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clarification on my video and radio question
I want to make a complex robot. To keep it simple right now I just want the I have used a LM140 temperature sensor, whose output in 10 mV per degree Kelvin. ?I ran the output to a 10 bit A/D converter input on a PIC microcontroller. ?After scaling the data I then output it from the PIC to a PC via an RS-232 driver chip, a MAX232. ?This allows me to display temperature in Celsius on a PC. ?Similar temperature sensors are avilable whose outputs are scaled to degrees C or F. |
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I want to make a complex robot. To keep it simple right now I just want the
robot to send video, temperature, and altitude. Maybe even some other things later on. I was thinking I can go digital or analog. When would you use digital or analog? I would think that analog would be easier because all the sensors and video would be in analog. But yet isn't it true that digital would be much simpler for manipulating the many signals? The easy part is getting the sensors and video to work, and then sending their signals to another device. Doesn't a multiplexor combine signals? Is there anything else that combines signals that I might want to use? What I will send to the robot will be control signals for servo's and such. I know I'm going to need to do studying to learn what I want to do. I just finished reading two very basic electronics books. The books were Getting Started in Electronics and Basic Electronics. Both are Radio Shack books. What should I read now to help me reach the goal that I currently want to achieve? Lots of Thanks, Jon First of all keep in mind I'm a beginner. I would appreciate the groups help in directing me for my project. This is something I have always wanted to learn how to do. I think I want to make a carreer out of it. From point A, I want to be able to take a video signal and other signals, combine them into one, then send them out via radio. Then from point B receive them, decode the signal, and use the video and other signals, for whatever purposes I need. I also need to be able, from point B, to combine other signals minus video this time, and send them via radio to point A, and at point A decode those signals and use them. I can see many steps and components involved in getting this to work, and would highly appreciate the groups help. Thanks, Jon |
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Himanshu Sharma
hey ,
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try and read RS485...that will help you have digital signal speed of about 2Mbps... and believe me Digital is easy and better when it comes to working with signals and you can control them easily...(synchronous and asynchronous...) Regards :-), --himanshu sharma ----- Original Message -----
From: <epsulon@...> To: <Electronics_101@...> Sent: Friday, November 02, 2001 12:07 AM Subject: [Electronics_101] clarification on my video and radio question : I want to make a complex robot. To keep it simple right now I just want the : robot to send video, temperature, and altitude. Maybe even some other things : later on. I was thinking I can go digital or analog. When would you use : digital or analog? I would think that analog would be easier because all the : sensors and video would be in analog. But yet isn't it true that digital : would be much simpler for manipulating the many signals? The easy part is : getting the sensors and video to work, and then sending their signals to : another device. Doesn't a multiplexor combine signals? Is there anything : else that combines signals that I might want to use? What I will send to the : robot will be control signals for servo's and such. : : I know I'm going to need to do studying to learn what I want to do. I just : finished reading two very basic electronics books. The books were Getting : Started in Electronics and Basic Electronics. Both are Radio Shack books. : What should I read now to help me reach the goal that I currently want to : achieve? : Lots of Thanks, : Jon : : : : : : : : : : : First of all keep in mind I'm a beginner. I would appreciate the groups help : in directing me for my project. This is something I have always wanted to : learn how to do. I think I want to make a carreer out of it. : : >From point A, I want to be able to take a video signal and other signals, : combine them into one, then send them out via radio. Then from point B : receive them, decode the signal, and use the video and other signals, for : whatever purposes I need. I also need to be able, from point B, to combine : other signals minus video this time, and send them via radio to point A, and : at point A decode those signals and use them. : : I can see many steps and components involved in getting this to work, and : would highly appreciate the groups help. : Thanks, : Jon : : |
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I was thinking I can go digital or analog. When would you use
digital or analog?Hi! Going Digital or analog depends on many factors such as the nature of the information you want to transmit, the channel?s proprieties, etc. Transmitting digital video at a beggining stage is not, to my understanding a good ideia because it implies codification, in order to reduce redundancy. I would say that a good start is to buy a simple analog TV transmitter. They cost around 10 Euros here in Portugal. That would be roughly 8 USD. They offer reasonable Picture quality and have a typical range of 30 meters. Now, as you know, the TV channel is composed of video and audio subchannels. What you can do very easily is to feed the video subchannel with your picture coming from a camera, and impose the aditional information on the audio subchannel. This very widely used technique in telephone systems is called "in band modulation". The audio subchannel is sufficiently large for you to make it carry sound as well as information from your sensors. The information from the sensors can modulate a low frequency oscillator, that feeds the transmitters audio input. Other techniques are possible. This really depends on the nature of the sensors. the hardest part is the reception. You would have to extract the sensor information from the recieved audio band. So, you can use a comon TV set and intercept the audio signal (say from the headphone or scart output) and decode it. Once temperature, altitude, humidity don?t really change very fast (unless you have free fall...) the sollution I propose is easy to achieve! Best of luck! Mehdi. |
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hai jon,
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first read ADC book . that will give u a clear picture of analog and digital converters.choose ADC of highere resoluton and conversion time best is AD576 which had 36 micro second conversion time. there are lot of muliplexer ICs are there in market. ex:4051 which combine 8 analog signals. best book to read is digital elctronics by simon haykins. ----- Original Message -----question just want theother thingsyou use : digital or analog? I would think that analog would be easierbecause all thedigital : would be much simpler for manipulating the many signals? The easypart is : getting the sensors and video to work, and then sending theirsignals to : another device. Doesn't a multiplexor combine signals? Is thereanything : else that combines signals that I might want to use? What I willsend to thedo. I just : finished reading two very basic electronics books. The books wereGetting : Started in Electronics and Basic Electronics. Both are RadioShack books. : What should I read now to help me reach the goal that I currentlywant to : achieve?Thanks, :Jon :groups helpwanted to : learn how to do. I think I want to make a carreer out of it.signals, : combine them into one, then send them out via radio. Then frompoint B : receive them, decode the signal, and use the video and othersignals, for : whatever purposes I need. I also need to be able, from point B,to combine : other signals minus video this time, and send them via radio topoint A, andwork, and : would highly appreciate the groups help.Jon : |
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