DS18B20 Digital Thermometer Brick, AU $3.50 – Picture 0

DS18B20 Digital Thermometer Brick, AU $3.50 – Picture 1

DS18B20 Digital Thermometer Brick, AU $3.50 – Picture 2

Ds18b20 Digital Thermometer Brick

AU $3.50

Sydney, Australia
Jun 9th

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Overview DS18B20 digital temperature sensor is ultra-small, has wide range of applicable voltage and measurable temperature and high resolution. It can be applied to temperature control, industrial systems, consumer products, thermometers or any thermal measurement system. DESCRIPTION What is an electronic brick? An electronic brick is an electronic module which can be assembled like Lego bricks simply by plugging in and pulling out. Compared to traditional universal boards and circuit modules assembled with various electronic components, electronic brick has standardized interfaces, plug and play, simplifying construction of prototype circuit on one’s own. There are many types of electronic bricks, and we provide more than twenty types with different functions including buttons, sensors, Bluetooth modules, etc, whose functions cover from sensor to motor drive, from Ethernet to wireless communication via Bluetooth, and so on. We will continue to add more types to meet the various needs of different projects. DS18B20 is a single-bus digital temperature sensor with features of ultra-small size, wide range of applicable voltage and measurable temperature and high resolution, etc. , which can be applied to temperature control, industrial systems, consumer products, thermometers or any thermal measurement system. Features 1. Plug and play, easy to use. Compatible with the mainstream 2.54 interfaces and 4-Pin Grove interfaces in the market. 2. With use of M4 standard fixed holes, compatible with M4-standard kits such as Lego and Makeblock. 3. Rotatable detecting direction for better adaption. Specifications PCB size 33.2mm X 14.0mm X 1.6mm Working voltage 3.3 or 5V DC Operating voltage 3.3 or 5V DC Measurable range -55~+125C Measurement resolution 9~12bits (programmable) Compatible interfaces 2.54 3-pin interface and 4-pin Grove interface(1) Note 1: S for digital input/output port, V and G for voltage at the common collector and ground respectively DC electrical characteristics Parameter Min. Typical Max. Unit Working voltage 3 5 5.5 VDC Working current (VCC=5Vï¼ŒT=25C) - 1 1.5 mA Sampling interval 1 - - s Accuracy -10~+85C - - ±0.5 C -55~+125C - - ±2 C Logic input low level VIL -0.3 - +0.8 V Logic input high level VIH 2.2 - 5.5/VCC+0.3 V AC electrical characteristics Parameter Min. Typical Max. Unit Temperature conversion time tCONV 9-bit accuracy - - 93.75 ms 10-bit accuracy - - 187.5 ms 11-bit accuracy - - 375 ms 12-bit accuracy - - 750 ms Time for strong pullup on tSPON - - 10 us Time slot tSLOT 60 - 120 us Recovery time tREC 1 - - us Write 0 low time tLOW0 60 - 120 us Write 1 low time tLOW1 1 - 15 us Read data valid tRDV - - 15 us Reset time high tRSTH 480 - - us Reset time low tRSTL 480 - - us Presence-detect high tPDHIGH 15 - 60 us Presence-detect low tPDLOW 60 - 240 us Capacitance CIN/OUT - - 25 pF Instruction Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. The figure below shows a block diagram of DS18B20. The scratchpad memory contains the 2-byte temperature register that stores the datal output from the temperature sensor. In addition, the scratchpad provides access to direct temperature alarm trigger registers (TH and TL) and the 1-byte configuration register. The configuration register allows the user to set the resolution of the temperature-to-digital conversion to 9, 10, 11, or 12 bits. The TH, TL, and configuration registers are nonvolatile (EEPROM), so they will retain data when the device is powered down. DEMO Connect S port of DS18B20 electronic brick to D0 port of Arduino board, and we will use the following program to read register information and temperature value. #include // OneWire DS18S20, DS18B20, DS1822 Temperature Example // http://www.pjrc.com/teensy/td_libs_OneWire.html // The DallasTemperature library can do all this work for you! // http://milesburton.com/Dallas_Temperature_Control_Library OneWire ds(10); // on pin 10 void setup(void) { Serial.begin(9600); } void loop(void) { byte i; byte present = 0; byte type_s; byte data[12]; byte addr[8]; float celsius, fahrenheit; if ( !ds.search(addr)) { Serial.println("No more addresses."); Serial.println(); ds.reset_search(); delay(250); return; } Serial.print("ROM ="); for( i = 0; i < 8; i++) { Serial.write(' '); Serial.print(addr[i], HEX); } if (OneWire::crc8(addr, 7) != addr[7]) { Serial.println("CRC is not valid!"); return; } Serial.println(); // the first ROM byte indicates which chip switch (addr[0]) { case 0x10: Serial.println(" Chip = DS18S20"); // or old DS1820 type_s = 1; break; case 0x28: Serial.println(" Chip = DS18B20"); type_s = 0; break; case 0x22: Serial.println(" Chip = DS1822"); type_s = 0; break; default: Serial.println("Device is not a DS18x20 family device."); return; } ds.reset(); ds.select(addr); ds.write(0x44,1); // start conversion, with parasite power on at the end delay(1000); // maybe 750ms is enough, maybe not // we might do a ds.depower() here, but the reset will take care of it. present = ds.reset(); ds.select(addr); ds.write(0xBE); // Read Scratchpad Serial.print(" Data = "); Serial.print(present,HEX); Serial.print(" "); for ( i = 0; i < 9; i++) { // we need 9 bytes data[i] = ds.read(); Serial.print(data[i], HEX); Serial.print(" "); } Serial.print(" CRC="); Serial.print(OneWire::crc8(data, 8), HEX); Serial.println(); // convert the data to actual temperature unsigned int raw = (data[1] << 8) | data[0]; if (type_s) { raw = raw << 3; // 9 bit resolution default if (data[7] == 0x10) { // count remain gives full 12 bit resolution raw = (raw & 0xFFF0) + 12 - data[6]; } } else { byte cfg = (data[4] & 0x60); if (cfg == 0x00) raw = raw << 3; // 9 bit resolution, 93.75 ms else if (cfg == 0x20) raw = raw << 2; // 10 bit res, 187.5 ms else if (cfg == 0x40) raw = raw << 1; // 11 bit res, 375 ms // default is 12 bit resolution, 750 ms conversion time } celsius = (float)raw / 16.0; fahrenheit = celsius * 1.8 + 32.0; Serial.print(" Temperature = "); Serial.print(celsius); Serial.print(" Celsius, "); Serial.print(fahrenheit); Serial.println(" Fahrenheit"); } Revision record Version Description Date Written by v1.0 Initial edition 26th, April, 2013 Stan Lee Specification Brick Type Sensor Brick Brick Interface 3PIN Brick Power Supply 5V Board Size 33.2 Ã— 14 Ã— 1.6mm LED Color No Weight 15.00g Model IM120710012 Download Schematic SCH_IM120710012 Datasheet DS_IM120710012 Demo Code DEMO_IM120710012