select embedded microcontroller

[shaneelal]

selecting microcontroller speed

hi,I'm working on a welding monitoring project.I need with one aspect of the design. Part of the project is to superimpose video characters onto a video display.The characters are wirespeed,voltage and current.
I have so many questions I don't know if this is the write place. I will ask those that I think are relevant here. This aspect of the project has 2 sensors,current and voltage are feed to an analogue mulitplixer then an ADC then 8bits to controller. Another device which senses speed sendings this speed along a serial to this microcontroller.Also I need 1 line from microcontroller to select I or V sensor using multiplexer. I also need to sense polarity of voltage sensor,I'm not sure how I'm going to do that,but I assume I need 2 connections to microcontroller. I'm also using a Bob-3 for my video module which will use a serial line from controller,use that data and superimpose it onto a screen,I serial line from microcontroller will transmit data to Bob-3.Also that microcontroller has to output to a HD44780, I'm using a PIC18F452 on my other device. I'm a newbie,what's the best microcontroller that will satisfy my need of this device. If there any similiar projects that I can learn from,plz tell me. Look forward to reponses. If this post is unclear,tell me where and I'll explain more.

 

[jshroff]

superimpose video embedded

These are pretty simple requirements a range of micros could fit in.

I would suggest

1. Pic - Since you are already familiar with them
2. AVR - similar to pics.
3. NEC has a number of micros that would also work.

I guess you need to provide more info, eg. is this a price sensitive item and so on.

 

[IanP]

If you know how to use PIC18F452 I would suggest that you stay with this CPU.
It has UART to comunicate with BOB-3 and speed sensor and has enough standard I/Os to control external A/D converters et cetera.
It really doesn't matter that you have only one UART: you will read information from speed sensor and you will write, or send, serial string with ASCII characters to BOB.
This can be done in a certain sequence: read data, convert to ASCII numbers and send to BOB-3.
I think changing horses to often is not good idea ..

 

[bad]

Try to use Cygnal microcontrolers -
https://www.silabs.com/tgwWebApp/appmanager/tgw/tgwHome
or old site www.Cygnal.com

it's a litle bit complicated but most powerfull in MSC51 series!

 

[tgq]

This aspect of the project has 2 sensors,current and voltage are feed to an analogue mulitplixer then an ADC then 8bits to controller.

you dont need too do this, 18F452 has several multiplexed analog inputs and embedded ADC
you need : 2 analog input for sensors, 6 or 7 for LCD and 1 for RS232. a 16F88 is enough for all of this.