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Getting these cloned, cheap UTC to work in Windows is a bit tricky. Refer my video section here for exact wire connections and pin information. Hardware connections: As shown in the attached figureġ) Since DS is a 1-wire device/sensor that can be powered in Parasite mode, I have shorted the Receive ( RXD) and Transmit ( TXD) pins of UTC and connected it to data or DQ (Yellow wire/pin 2) of DS.Ģ) The ground GND (Black wire/pin 1) and Power VDD (Red wire/pin 3) are shorted together and connected to ground GND of UTC. using only two wires for connections (Ground and Data). But we will use DS in Parasite power mode i.e. Bare IC form shown in attached image, the pin out is - Left-Gnd, Middle-DQ or Data, Right-VCC (I have coded those lines as Black, Yellow, Red respectively to match the wire coding of encapsulated form) **In general the black wire is ground line, red is +ve VCC (+3.0 to +5.5V) and Yellow line is the DQ or data line. The one I have used is with steel encapsulation ordered from (links given on my blog ) It comes as IC or on ebay,aliexpress etc we can find very cheap encapsulated versions. Note:- In subsequent steps I am using following abbreviations for personal ease-ĭS = DS18B20 1-wire temperature sensor with programmable resolutionīill of Materials (Links for specific source of each component is given on my blog here )Ģ) USB to RS232 TTL converter with Prolific PL2303HX ICģ) Few Male-Female SIL Socket Row Strip PCB Connector, can be skipped if you want to solder DS directly to UTCĤ) 2 Wires (optional), soldering equipment and other accessories.ĭS comes in different forms, packages. This DS18B20 temp sensor is available at around 2USD and cloned USB to RS232-TTL (i used one with Prolific PL2303HX) converter for around 2-3 USD on ebay,amazon or aliexpress. WITHOUT using any additional electronic component. After scratching my head and with help of great GOOGLE i finally manged to make it work with very simple connections. I had a cheap USB to RS232-TTL converter lying in my drawer, and I decided to use it to communicate with DS18B20. But again, it demands Expensive proprietary USB to RS232 adapters.
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To make it easier, Maxim Integrated has made freely available OneWireViewer software for different PC operating systems. That makes life of a Common electronics enthusiast difficult. It is typically used to communicate with small inexpensive devices such as digital thermometers and weather instruments." read more here and here.īut Interfacing 1-wire devices require complex programming for bus timing adjustments.
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1-Wire is similar in concept to I☬, but with lower data rates and longer range. that provides low-speed data, signaling, and power over a single signal. Wikipedia says " 1-Wire is a device communications bus system designed by Dallas Semiconductor Corp. can run only using ground and 1 additional wire ( two wires in total).
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A fairly reasonable temperature range for day to day applications and weather system. The best thing is we do not need any microcontroller, microprocessor, Arduino or Raspberry PI etc.
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And with the help of free software "OneWireViewer" from Maxim Integrated we can program resolution, view temperature readings or save the data in text or excel files. Here, I managed (with the help of several google searches )) to interface the DS18B20 with my laptop using cheaply available USB to RS232 converter. In this instructable I will go a step BACK, interfacing a digital temperature sensor DS18B20 and getting the realtime temperature readings in degrees and Fahrenheit on windows PC WITHOUT any programming :). but still want to have a handy digital thermometer.
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That required knowledge of programming, basic electronics and required a bit of electronics hardware too.īut what about those who HATE programming and Electronics. In my previous instructable I gave an introduction to Digital thermometer using DS18B20 and ESP8266 nodemcu board with SPI OLED display, and programming using Arduino IDE.
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