http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. Mon, 01 Dec 2008 12:32:41 -0800 http://backend.userland.com/rss092 hi,i have a project of a temperature sensor network. the concept is a temperature sensor sense the water temperature and transmit the temperature valu <noauthor@nospam.com> http://www.8051projects.net/forum-t9872.html What sensor have you decided for water temp?You would need to interface the sensor to an ADC first.Look here for a tut on 8051 interfacing to an adc. sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t9872.html thanks sashijoseph.i am using temperature sensor DS18S20 for this project. But i have problem for the connection. the pin no.2 (DQ) of the DS18S20 nee mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html DS18S20 is digital thermo meter so no need of aany ADC. for what you are using ADC?? abbas1707<abbas@nospam.com> http://www.8051projects.net/forum-t9872.html so means that direct connect the pin 2 (DQ) to microcontroller 8051 should be ok? but connected to which pin at 8051? Is that pin no.17? Coz i found t mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html you can connect it to any pin of 8051 which is an i/o pin. then 1 wire protocol will be used for communication b/w sensor and controller. you can conn abbas1707<abbas@nospam.com> http://www.8051projects.net/forum-t9872.html What you mean pullup in this case? Is that connected multiples ds18s20 with external power supply instead of parasite power? Is it possible to connect mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html pullup resistor. it is possible to connect different ds18s20 to different i/o pins but it will...be totally a bad design.you have to follow the standa abbas1707<abbas@nospam.com> http://www.8051projects.net/forum-t9872.html erm...can you give me an example of circuit diagram on how to connect in pullup resistor? If using parasite power for DS18S20, the Vdd pin is connecte mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html Pullup is something like this...VCC |----/\/\/\/\---->Pinvdd can be connected to ground if you are using parasitic mode of power b Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html so means that if only 1 DS18S20 is used, then no need add on pullup, rite? direct connect the DQ pin to the i/o pin the circuit will work already, rit mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html is my connection for multiple DS18S20 is correct? i have attach a circuit diagram at below. pls check it out. mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html yes they are right.. no need of that jumper, its understandable that wires are passing over each other but not connected but if you still want to kee Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html i'm using express SCH inside express PCB software. But i can't convert the schematic diagram drawing to PCB. anyone can help me on this? bside, as you mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html you dont have to worry about the arrangement, when you design PCB, the footprints are always in arranged order. All you need to do is select the right Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html oh i see. is that at expressPCB i need to draw again the circuit? is that this software doesn't hv any function like automatic convert the schematic d mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html following is my project full circuit diagram. now i having problem on the microcontroller 8051 assembly language. how to wrote the coding so that the mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html search in website for VB Serial communication or MSCOMM you will get all your answers.. Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html erm...i mean is the coding (assembly language) for 8051 microcontroller not coding for visual basic. mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html use simple serial communication to send data to UART.see tutorial for more help.. Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html erm...i mean is the coding (assembly language) for 8051 microcontroller not coding for visual basic. The asm coding is for the micro to send data to t sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t9872.html from the UART tutorial, i found two note: 8051 programming to UART and software UART for 8051. Is that coding in both note are need for my circuit? Or mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html 8051 UART programming is the one you need,not the software uart.The software uart is for emulating a hardware uart in situations where the hardware ua sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t9872.html have you compiled it and tested it on hardware yourself?If not please do it only then we will be able to find out what the problem is and it will be e Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html sensor.zipfollowing is the coding i modify from the DS1820 Based Temperature Controller (AT89C2051) at download section. can anyone help me check my c mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html there is no modifications needed. intel 8051 and atmel 89C51 both have same features. So you can directly program the hex file. No worries! Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html i am on the way of purchasing the hardware component. however, i found that at my county hard to purchase intel 8051 microcontroller. if i replace the mic_k86<mic_k86@nospam.com> http://www.8051projects.net/forum-t9872.html there is no modifications needed. intel 8051 and atmel 89C51 both have same features. So you can directly program the hex file. No worries! Ajay<contact@nospam.com> http://www.8051projects.net/forum-t9872.html