Ltr553
The M5CoreS3 comes with a built-in LTR553 proximity sensor. Reference the API & examples below to implement proximity state reading.
begin()
Functionality:
- Initializes the proximity sensor
Prototype:
bool begin(Ltr5xx_Init_Basic_Para *init_base_para)
bool begin(Ltr5xx_Init_Interrupt_Para *init_interrupt_para)
Parameters:
| Parameter | Type | Description |
|---|---|---|
| init_base_para | Ltr5xx_Init_Basic_Para * | Basic monitoring initialization |
| init_interrupt_para | Ltr5xx_Init_Interrupt_Para * | Interrupt monitoring initialization |
Return Values:
| Return Value | Description |
|---|---|
| true | Initialization successful |
| false | Initialization failed |
setPsMode()
Functionality:
- Initializes the proximity sensor
Prototype:
bool setPsMode(uint8_t mode)
Parameters:
| Parameter | Type | Description |
|---|---|---|
| mode | uint8_t | 1: Enable proximity sensor monitoring 0: Sensor standby |
Return Values:
| Return Value | Description |
|---|---|
| true | Initialization successful |
| false | Initialization failed |
setAlsMode()
Functionality:
- Initializes the proximity sensor
Prototype:
bool setAlsMode(uint8_t mode)
Parameters:
| Parameter | Type | Description |
|---|---|---|
| mode | uint8_t | 1: Enable ambient light sensor monitoring 0: Sensor standby |
Return Values:
| Return Value | Description |
|---|---|
| true | Initialization successful |
| false | Initialization failed |
getPsValue()
Functionality:
- Retrieves the proximity sensor value
Prototype:
uint16_t getPsValue(void)
Parameters:
None
Return Values:
| Return Value | Description |
|---|---|
| uint16_t | Monitored proximity value |
getAlsValue()
Functionality:
- Retrieves the ambient light sensor value
Prototype:
uint16_t getAlsValue(void)
Parameters:
None
Return Values:
| Return Value | Description |
|---|---|
| uint16_t | Monitored ambient light lux |
Example Usage:
#include "M5CoreS3.h"
Ltr5xx_Init_Basic_Para device_init_base_para = LTR5XX_BASE_PARA_CONFIG_DEFAULT;
uint16_t read_ps_value;
uint16_t read_als_value;
void setup() {
auto cfg = M5.config();
CoreS3.begin(cfg);
CoreS3.Display.setTextColor(GREEN);
CoreS3.Display.setTextDatum(middle_center);
CoreS3.Display.setFont(&fonts::Orbitron_Light_24);
CoreS3.Display.setTextSize(1);
device_init_base_para.ps_led_pulse_freq = LTR5XX_LED_PULSE_FREQ_40KHZ;
device_init_base_para.ps_measurement_rate = LTR5XX_PS_MEASUREMENT_RATE_50MS;
device_init_base_para.als_gain = LTR5XX_ALS_GAIN_48X;
if (!CoreS3.Ltr553.begin(&device_init_base_para)) {
CoreS3.Display.drawString("Ltr553 Init Fail",
CoreS3.Display.width() / 2,
CoreS3.Display.height() / 2);
while (1) {
delay(10);
}
}
CoreS3.Display.drawString("Ltr553 Init Success", CoreS3.Display.width() / 2,
CoreS3.Display.height() / 2);
// Activate proximity sensor
CoreS3.Ltr553.setPsMode(LTR5XX_PS_ACTIVE_MODE);
// Activate ambient light sensor
CoreS3.Ltr553.setAlsMode(LTR5XX_ALS_ACTIVE_MODE);
// Deactivate proximity sensor
// CoreS3.Ltr553.setPsMode(LTR5XX_PS_STAND_BY_MODE);
// Deactivate ambient light sensor
// CoreS3.Ltr553.setAlsMode(LTR5XX_ALS_STAND_BY_MODE);
}
void loop() {
CoreS3.Display.clear();
read_ps_value = CoreS3.Ltr553.getPsValue();
read_als_value = CoreS3.Ltr553.getAlsValue();
CoreS3.Display.drawString(
"PS:" + String(read_ps_value) + " / " + "ALS:" + String(read_als_value),
CoreS3.Display.width() / 2, CoreS3.Display.height
() / 2);
Serial.printf("ps value = %d\r\n", read_ps_value);
Serial.printf("als value = %d\r\n", read_als_value);
delay(100);
}