Greg Steiert / Mbed 2 deprecated ALS_Proximity_Demo

This demonstrates some of the capabilities of the MAX44000. It is written to work with the ARD2PMD adapter board and the MAX44000PMB1. It uses the standard Arduino pin names and will compile for most Arduino form-factor mbed boards.

Dependencies:   ard2pmod mbed

This demonstrates some of the capabilities of the MAX44000.

This is written to work with the ARD2PMD adapter board and the MAX44000PMB1. It uses the standard Arduino pin names and it will compile for most Arduino form-factor mbed boards.

Some boards use D13 for an LED signal, so this example uses the second row (row B, pins 7 through 12) of the Pmod connector.

  • LED1 toggles when something is first detected by the proximity sensor.
  • LED2 indicates when the Ambient Light Sensor reads grater than alsLim.
  • LED3 will stay on whenever something is detected by the proximity sensor and stay on for an additional 5s after it is no longer detected.

The following boards have been tested to work:

  • MAX32600MBED
  • FRDM-KL25Z
  • FRDM-K64F
  • Seeeduino Arch (LEDs inverted)
  • Seeeduino Arch Pro
  • ST Nucleo F401RE (only one LED, inverted)

Files at this revision

API Documentation at this revision

Revision 4:226ef11c3ef4, committed 2014-06-30

Comitter:
gsteiert
Date:
Mon Jun 30 22:32:02 2014 +0000
Parent:
3:61cc32322303
Child:
5:2a360754fea6
Commit message:
Fixed ALS data reading

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Mon Jun 23 05:30:26 2014 +0000
+++ b/main.cpp	Mon Jun 30 22:32:02 2014 +0000
@@ -33,18 +33,19 @@
 DigitalIn pb4(D7);  // Set as input to remove load from PB4
 
 const int alsAddr = 0x94;
-const char alsLim = 0x01;
+const int alsLim = 0x0008;
 
 int main()
 {
     char cmd[2];
+    int alsData;
 
     //  SDA (D14) + PB4 (D7)     SCL (D15) + PB3 (D6)
     mux.setAB((MAX14661::SW10 | MAX14661::SW08),
               (MAX14661::SW09 | MAX14661::SW07));
 
     cmd[0] = 0x02;  // Receive Register
-    cmd[1] = 0xFF;  // 1.56ms, 128x
+    cmd[1] = 0xFC;  // 1.56ms, 1x
     i2c.write(alsAddr, cmd, 2);
 
     cmd[0] = 0x03;  // Transmit Register
@@ -63,13 +64,14 @@
 
     while (true) {
         wait (0.02);
-        cmd[0] = 0x04; // ALS Data Register
-        i2c.write(alsAddr, cmd, 1);
+        cmd[0] = 0x05; // ALS Data Register Low
+        i2c.write(alsAddr, cmd, 1, true);
         i2c.read(alsAddr, cmd, 1);
-        als = (cmd[0] < alsLim);
+        alsData = cmd[0];
+        als = (alsData < alsLim);
 
         cmd[0] = 0x16; // Prox Data Register
-        i2c.write(alsAddr, cmd, 1);
+        i2c.write(alsAddr, cmd, 1, true);
         i2c.read(alsAddr, cmd, 1);
         if (cmd[0]) {
             if (!lastProx) {