From 1aefd46ac6b3dcca2af20a85f293812d4ae5a28a Mon Sep 17 00:00:00 2001
From: Gerardo Marx <gmarx_cc@itmorelia.edu.mx>
Date: Thu, 1 Oct 2026 10:45:43 -0600
Subject: [PATCH] adding the htu21d.h file

---
 htu21d.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 htu21d.h

diff --git a/htu21d.h b/htu21d.h
new file mode 100644
index 0000000..7e08668
--- /dev/null
+++ b/htu21d.h
@@ -0,0 +1,19 @@
+// Gerardo Marx 1/oct/2026
+// HTU21D temperature and humidity sensor library
+// tested in a raspberry pi zero w
+
+#ifndef HTU21D_H
+#define HTU21D_H
+
+// commands and i2c address
+#define ADDR 0x40 //i2c address
+#define HUM 0xE5 // hold master humidity command
+#define TEMP 0xE3
+#define RESET 0xFE
+
+// prototype functions:
+int getTemp(int fd, double *temp);
+
+int getHum(int fd, double *hum);
+
+#endif // THU21D_H