【传感器套件试用5-照度接近传感器RPR-0521使用评测】

andeyqi · 发表于 2019-8-8 11:26:49

本帖最后由 andeyqi 于 2019-8-8 11:26 编辑

RPR-0521RS是将光学式接近传感器和红外LED（IrLED）、数字照度传感器整合在1chip中的模块。
接近传感器 (PS)通过对IrLED发射光线的接近物产生的反射光，检测出人及物体的接近。另外，照度传感器(ALS)可测量从昏暗光线到直射日光的广泛照度。根据照度数据调整LCD显示器及按键的亮度，从而提高组件的节电性能和画面的可视性。

RPR-0521RS系列光学传感器特点：

·兼容I2C BUS接口（支持f/s模式）；

·兼容1.8V逻辑接口；

·掉电模式下，电流损耗低；

·有两种ALS输出值：可见光（Data0）对应光谱响应峰值；红外线光（Data1）对应光照度计算。

·能检测到从黑暗环境乃至直接太阳光照的环境范围，具有广泛的照度测量；

·具有抑制（工频）50Hz/60Hz光噪声（ALS功能下）；

·光学接近传感探测范围在1~100mm(可通过I2C接口调整)；

·内置电流配置的IrLED驱动器；

·提供卷带包装，符合RoHS欧盟标准。

RPR-0521RS系列光学传感器应用：

·智能手机

·移动手机

·数码相机

·便携式游戏机

·摄像—录影一体机

·PDA

·LCD显示屏

模块原理图如下：

内部寄存器map如下及框图.

I2C时序及从机地址（0x38）如下.

寄存器描述：

bit7-设置为1，bit6-设置为0即可，bit5设置脉冲宽度按照默认即可，bit4设置为为默认值bit0-3设定测量时间。

距离传感器和光照传感器模式设定。

根据官方的测试代码移植到rtthrad,测试代码如下：

#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#include <stdio.h>
#include "finsh.h"
#include "i2c_utilise.h"
#include "rpr0521.h"
unsigned short _als_data0_gain;
unsigned short _als_data1_gain;
unsigned short _als_measure_time;
void rpr0521_init(void)
{
struct rt_i2c_bus_device* bus = NULL;
rt_uint8_t deviceid = 0,reg = 0,partid = 0;
rt_uint8_t buff[2] = {0};
unsigned char index;
unsigned char als_gain_table[] = {1, 2, 64, 128};
unsigned short als_meas_time_table[] = {0,0,0,0,0,100,100,100,100,100,400,400,50,0,0,0};
bus = rt_i2c_bus_device_find("i2c1");
if(!bus)
{
rt_kprintf("can't find i2c device\n");
return ;
}
write_cmd(bus,RPR0521RS_DEVICE_ADDRESS,RPR0521RS_SYSTEM_CONTROL);
read_reg(bus,RPR0521RS_DEVICE_ADDRESS,1,&partid);
if((partid&0x3f) != RPR0521RS_PART_ID_VAL)
{
rt_kprintf("partid is not right 0x%x\n",partid);
return;
}
write_cmd(bus,RPR0521RS_DEVICE_ADDRESS,RPR0521RS_MANUFACT_ID);
read_reg(bus,RPR0521RS_DEVICE_ADDRESS,1,®);
if(reg != RPR0521RS_MANUFACT_ID_VAL)
{
rt_kprintf("manufactid is not right 0x%x\n",reg);
return;
}
/* RPR0521RS_ALS_PS_CONTROL_DATA0_GAIN_X1
RPR0521RS_ALS_PS_CONTROL_DATA1_GAIN_X1
RPR0521RS_ALS_PS_CONTROL_LED_CURRENT_100MA
*/
write_reg(bus,RPR0521RS_DEVICE_ADDRESS,RPR0521RS_ALS_PS_CONTROL,RPR0521RS_ALS_PS_CONTROL_VAL);
/* set RPR0521RS_PS_CONTROL_PS_GAINX1 */
write_cmd(bus,RPR0521RS_DEVICE_ADDRESS,RPR0521RS_PS_CONTROL);
read_reg(bus,RPR0521RS_DEVICE_ADDRESS,1,®);
rt_kprintf("read RPR0521RS_PS_CONTROL data is 0x%x\n",reg);
reg |= RPR0521RS_PS_CONTROL_VAL;
write_reg(bus,RPR0521RS_DEVICE_ADDRESS,RPR0521RS_PS_CONTROL,reg);
rt_kprintf("write RPR0521RS_PS_CONTROL data is 0x%x\n",reg);
/*
RPR0521RS_MODE_CONTROL_MEASTIME_100_100MS
RPR0521RS_MODE_CONTROL_PS_EN
RPR0521RS_MODE_CONTROL_ALS_EN
*/
reg = RPR0521RS_MODE_CONTROL_VAL;
write_reg(bus,RPR0521RS_DEVICE_ADDRESS,RPR0521RS_MODE_CONTROL,reg);
reg = RPR0521RS_ALS_PS_CONTROL_VAL;
index = (reg >> 4) & 0x03;
_als_data0_gain = als_gain_table[index];
index = (reg >> 2) & 0x03;
_als_data1_gain = als_gain_table[index];
index = RPR0521RS_MODE_CONTROL_VAL & 0x0F;
_als_measure_time = als_meas_time_table[index];
}
void get_rawpsalsval(unsigned char *data)
{
struct rt_i2c_bus_device* bus = NULL;
rt_uint8_t status = 0;
bus = rt_i2c_bus_device_find("i2c1");
if(!bus)
{
rt_kprintf("can't find i2c device\n");
return ;
}
write_cmd(bus,RPR0521RS_DEVICE_ADDRESS,RPR0521RS_PS_DATA_LSB);
read_reg(bus,RPR0521RS_DEVICE_ADDRESS,6,data);
}
float convert_lx(unsigned short *data)
{
float lx;
float d0, d1, d1_d0;
if (_als_data0_gain == 0) {
return (RPR0521RS_ERROR);
}
if (_als_data1_gain == 0) {
return (RPR0521RS_ERROR);
}
if (_als_measure_time == 0) {
return (RPR0521RS_ERROR);
} else if (_als_measure_time == 50) {
if ((data[0] & 0x8000) == 0x8000) {
data[0] = 0x7FFF;
}
if ((data[1] & 0x8000) == 0x8000) {
data[1] = 0x7FFF;
}
}
d0 = (float)data[0] * (100 / _als_measure_time) / _als_data0_gain;
d1 = (float)data[1] * (100 / _als_measure_time) / _als_data1_gain;
if (d0 == 0) {
lx = 0;
return (lx);
}
d1_d0 = d1 / d0;
if (d1_d0 < 0.595) {
lx = (1.682 * d0 - 1.877 * d1);
} else if (d1_d0 < 1.015) {
lx = (0.644 * d0 - 0.132 * d1);
} else if (d1_d0 < 1.352) {
lx = (0.756 * d0 - 0.243 * d1);
} else if (d1_d0 < 3.053) {
lx = (0.766 * d0 - 0.25 * d1);
} else {
lx = 0;
}
return (lx);
}
void get_psalsval(unsigned short *ps, float *als)
{
unsigned char val[6];
unsigned short rawps;
unsigned short rawals[2];
get_rawpsalsval(val);
rawps = ((unsigned short)val[1] << 8) | val[0];
rawals[0] = ((unsigned short)val[3] << 8) | val[2];
rawals[1] = ((unsigned short)val[5] << 8) | val[4];
*ps = rawps;
*als = convert_lx(rawals);
}
unsigned char check_near_far(unsigned short data)
{
if (data >= RPR0521RS_NEAR_THRESH) {
return (RPR0521RS_NEAR_VAL);
} else {
return (RPR0521RS_FAR_VAL);
}
}
long rpr0521(void)
{
static rt_uint8_t isinit = 0;
rt_uint16_t count = 1000;
float data[3] = {0.0};
char buff[50] = {0};
unsigned short ps_val;
float als_val;
unsigned char near_far;
if(!isinit)
{
rpr0521_init();
isinit =1;
}
while(count--)
{
get_psalsval(&ps_val, &als_val);
near_far = check_near_far(ps_val);
if (near_far == RPR0521RS_NEAR_VAL)
{
rt_kprintf(" Near\n");
}
else
{
rt_kprintf(" Far\n");
}
if (als_val != RPR0521RS_ERROR) {
sprintf(buff,"=%.3f",als_val);
rt_kprintf(" RPR-0521RS (Ambient Light) %s\n",buff);
rt_thread_mdelay(500);
}
}
return 0;
}
FINSH_FUNCTION_EXPORT(rpr0521, show rpr0521 data);
MSH_CMD_EXPORT(rpr0521, show rpr0521 data);

复制代码

测试时发现，靠近的话会输出near,改变光照强度对应的强度值会发生变化,输出如下：

程序和芯片手册如下。

rpr-0521rs-e.pdf (926.17 KB, 下载次数: 2)

[活动] 【传感器套件试用5-照度接近传感器RPR-0521使用评测】

站长推荐 /2