main.cpp

00001 /* MAX44000 Ambient Light Sensor / Proximity Sensor Demo
00002  * This demonstrates some of the capabilities of the MAX44000.
00003  *
00004  * This is written to work with the ARD2PMD adapter board and
00005  * the MAX44000PMB1.  It uses the standard Arduino pin names
00006  * and it will compile for most arduino form-factor mbed boards.
00007  *
00008  * LED1 toggles when something is first detected by the proximity sensor.
00009  * LED2 indicates when the Ambient Light Sensor reads grater than alsLim.
00010  * LED3 will stay on whenever something is detected by the proximity sensor
00011  *   and stay on for an additional 5s after it is no longer detected.
00012  *
00013  * The following boards have been tested to work:
00014  *   MAX32600MBED
00015  *
00016  * Some boards use D13 for an LED signal, so this example uses the second
00017  *   row (row B, pins 7 through 12) of the Pmod connector.
00018  */
00019 
00020 #include "mbed.h"
00021 #include "ard2pmod.h"
00022 #include "MAX44000.h"
00023 
00024 MAX44000 max44000(D14, D15);
00025 DigitalOut tog(LED1);
00026 DigitalOut als(LED2);
00027 DigitalOut dly(LED3);
00028 DigitalIn pb3(D6);  // Set as input to remove load from PB3
00029 DigitalIn pb4(D7);  // Set as input to remove load from PB4
00030 
00031 const int alsLim = 0x0008;
00032 
00033 int main()
00034 {
00035     Ard2Pmod ard2pmod(Ard2Pmod::PMOD_TYPE_I2C_B);  // Configure ard2pmod multiplexer for I2C row B (bottom row)
00036 
00037     max44000.init(MAX44000::MODE_ALS_PROX, MAX44000::ALSTIM_64X, MAX44000::ALSPGA_1X, MAX44000::DRV_10);
00038 
00039     bool lastProx = false;
00040     int offDelay = 0;
00041     tog = false;
00042     als = false;
00043     dly = false;
00044 
00045     while (true) {
00046         wait (0.02);
00047         int alsData = max44000.readALS();
00048         int proxData = max44000.readReg(MAX44000::REG_PRX_DATA);
00049 
00050         als = (alsData < alsLim);
00051 
00052         if (proxData) {
00053             if (!lastProx) {
00054                 tog = !tog;
00055             }
00056             lastProx = true;
00057             offDelay = 250;
00058             dly = false;
00059         } else {
00060             lastProx = false;
00061         }
00062         if (offDelay > 0) {
00063             offDelay -= 1;
00064         } else {
00065             dly = true;
00066         }
00067     }
00068 }