Silicon Labs / Si1133

Driver for the Silicon Labs Si1133 Visible Light/UV sensor

Dependents:   TBSense2_Sensor_Demo mbed-BLE-coragem-teste Pulga_BLE_GPS pulga-mbed-lorawan-gps ... more

Sample library for use with the Silicon Labs Si1133 sensor for visible light intensity (lux) and UV index measurements.

Information

All examples in this repo are considered EXPERIMENTAL QUALITY, meaning this code has been created as one-off proof-of-concept and is suitable as a demonstration for experimental purposes only. This code will not be regularly maintained by Silicon Labs and there is no guarantee that these projects will work across all environments, SDK versions and hardware.

Datasheet

https://www.silabs.com/documents/public/data-sheets/Si1133.pdf

Usage

#include "mbed.h"
#include "Si1133.h"
//Create an Si1133 object
Si1133 sensor(PC4, PC5);
int main()
{
    //Try to open the Si1133
    if (sensor.open()) {
        printf("Device detected!\n");
        while (1) {
            //Print the current light level
            printf("Lux = %.3f\n", (float)sensor.get_light_level());
            //Print the current UV index
            printf("UV index = %.3f\n", (float)sensor.get_uv_index());
            //Sleep for 0.5 seconds
            wait(0.5);
        }
    } else {
        error("Device not detected!\n");
    }
}

Files at this revision

API Documentation at this revision

Revision 3:f780ca9105bb, committed 2019-03-22

Comitter:
Steven Cooreman
Date:
Fri Mar 22 00:51:29 2019 +0100
Parent:
2:1e2dd643afa8
Commit message:
remove VLA usage

Changed in this revision

Si1133.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r 1e2dd643afa8 -r f780ca9105bb Si1133.cpp
--- a/Si1133.cpp	Sun Nov 12 20:18:04 2017 +0100
+++ b/Si1133.cpp	Fri Mar 22 00:51:29 2019 +0100
@@ -222,10 +222,15 @@
  ******************************************************************************/
 uint32_t Si1133::write_register_block(enum Si1133::Register reg, uint8_t length, uint8_t *data)
 {
-    char buf[length+1];
+    char buf[3];
     buf[0] = (char)reg;
+
+    if (length > 2) {
+        return SI1133_ERROR_I2C_TRANSACTION_FAILED;
+    }
+
     memcpy(&buf[1], data, length);
-    
+
     if (m_I2C.write(SI1133_I2C_ADDRESS, buf, length + 1)) {
         //Return failure
         return SI1133_ERROR_I2C_TRANSACTION_FAILED;
@@ -528,7 +533,7 @@
     if (count >= 5) {
         return SI1133_ERROR_I2C_TRANSACTION_FAILED;
     }
-    
+
     return SI1133_OK;
 }