You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
234 lines
7.2 KiB
234 lines
7.2 KiB
// -----------------------------------------------------------------------------
|
|
// DHT Sensor
|
|
// -----------------------------------------------------------------------------
|
|
|
|
#pragma once
|
|
|
|
#include "Arduino.h"
|
|
#include "BaseSensor.h"
|
|
#include <vector>
|
|
#include <OneWire.h>
|
|
|
|
#define DS_CHIP_DS18S20 0x10
|
|
#define DS_CHIP_DS1822 0x22
|
|
#define DS_CHIP_DS18B20 0x28
|
|
#define DS_CHIP_DS1825 0x3B
|
|
|
|
#define DS_PARASITE 1
|
|
#define DS_DISCONNECTED -127
|
|
|
|
#define DS_CMD_START_CONVERSION 0x44
|
|
#define DS_CMD_READ_SCRATCHPAD 0xBE
|
|
|
|
#define DS_ERROR_NOT_FOUND -1
|
|
#define DS_ERROR_FAILED_RESET -2
|
|
#define DS_ERROR_FAILED_READ -3
|
|
#define DS_ERROR_CRC -4
|
|
|
|
class DallasSensor : public BaseSensor {
|
|
|
|
public:
|
|
|
|
DallasSensor(unsigned char gpio, unsigned long interval, bool pull_up = false): BaseSensor() {
|
|
|
|
// Cache params
|
|
_gpio = gpio;
|
|
_interval = interval / 2;
|
|
|
|
// OneWire
|
|
_wire = new OneWire(_gpio);
|
|
|
|
// Must be done after the OneWire initialization
|
|
if (pull_up) pinMode(_gpio, INPUT_PULLUP);
|
|
|
|
// Search devices
|
|
loadDevices();
|
|
|
|
}
|
|
|
|
// Loop-like method, call it in your main loop
|
|
void tick() {
|
|
|
|
static unsigned long last = 0;
|
|
if (millis() - last < _interval) return;
|
|
last = millis();
|
|
|
|
// Every second we either start a conversion or read the scratchpad
|
|
static bool conversion = true;
|
|
if (conversion) {
|
|
|
|
// Start conversion
|
|
_wire->reset();
|
|
_wire->skip();
|
|
_wire->write(DS_CMD_START_CONVERSION, DS_PARASITE);
|
|
|
|
} else {
|
|
|
|
// Read scratchpads
|
|
for (unsigned char index=0; index<_devices.size(); index++) {
|
|
|
|
// Read scratchpad
|
|
if (_wire->reset() == 0) {
|
|
_error = DS_ERROR_FAILED_RESET;
|
|
return;
|
|
}
|
|
|
|
_wire->select(_devices[index].address);
|
|
_wire->write(DS_CMD_READ_SCRATCHPAD);
|
|
|
|
uint8_t data[9];
|
|
for (unsigned char i = 0; i < 9; i++) {
|
|
data[i] = _wire->read();
|
|
}
|
|
|
|
#if false
|
|
Serial.printf("[DS18B20] Data = ");
|
|
for (unsigned char i = 0; i < 9; i++) {
|
|
Serial.printf("%02X ", data[i]);
|
|
}
|
|
Serial.printf(" CRC = %02X\n", OneWire::crc8(data, 8));
|
|
#endif
|
|
|
|
|
|
if (_wire->reset() != 1) {
|
|
_error = DS_ERROR_FAILED_READ;
|
|
return;
|
|
}
|
|
|
|
if (OneWire::crc8(data, 8) != data[8]) {
|
|
_error = DS_ERROR_CRC;
|
|
return;
|
|
}
|
|
|
|
memcpy(_devices[index].data, data, 9);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
conversion = !conversion;
|
|
|
|
}
|
|
|
|
|
|
// Descriptive name of the sensor
|
|
String name() {
|
|
char buffer[20];
|
|
snprintf(buffer, sizeof(buffer), "Dallas @ GPIO%d", _gpio);
|
|
return String(buffer);
|
|
}
|
|
|
|
// Descriptive name of the slot # index
|
|
String slot(unsigned char index) {
|
|
_error = SENSOR_ERROR_OK;
|
|
if (index < _count) {
|
|
char buffer[40];
|
|
uint8_t * address = _devices[index].address;
|
|
snprintf(buffer, sizeof(buffer), "%s (%02X%02X%02X%02X%02X%02X%02X%02X) @ GPIO%d",
|
|
chipAsString(index).c_str(),
|
|
address[0], address[1], address[2], address[3],
|
|
address[4], address[5], address[6], address[7],
|
|
_gpio
|
|
);
|
|
return String(buffer);
|
|
}
|
|
_error = SENSOR_ERROR_OUT_OF_RANGE;
|
|
return String();
|
|
}
|
|
|
|
// Type for slot # index
|
|
magnitude_t type(unsigned char index) {
|
|
_error = SENSOR_ERROR_OK;
|
|
if (index < _count) return MAGNITUDE_TEMPERATURE;
|
|
_error = SENSOR_ERROR_OUT_OF_RANGE;
|
|
return MAGNITUDE_NONE;
|
|
}
|
|
|
|
// Current value for slot # index
|
|
double value(unsigned char index) {
|
|
|
|
if (index >= _count) {
|
|
_error = SENSOR_ERROR_OUT_OF_RANGE;
|
|
return 0;
|
|
}
|
|
|
|
uint8_t * data = _devices[index].data;
|
|
|
|
// Registers
|
|
// byte 0: temperature LSB
|
|
// byte 1: temperature MSB
|
|
// byte 2: high alarm temp
|
|
// byte 3: low alarm temp
|
|
// byte 4: DS18S20: store for crc
|
|
// DS18B20 & DS1822: configuration register
|
|
// byte 5: internal use & crc
|
|
// byte 6: DS18S20: COUNT_REMAIN
|
|
// DS18B20 & DS1822: store for crc
|
|
// byte 7: DS18S20: COUNT_PER_C
|
|
// DS18B20 & DS1822: store for crc
|
|
// byte 8: SCRATCHPAD_CRC
|
|
|
|
int16_t raw = (data[1] << 8) | data[0];
|
|
if (chip(index) == DS_CHIP_DS18S20) {
|
|
raw = raw << 3; // 9 bit resolution default
|
|
if (data[7] == 0x10) {
|
|
raw = (raw & 0xFFF0) + 12 - data[6]; // "count remain" gives full 12 bit resolution
|
|
}
|
|
} else {
|
|
byte cfg = (data[4] & 0x60);
|
|
if (cfg == 0x00) raw = raw & ~7; // 9 bit res, 93.75 ms
|
|
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
|
|
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
|
|
// 12 bit res, 750 ms
|
|
}
|
|
|
|
_error = SENSOR_ERROR_OK;
|
|
return (float) raw / 16.0;
|
|
|
|
}
|
|
|
|
protected:
|
|
|
|
unsigned char chip(unsigned char index) {
|
|
if (index < _count) return _devices[index].address[0];
|
|
return 0;
|
|
}
|
|
|
|
String chipAsString(unsigned char index) {
|
|
unsigned char chip_id = chip(index);
|
|
if (chip_id == DS_CHIP_DS18S20) return String("DS18S20");
|
|
if (chip_id == DS_CHIP_DS18B20) return String("DS18B20");
|
|
if (chip_id == DS_CHIP_DS1822) return String("DS1822");
|
|
if (chip_id == DS_CHIP_DS1825) return String("DS1825");
|
|
return String("Unknown");
|
|
}
|
|
|
|
void loadDevices() {
|
|
|
|
uint8_t address[8];
|
|
_wire->reset_search();
|
|
while (_wire->search(address)) {
|
|
|
|
// Check CRC
|
|
if (_wire->crc8(address, 7) == address[7]) {
|
|
ds_device_t device;
|
|
memcpy(device.address, address, 8);
|
|
_devices.push_back(device);
|
|
}
|
|
|
|
}
|
|
_count = _devices.size();
|
|
|
|
}
|
|
|
|
typedef struct {
|
|
uint8_t address[8];
|
|
uint8_t data[9];
|
|
} ds_device_t;
|
|
std::vector<ds_device_t> _devices;
|
|
|
|
unsigned char _gpio;
|
|
unsigned long _interval;
|
|
OneWire * _wire;
|
|
|
|
};
|