\u5236\u5176\u4ed6\u7aef\u53e3\uff0c\u6765\u8fbe\u5230\u63a7\u5236\u5176\u4ed6LED\u706f\u7684\u76ee\u7684\u3002<\/p>\n\n\n\n
\u7528\u7a0b\u5e8f\u4e5f\u80fd\u63a7\u5236\u3002<\/p>\n\n\n\n
python\u7248\u672c\uff1a<\/p>\n\n\n\n
import RPi.GPIO as GPIO\nimport time\n\n# LED GPIO\u7aef\u53e3 17\nLED_PIN = 17\n\nGPIO.setmode(GPIO.BCM)\nGPIO.setwarnings(False)\n\n# \u8bbe\u7f6e\u7aef\u53e3\u4e3a\u8f93\u51fa\u6a21\u5f0f\nGPIO.setup(LED_PIN, GPIO.OUT)\n\n# \u7535\u5e73\u8bbe\u7f6e\u4e3a\u9ad8\uff0c\u70b9\u4eaeLED\uff0c1\u79d2\u540e\u5173\u95ed\nGPIO.output(LED_PIN, GPIO.HIGH)\ntime.sleep(1)\nGPIO.output(LED_PIN, GPIO.LOW)<\/code><\/pre>\n\n\n\n
C\u8bed\u8a00\u7248\u672c\uff1a<\/p>\n\n\n\n
#include <bcm2835.h>\n#include <stdio.h>\n\n\/\/ gcc -o blink blink.c -lbcm2835\n\n#define PIN_R 17  \/\/ \u7ea2\u8272LED\u706fGPIO\u7aef\u53e3\n#define PIN_Y 27  \/\/ \u9ec4\n#define PIN_G 22  \/\/ \u7eff\n#define PIN_B 5   \/\/ \u84dd\n\nint main(int argc, char **argv)\n{\n    if (!bcm2835_init())\n      return 1;\n\n    bcm2835_gpio_fsel(PIN_R, BCM2835_GPIO_FSEL_OUTP);\n    bcm2835_gpio_fsel(PIN_Y, BCM2835_GPIO_FSEL_OUTP);\n    bcm2835_gpio_fsel(PIN_G, BCM2835_GPIO_FSEL_OUTP);\n    bcm2835_gpio_fsel(PIN_B, BCM2835_GPIO_FSEL_OUTP);\n    while (1)\n    {\n        bcm2835_gpio_write(PIN_R, HIGH); \/\/ \u5f00\u706f\n        bcm2835_delay(50);\n        bcm2835_gpio_write(PIN_R, LOW);  \/\/ \u5173\u706f\n        bcm2835_gpio_write(PIN_Y, HIGH);\n        bcm2835_delay(50);\n        bcm2835_gpio_write(PIN_Y, LOW);\n        bcm2835_gpio_write(PIN_G, HIGH);\n        bcm2835_delay(50);\n        bcm2835_gpio_write(PIN_G, LOW);\n        bcm2835_gpio_write(PIN_B, HIGH);\n        bcm2835_delay(50);\n        bcm2835_gpio_write(PIN_B, LOW);\n    }\n    bcm2835_close();\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u6ce8\u610f\uff1aC\u8bed\u8a00\u9700\u8981\u5b89\u88c5\u51fd\u6570\u5e93\u6587\u4ef6\uff0c\u4ece\u8fd9\u91cc<\/a>\u4e0b\u8f7d\u7f16\u8bd1\u5b89\u88c5\u5373\u53ef\uff1a<\/p>\n\n\n\n
tar czvf bcm2835-1.73.tar.gz\ncd bcm2835-1.73\n.\/configure\nmake -j\nmake install<\/code><\/pre>\n\n\n\n
*\u6811\u8393\u6d3e\u7684SOC\u662f\u535a\u901a\uff08Broadcom\uff09\u7684\uff0c\u56e0\u6b64\u9700\u5b89\u88c5\u535a\u901a\u5b98\u65b9\u63d0\u4f9b\u7684\u51fd\u6570\u5e93\u3002<\/p>\n\n\n\n
2.\u5168\u5f69LED\u706f<\/h1>\n\n\n\n
\u63a5\u4e0b\u6765\u6211\u4eec\u63a7\u5236\u8fd9\u51e0\u4e2a\u706f\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u8fd9\u51e0\u4e2a\u706f\u662f\u6709\u578b\u53f7\u7684\uff0c\u53eb\uff1aWS2812\uff0c\u63a7\u5236\u5b83\u4eec\u9700\u8981\u5b89\u88c5\u4e00\u4e2a\u7279\u6b8a\u7684\u51fd\u6570\u5e93rpi_ws281x\uff0c\u4f7f\u7528\u4e0b\u9762\u7684\u547d\u4ee4\u5b89\u88c5\u4ed6\u4eec\uff1a<\/p>\n\n\n\n
pip install rpi_ws281x<\/code><\/pre>\n\n\n\n
\u7136\u540e\u8fd0\u884c\u793a\u4f8b\u7a0b\u5e8f\u5373\u53ef\u770b\u5230\u8dd1\u9a6c\u706f\u7684\u6548\u679c\uff1a<\/p>\n\n\n\n
import time\nfrom rpi_ws281x import Adafruit_NeoPixel, Color\n\n# LED \u706f\u6761\u914d\u7f6e\nLED_COUNT      = 6      \t# \u706f\u73e0\u6570\u91cf\nLED_PIN        = 12      \t# GPIO\u5f15\u811a\nLED_FREQ_HZ    = 800000  \t# LED\u4fe1\u53f7\u9891\u7387\uff08\u901a\u5e38\u90fd\u662f800KHz\uff09\nLED_DMA        = 10       \t# \u7528\u4e8e\u4ea7\u751f\u4fe1\u53f7\u7684DMA\u4fe1\u9053\nLED_BRIGHTNESS = 2    \t\t# \u4eae\u5ea6\uff1a0\u6700\u4f4e\uff0c255\u6700\u9ad8\nLED_INVERT     = False   \t# \u662f\u5426\u53cd\u8f6c\u4fe1\u53f7\n\nstrip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS)\n\nwhile True:\n\tstrip.begin()\n\t# \u987a\u5e8f\u70b9\u4eae\uff0c\u84dd\u8272\u6e10\u53d8\n\tfor i in range(0, LED_COUNT):\n\t\tstrip.setPixelColor(i, \t Color(0,0,255))\n\t\tstrip.setPixelColor(i-1, Color(0,0,200))\n\t\tstrip.setPixelColor(i-2, Color(0,0,150))\n\t\tstrip.setPixelColor(i-3, Color(0,0,100))\n\t\tstrip.setPixelColor(i-4, Color(0,0,50))\n\t\tstrip.setPixelColor(i-5, Color(0,0,0))\n\t\tstrip.show()\n\t\ttime.sleep(0.05)\n\t#\u9006\u5e8f\uff0c\u7eff\u8272\n\tfor i in range(0, LED_COUNT):\n\t\tstrip.setPixelColor(LED_COUNT-i, Color(0,255,0))\n\t\tstrip.show()\n\t\ttime.sleep(0.05)\n\t#\u518d\u9006\u5e8f\uff0c\u7ea2\u8272\n\tfor i in range(0,LED_COUNT):\n\t\tstrip.setPixelColor(i, Color(255,0,0))\n\t\tstrip.show()\n\t\ttime.sleep(0.05)<\/code><\/pre>\n\n\n\n
3.\u547c\u5438\u706f<\/h1>\n\n\n\n
\u547c\u5438\u706f\u662f\u8fd9\u4e2a\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u63a7\u5236\u8fd9\u4e2a\u706f\uff0c\u6bd4\u524d\u9762\u7684\u51e0\u4e2a\u9ebb\u70e6\u4e9b\u3002<\/p>\n\n\n\n
\u9996\u5148\uff0c\u5b83\u9700\u8981\u5728\u6811\u8393\u6d3e\u4e0a\u5f00\u542fI2C\u603b\u7ebf\uff08\u4f7f\u7528raspi-config\u547d\u4ee4\uff09\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u7136\u540e\u9700\u8981\u5b89\u88c5\u4e24\u4e2a\u5e93\uff1a<\/p>\n\n\n\n
# \u5b89\u88c5\napt-get install i2c-tools\napt-get install python-smbus\n# \u8d4b\u6743\nusermod -aG i2c root<\/code><\/pre>\n\n\n\n
\u6267\u884c\u4e0b\u9762\u7684\u547d\u4ee4\u5c31\u53ef\u4ee5\u770b\u5230\u8fde\u63a5\u5728I2C\u603b\u7ebf\u7684\u5143\u4ef6\u5730\u5740\u4e86\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u53ef\u4ee5\u770b\u5230\u6709\u4e24\u4e2a\u5730\u5740\uff0c\u5176\u4e2d0x48\u5c31\u662f\u6211\u4eec\u8981\u70b9\u4eae\u7684LED\u5730\u5740\u4e86\uff0c0x3c\u662fOLD\u5c4f\u5e55\uff0c\u6211\u4eec\u5c06\u5728\u4e0b\u4e00\u7bc7\u6587\u7ae0\u4e2d\u7528\u5230\u3002<\/p>\n\n\n\n
\u7136\u540e\u8fd0\u884c\u793a\u4f8b\u7a0b\u5e8f\u5373\u53ef\u770b\u5230\u6548\u679c\uff1a<\/p>\n\n\n\n
import smbus\nimport time\n\naddr = 0x48 #LED\u7684I2C\u603b\u7ebf\u5730\u5740\ncmd  = 0x40\n\nbus = smbus.SMBus(1)\n\nbright = 0 # \u4eae\u5ea6\uff1a0~255\nwhile True:\n    bus.write_byte_data(addr, cmd, bright)\n    bright += 1\n    if bright == 255:\n        bright = 0\n    time.sleep(0.003)<\/code><\/pre>\n\n\n\n
C\u8bed\u8a00\u7248\u672c\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n
#include <bcm2835.h>\n#include <unistd.h>\n\n\/\/ gcc -o breathled breathled.c -lbcm2835\n\nint main(int argc, char **argv)\n{\n    if (!bcm2835_init())\n        return -1;\n\n    bcm2835_i2c_begin();\n    bcm2835_i2c_setSlaveAddress(0x48);  \/\/ \u901a\u4fe1\u5730\u5740\n    bcm2835_i2c_set_baudrate(10000);    \/\/ \u6ce2\u7279\u7387\n\n    char busbuf[2] = {0, 0};\n    unsigned char bright = 0;\n    unsigned char direct = 1;\n    while(1)\n    {\n        busbuf[0] = 0x40;       \/\/ LED\u706f\u7684\u5730\u5740\n        busbuf[1] = bright;     \/\/ \u706f\u7684\u4eae\u5ea6\n\n        bcm2835_i2c_write(busbuf, 2);\n        bcm2835_delay(5);\n\n        if (direct)\n            ++bright;\n        else\n            --bright;\n\n        if (bright == 0 || bright == 255)\n            direct = direct ? 0 : 1;\n    }\n\n    bcm2835_i2c_end();\n    bcm2835_close();\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n
\u8865\u5145\u77e5\u8bc6\uff1aI2C\u548csmbus<\/a><\/p>\n\n\n\n
\u5176\u5b9e\uff0c\u63a7\u5236\u8fd9\u4e2a\u547c\u5438\u706f\u4e4b\u6240\u4ee5\u590d\u6742\uff0c\u662f\u56e0\u4e3a\u5b83\u7528\u7684\u662f\u6a21\u62df\u4fe1\u53f7\uff0c\u800c\u6811\u8393\u6d3e\u7684GPIO\u53ea\u80fd\u8f93\u51fa\u7535\u4fe1\u53f7\uff0c\u5c06\u7535\u4fe1\u53f7\u8f6c\u6362\u4e3a\u6a21\u62df\u4fe1\u53f7\u9700\u8981\u4e00\u4e2a\u82af\u7247\uff0c\u6211\u4eec\u7528\u7684\u662f\u6269\u5c55\u677f\u4e2dPCF8591\u82af\u7247\uff0c\u4e0a\u8ff0\u4ee3\u7801\u5176\u5b9e\u5c31\u662f\u901a\u8fc7I2C\u603b\u7ebf\u5c06\u6811\u8393\u6d3e\u7684\u7535\u4fe1\u53f7\u4f20\u9012\u7ed9PCF8591\u82af\u7247\uff0c\u7136\u540e\u7531\u5176\u5c06\u6570\u5b57\u4fe1\u53f7\u8f6c\u6362\u4e3a\u6a21\u62df\u4fe1\u53f7\uff0c\u4ee5\u70b9\u4eaeLED\u706f\u3002<\/p>\n\n\n\n
\u9644\uff1aPCF8591\u82af\u7247\u4f4d\u7f6e<\/p>\n\n\n\n
\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"
1.\u5355\u8272LED\u706f \u70b9\u4eae\u5355\u8272LED\u706f\u65e0\u9700\u5b89\u88c5\u4efb\u4f55\u5e93\uff0c\u76f4\u63a5shell\u547d\u4ee4\u884c\u5c31\u884c\u3002 \u8fd9\u51e0\u4e2aLED\u706f\u90fd\u8fde\u63a5\u5728\u6811\u8393\u6d3e\u7684GPIO\uff08General-Purpose Input…<\/p>\n
 Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-4272","post","type-post","status-publish","format-standard","hentry","category-03-01-"],"_links":{"self":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/4272","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4272"}],"version-history":[{"count":0,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/4272\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4272"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4272"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4272"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}