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drivers/hygrometer/sht3x: extend alert range (#21521)

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This commit is contained in:
Roman Dvořák
2023-04-28 16:33:06 +02:00
committed by GitHub
parent eb8342b477
commit 8b4566b6bb
2 changed files with 25 additions and 3 deletions
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src/drivers/hygrometer/sht3x/sht3x.cpp
+19 -1
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@@ -1,6 +1,6 @@
/****************************************************************************
*
* Copyright (c) 2021 PX4 Development Team. All rights reserved.
* Copyright (c) 2021-2023 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -195,6 +195,24 @@ int SHT3X::init_sensor()
PX4_INFO("Connected to SHT3x sensor, SN: %ld", _sht_info.serial_number);
// Modify ALERT range values to minimalize ALERT led heating.
// def temp(t):
// return ((t+45)*(2**16-1))/175
// def hum(h):
// return (h/100)*(2**16-1)
//
// hex((int(hum(80))>>9<<9) | (int(temp(60))>>7))
uint8_t sh[] {0xff, 0xe2};
uint8_t ch[] {0xfb, 0xdc};
uint8_t sl[] {0x00, 0x0e};
uint8_t cl[] {0x04, 0x14};
write_data(SHT3x_CMD_ALERT_W_SET_HIGH, sh, 2); // 100%, 120C
write_data(SHT3x_CMD_ALERT_W_CLEAR_HIGH, ch, 2); // 98%, 118C
write_data(SHT3x_CMD_ALERT_W_SET_LOW, sl, 2); // 0%, -40C
write_data(SHT3x_CMD_ALERT_W_CLEAR_LOW, cl, 2); // 2%, -38C
return PX4_OK;
}
src/drivers/hygrometer/sht3x/sht3x.h
+6 -2
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@@ -53,9 +53,13 @@
#define SHT3X_CMD_READ_STATUS 0xF32D
#define SHT3X_CMD_CLEAR_STATUS 0x3041
#define SHT3x_CMD_PERIODIC_2HZ_MEDIUM 0x2220
#define SHT3x_CMD_PERIODIC_2HZ_MEDIUM 0x2220
#define SHT3x_CMD_FETCH_DATA 0xE000
#define SHT3x_CMD_READ_SN 0x3780
#define SHT3x_CMD_READ_SN 0x3780
#define SHT3x_CMD_ALERT_W_SET_HIGH 0x611D
#define SHT3x_CMD_ALERT_W_SET_LOW 0x6100
#define SHT3x_CMD_ALERT_W_CLEAR_HIGH 0x6116
#define SHT3x_CMD_ALERT_W_CLEAR_LOW 0x610B
using namespace time_literals;