Dallas' DS1820 family temperature sensor. For more details see [https://developer.mbed.org/users/hudakz/code/DS1820/wiki/Homepage]
Dependents: BLE_nRF24L01 frdm_serialfgmp gather_sensor_data UltiSaverController ... more
Some programs using the DS1820 library:
Import programDS1820_Hello
Simple DS1820 sensor demo showing how to use the DS1820 library [https://developer.mbed.org/users/hudakz/code/DS1820/]
Import programBLE_nRF24L01
Bluetooth Low Energy (BLE) beacon with nRF24L01(+). Data is received and displayed by Android device (Android app source code is attached).
Examples of use:
Single DS1820 sensor
/* * Single DS1820 sensor GPIO driven * * Note: Don't forget to connect a 4.7k Ohm resistor * between the DS1820's data pin and the +3.3V pin * * ---------------- * | | -----------------------> +3.3V * | MBED BOARD | | * | | | ------ * | +3.3V |--o--| 4.7k |------- * | | ------ | * | | | * | | | * | | | * | | | * | GPIO |--------------------o-----> 1-wire bus/line * | | * | | * | GND |--------------------------> GND * | | * ---------------- * */ #include "mbed.h" #include "DS1820.h" Serial serial(USBTX, USBRX); int main() { DS1820 ds1820(D8); // substitute D8 with actual mbed pin name connected to the DS1820 data pin if(ds1820.begin()) { while(1) { ds1820.startConversion(); // start temperature conversion ThisThread::sleep_for(1000); // let DS1820 complete the temperature conversion serial.printf("temp = %3.1f\r\n", ds1820.read()); // read temperature } } else serial.printf("No DS1820 sensor found!\r\n"); }
Single DS1820 sensor. Data integrity is assured by performing CRC.
/* * Single DS1820 sensor GPIO driven + performing CRC * * Note: Don't forget to connect a 4.7k Ohm resistor * between the DS1820's data pin and the +3.3V pin * * ---------------- * | | -----------------------> +3.3V * | MBED BOARD | | * | | | ------ * | +3.3V |--o--| 4.7k |------- * | | ------ | * | | | * | | | * | | | * | | | * | GPIO |--------------------o-----> 1-wire bus/line * | | * | | * | GND |--------------------------> GND * | | * ---------------- * */ #include "mbed.h" #include "DS1820.h" Serial serial(USBTX, USBRX); int main() { DS1820 ds1820(D8); // substitute D8 with actual mbed pin name connected to the DS1820 data pin float temp = 0; int error = 0; if(ds1820.begin()) { while(1) { ds1820.startConversion(); // start temperature conversion ThisThread::sleep_for(1000); // let DS1820 complete the temperature conversion error = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC) switch(error) { case 0: // no errors -> 'temp' contains the value of measured temperature serial.printf("temp = %3.1f\r\n", temp); break; case 1: // no sensor present -> 'temp' is not updated serial.printf("no sensor present\n\r"); break; case 2: // CRC error -> 'temp' is not updated serial.printf("CRC error\r\n"); } } } else serial.printf("No DS1820 sensor found!\r\n"); }
Several DS1820 sensors connected to the same 1-wire bus.
/* * Multiple sensors GPIO driven * * Note: Don't forget to connect a 4.7k Ohm resistor * between the 1-wire bus data line and the +3.3V rail * * ---------------- * | | -----------------------> +3.3V * | MBED BOARD | | * | | | ------ * | +3.3V |--o--| 4.7k |------- * | | ------ | * | | | * | | | * | | | * | | | * | GPIO |--------------------o-----> 1-wire bus/line * | | * | | * | GND |--------------------------> GND * | | * ---------------- * */ #include "mbed.h" #include "DS1820.h" #define MAX_SENSOSRS 32 // max number of DS1820 sensors to be connected to the 1-wire bus (max 256) DS1820* ds1820[MAX_SENSOSRS]; Serial pc(USBTX, USBRX); DigitalOut led(LED1); OneWire oneWire(D8); // substitute D8 with the actual pin name connected to the 1-wire bus int sensorsFound = 0; // counts the actually found DS1820 sensors int main() { pc.printf("\r\n--Starting--\r\n"); //Enumerate (i.e. detect) DS1820 sensors on the 1-wire bus for (sensorsFound = 0; sensorsFound < MAX_SENSOSRS; sensorsFound++) { ds1820[sensorsFound] = new DS1820(&oneWire); if (!ds1820[sensorsFound]->begin()) { delete ds1820[sensorsFound]; break; } } switch (sensorsFound) { case 0: pc.printf("No DS1820 sensor found!\r\n"); return -1; case 1: pc.printf("One DS1820 sensor found.\r\n"); break; default: pc.printf("Found %d DS1820 sensors.\r\n", sensorsFound); } while (1) { pc.printf("----------------\r\n"); for (int i = 0; i < sensorsFound; i++) ds1820[i]->startConversion(); // start temperature conversion from analog to digital ThisThread::sleep_for(1000); // let DS1820 sensors complete the temperature conversion for (int i = 0; i < sensorsFound; i++) { if (ds1820[i]->isPresent()) pc.printf("temp[%d] = %3.1f%cC\r\n", i, ds1820[i]->read(), 176); // read temperature } } }
Several DS1820 sensors connected to the same 1-wire bus. UART is used to implement the bus
/* * Multiple sensors UART driven: * * UART is driving the 1-Wire Bus Master according to Maxim Integrated application note * * https://www.maximintegrated.com/en/design/technical-documents/tutorials/2/214.html * * In addition to the 4.7k Ohm resistor between the 1-wire data bus/line and the +3.3V pin, * a 470 Ohm resistor shall be tied to the UART's tx and rx pin. UART's rx pin is then used * as 1-wire data bus/line. * * ---------------- * | | -----------------------> +3.3V * | MBED BOARD | | * | | | ------ * | +3.3V |--o--| 4.7k |------- * | | ------ | * | | ------ | * | UART TX |-----| 470 |--- | * | | ------ | | * | | | | * | UART RX |----------------o---o-----> 1-wire bus/line * | | * | | * | GND |--------------------------> GND * | | * ---------------- * */ #include "mbed.h" #include "DS1820.h" #define MAX_SENSOSRS 32 // max number of DS1820 sensors to be connected to the 1-wire bus (max 256) DS1820* ds1820[MAX_SENSOSRS]; DigitalOut led(LED1); OneWire oneWire(p9, p10); // LPC1768 (UART Tx pin, UART Rx pin) //OneWire oneWire(PA_0, PA_1); // NUCLE0-F446RE (UART Tx pin, UART Rx pin) int sensorsFound = 0; // counts the actually found DS1820 sensors /** * @brief * @note * @param * @retval */ int main() { printf("\r\n--Starting--\r\n"); //Enumerate (i.e. detect) DS1820 sensors on the 1-wire bus for (sensorsFound = 0; sensorsFound < MAX_SENSOSRS; sensorsFound++) { ds1820[sensorsFound] = new DS1820(&oneWire); if (!ds1820[sensorsFound]->begin()) { delete ds1820[sensorsFound]; break; } } switch (sensorsFound) { case 0: printf("No DS1820 sensor found!\r\n"); return -1; case 1: printf("One DS1820 sensor found.\r\n"); break; default: printf("Found %d DS1820 sensors.\r\n", sensorsFound); } while (1) { led = !led; printf("----------------\r\n"); for (int i = 0; i < sensorsFound; i++) ds1820[i]->startConversion(); // start temperature conversion from analog to digital #if (MBED_MAJOR_VERSION > 5) ThisThread::sleep_for(1s); #else wait(1); #endif for (int i = 0; i < sensorsFound; i++) { if (ds1820[i]->isPresent()) printf("temp[%d] = %3.1f%cC\r\n", i, ds1820[i]->read(), 176); // read temperature } } }
Diff: DS1820.cpp
- Revision:
- 17:9ff584b9809f
- Parent:
- 14:b02fa18b294a
- Child:
- 20:98c261bcb399
--- a/DS1820.cpp Mon Jan 21 11:38:42 2019 +0000 +++ b/DS1820.cpp Sat Jan 26 21:22:07 2019 +0000 @@ -16,12 +16,12 @@ * ds1820.startConversion(); * wait(1.0); * while(1) { - * serial.printf("temp = %3.1f\r\n", ds1820.read()); // read temperature + * printf("temp = %3.1f\r\n", ds1820.read()); // read temperature * ds1820.startConversion(); // start temperature conversion * wait(1.0); // let DS1820 complete the temperature conversion * } * } else - * serial.printf("No DS1820 sensor found!\r\n"); + * printf("No DS1820 sensor found!\r\n"); * } * * @@ -32,11 +32,7 @@ #include "DS1820.h" -#define DEBUG 0 - -#if DEBUG -extern Serial serial; -#endif +//#define DEBUG 1 /** * @brief Constructs a generic DS1820 sensor @@ -83,7 +79,7 @@ wait_ms(250); if(!oneWire.search(addr)) { #if DEBUG - serial.printf("No addresses.\r\n"); + printf("No addresses.\r\n"); #endif oneWire.reset_search(); wait_ms(250); @@ -91,11 +87,11 @@ } #if DEBUG - serial.printf("ROM ="); + printf("ROM ="); for(uint8_t i = 0; i < 8; i++) { - serial.printf(" %x", addr[i]); + printf(" %x", addr[i]); } - serial.printf("\r\n"); + printf("\r\n"); #endif if(OneWire::crc8(addr, 7) == addr[7]) { @@ -106,28 +102,28 @@ case 0x10: model_s = true; #if DEBUG - serial.printf("DS18S20 or old DS1820\r\n"); + printf("DS18S20 or old DS1820\r\n"); #endif break; case 0x28: model_s = false; #if DEBUG - serial.printf("DS18B20\r\n"); + printf("DS18B20\r\n"); #endif break; case 0x22: model_s = false; #if DEBUG - serial.printf("DS1822\r\n"); + printf("DS1822\r\n"); #endif break; default: present = false; #if DEBUG - serial.printf("Device doesn't belong to the DS1820 family\r\n"); + printf("Device doesn't belong to the DS1820 family\r\n"); #endif return false; } @@ -135,7 +131,7 @@ } else { #if DEBUG - serial.printf("Invalid CRC!\r\n"); + printf("Invalid CRC!\r\n"); #endif return false; } @@ -174,16 +170,16 @@ oneWire.reset(); oneWire.skip(); - oneWire.write(0xBE); // to read Scratchpad + oneWire.write_byte(0xBE); // to read Scratchpad for(uint8_t i = 0; i < 9; i++) // read Scratchpad bytes - data[i] = oneWire.read(); + data[i] = oneWire.read_byte(); data[4] |= (res - 9) << 5; // update configuration byte (set resolution) oneWire.reset(); oneWire.skip(); - oneWire.write(0x4E); // to write into Scratchpad + oneWire.write_byte(0x4E); // to write into Scratchpad for(uint8_t i = 2; i < 5; i++) // write three bytes (2nd, 3rd, 4th) into Scratchpad - oneWire.write(data[i]); + oneWire.write_byte(data[i]); } /** @@ -200,7 +196,7 @@ if(present) { oneWire.reset(); oneWire.skip(); - oneWire.write(0x44); //start temperature conversion + oneWire.write_byte(0x44); //start temperature conversion } } @@ -214,15 +210,15 @@ if(present) { oneWire.reset(); oneWire.skip(); - oneWire.write(0xBE); // to read Scratchpad - for(uint8_t i = 0; i < 9; i++) // read Scratchpad bytes - data[i] = oneWire.read(); + oneWire.write_byte(0xBE); // to read Scratchpad + for(uint8_t i = 0; i < 9; i++) // reading scratchpad registers + data[i] = oneWire.read_byte(); // Convert the raw bytes to a 16-bit unsigned value uint16_t* p_word = reinterpret_cast < uint16_t * > (&data[0]); #if DEBUG - serial.printf("raw = %#x\r\n", *p_word); + printf("raw = %#x\r\n", *p_word); #endif if(model_s) { @@ -276,18 +272,24 @@ if(present) { oneWire.reset(); oneWire.skip(); - oneWire.write(0xBE); // to read Scratchpad - for(uint8_t i = 0; i < 9; i++) // reading scratchpad registers - data[i] = oneWire.read(); + oneWire.write_byte(0xBE); // to read Scratchpad + for(uint8_t i = 0; i < 9; i++) // reading scratchpad registers + data[i] = oneWire.read_byte(); if(oneWire.crc8(data, 8) != data[8]) // if calculated CRC does not match the stored one + { +#if DEBUG + for(uint8_t i = 0; i < 9; i++) + printf("data[%d]=0x%.2x\r\n", i, data[i]); +#endif return 2; // return with CRC error + } // Convert the raw bytes to a 16bit unsigned value uint16_t* p_word = reinterpret_cast < uint16_t * > (&data[0]); #if DEBUG - serial.printf("raw = %#x\r\n", *p_word); + printf("raw = %#x\r\n", *p_word); #endif if(model_s) { @@ -348,4 +350,3 @@ return (float(word) / 256.0f); } -