/
xsns_ds18x20.ino
238 lines (210 loc) · 6.94 KB
/
xsns_ds18x20.ino
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
/*
xsns_ds18x20.ino - DS18x20 temperature sensor support for Sonoff-Tasmota
Copyright (C) 2017 Heiko Krupp and Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_DS18x20
/*********************************************************************************************\
* DS18B20 - Temperature
\*********************************************************************************************/
#define DS18S20_CHIPID 0x10
#define DS18B20_CHIPID 0x28
#define MAX31850_CHIPID 0x3B
#define W1_SKIP_ROM 0xCC
#define W1_CONVERT_TEMP 0x44
#define W1_READ_SCRATCHPAD 0xBE
#define DS18X20_MAX_SENSORS 8
#include <OneWire.h>
OneWire *ds = NULL;
uint8_t ds18x20_addr[DS18X20_MAX_SENSORS][8];
uint8_t ds18x20_idx[DS18X20_MAX_SENSORS];
uint8_t ds18x20_snsrs = 0;
char dsbstype[9];
void ds18x20_init()
{
ds = new OneWire(pin[GPIO_DSB]);
}
void ds18x20_search()
{
uint8_t num_sensors=0;
uint8_t sensor = 0;
uint8_t i;
ds->reset_search();
for (num_sensors = 0; num_sensors < DS18X20_MAX_SENSORS; num_sensors) {
if (!ds->search(ds18x20_addr[num_sensors])) {
ds->reset_search();
break;
}
// If CRC Ok and Type DS18S20, DS18B20 or MAX31850
if ((OneWire::crc8(ds18x20_addr[num_sensors], 7) == ds18x20_addr[num_sensors][7]) &&
((ds18x20_addr[num_sensors][0]==DS18S20_CHIPID) || (ds18x20_addr[num_sensors][0]==DS18B20_CHIPID) || (ds18x20_addr[num_sensors][0]==MAX31850_CHIPID))) {
num_sensors++;
}
}
for (int i = 0; i < num_sensors; i++) {
ds18x20_idx[i] = i;
}
for (int i = 0; i < num_sensors; i++) {
for (int j = i + 1; j < num_sensors; j++) {
if (uint32_t(ds18x20_addr[ds18x20_idx[i]]) > uint32_t(ds18x20_addr[ds18x20_idx[j]])) {
std::swap(ds18x20_idx[i], ds18x20_idx[j]);
}
}
}
ds18x20_snsrs = num_sensors;
}
uint8_t ds18x20_sensors()
{
return ds18x20_snsrs;
}
String ds18x20_address(uint8_t sensor)
{
char addrStr[20];
uint8_t i;
for (i = 0; i < 8; i++) {
sprintf(addrStr+2*i, "%02X", ds18x20_addr[ds18x20_idx[sensor]][i]);
}
return String(addrStr);
}
void ds18x20_convert()
{
ds->reset();
ds->write(W1_SKIP_ROM); // Address all Sensors on Bus
ds->write(W1_CONVERT_TEMP); // start conversion, no parasite power on at the end
// delay(750); // 750ms should be enough for 12bit conv
}
boolean ds18x20_read(uint8_t sensor, float &t)
{
byte data[12];
int8_t sign = 1;
uint8_t i = 0;
float temp9 = 0.0;
uint8_t present = 0;
t = NAN;
ds->reset();
ds->select(ds18x20_addr[ds18x20_idx[sensor]]);
ds->write(W1_READ_SCRATCHPAD); // Read Scratchpad
for (i = 0; i < 9; i++) {
data[i] = ds->read();
}
if (OneWire::crc8(data, 8) == data[8]) {
switch(ds18x20_addr[ds18x20_idx[sensor]][0]) {
case DS18S20_CHIPID: // DS18S20
/*
// App_note AN162.pdf page 9
int temp_lsb, temp_msb;
temp_msb = data[1]; // Sign byte + lsbit
temp_lsb = data[0]; // Temp data plus lsb
if (temp_msb <= 0x80) temp_lsb = (temp_lsb/2); // Shift to get whole degree
temp_msb = temp_msb & 0x80; // Mask all but the sign bit
if (temp_msb >= 0x80) { // Negative temperature
temp_lsb = (~temp_lsb)+1; // Twos complement
temp_lsb = (temp_lsb/2); // Shift to get whole degree
temp_lsb = ((-1)*temp_lsb); // Add sign bit
}
t = (int)temp_lsb; // Temperature in whole degree
*/
if (data[1] > 0x80) {
data[0] = (~data[0]) +1;
sign = -1; // App-Note fix possible sign error
}
if (data[0] & 1) {
temp9 = ((data[0] >> 1) + 0.5) * sign;
} else {
temp9 = (data[0] >> 1) * sign;
}
t = convertTemp((temp9 - 0.25) + ((16.0 - data[6]) / 16.0));
break;
case DS18B20_CHIPID: // DS18B20
case MAX31850_CHIPID: // MAX31850
uint16_t temp12 = (data[1] << 8) + data[0];
if (temp12 > 2047) {
temp12 = (~temp12) +1;
sign = -1;
}
t = convertTemp(sign * temp12 * 0.0625);
break;
}
}
return (!isnan(t));
}
/*********************************************************************************************\
* Presentation
\*********************************************************************************************/
void ds18x20_type(uint8_t sensor)
{
strcpy_P(dsbstype, PSTR("DS18x20"));
switch(ds18x20_addr[ds18x20_idx[sensor]][0]) {
case DS18S20_CHIPID:
strcpy_P(dsbstype, PSTR("DS18S20"));
break;
case DS18B20_CHIPID:
strcpy_P(dsbstype, PSTR("DS18B20"));
break;
case MAX31850_CHIPID:
strcpy_P(dsbstype, PSTR("MAX31850"));
break;
}
}
void ds18x20_mqttPresent(uint8_t* djson)
{
char stemp1[10];
char stemp2[10];
float t;
byte dsxflg = 0;
for (byte i = 0; i < ds18x20_sensors(); i++) {
if (ds18x20_read(i, t)) { // Check if read failed
ds18x20_type(i);
dtostrfd(t, sysCfg.flag.temperature_resolution, stemp2);
if (!dsxflg) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s, \"DS18x20\":{"), mqtt_data);
*djson = 1;
stemp1[0] = '\0';
}
dsxflg++;
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s%s\"DS%d\":{\"" D_TYPE "\":\"%s\", \"" D_ADDRESS "\":\"%s\", \"" D_TEMPERATURE "\":%s}"),
mqtt_data, stemp1, i +1, dsbstype, ds18x20_address(i).c_str(), stemp2);
strcpy(stemp1, ", ");
#ifdef USE_DOMOTICZ
if (1 == dsxflg) {
domoticz_sensor(0, stemp2);
}
#endif // USE_DOMOTICZ
}
}
if (dsxflg) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s}"), mqtt_data);
}
}
#ifdef USE_WEBSERVER
String ds18x20_webPresent()
{
String page = "";
char stemp[10];
char stemp2[16];
char sensor[80];
float t;
for (byte i = 0; i < ds18x20_sensors(); i++) {
if (ds18x20_read(i, t)) { // Check if read failed
ds18x20_type(i);
dtostrfi(t, sysCfg.flag.temperature_resolution, stemp);
snprintf_P(stemp2, sizeof(stemp2), PSTR("%s-%d"), dsbstype, i +1);
snprintf_P(sensor, sizeof(sensor), HTTP_SNS_TEMP, stemp2, stemp, tempUnit());
page += sensor;
}
}
ds18x20_search(); // Check for changes in sensors number
ds18x20_convert(); // Start Conversion, takes up to one second
return page;
}
#endif // USE_WEBSERVER
#endif // USE_DS18x20