From fcfb88f7bb207b825c3f59a8a0859f1e9146420c Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Wed, 03 Nov 2021 22:55:08 +0800
Subject: [PATCH] update ds18b20.c, add pin connected way
---
modules/c/ds18b20.c | 18 ++++++++++++++++--
1 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/modules/c/ds18b20.c b/modules/c/ds18b20.c
index 447bf28..29fbdc3 100644
--- a/modules/c/ds18b20.c
+++ b/modules/c/ds18b20.c
@@ -8,8 +8,20 @@
* Version: 1.0.0(2018/10/14)
* Author: Guo Wenxue <guowenxue@gmail.com>
* ChangeLog: 1, Release initial version on "2018/10/14 12:13:26"
- *
+ *
+ *
+ * Pin connection:
+ *
+ * vcc --- #Pin1 ( 3.3v )
+ * DQ --- #Pin7 (BCM GPIO4)
+ * GND --- #Pin9 ( GND )
+ *
+ * /boot/config.txt:
+ *
+ * dtoverlay=w1-gpio-pullup,gpiopin=4
+ *
********************************************************************************/
+
#include <stdio.h>
#include <stdlib.h>
@@ -32,7 +44,7 @@
return 1;
}
- printf("DS19B20 get temperature: %f ℃\n", temp);
+ printf("DS18B20 get temperature: %f ℃\n", temp);
return 0;
}
@@ -116,5 +128,7 @@
/* convert string value to float value */
*temp = atof(ptr)/1000;
+ close(fd);
+
return 0;
}
--
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