Do you have a question on Embedded electronics and controls? Ask our Expert, Paul Clarke

You need to tell us more about the LCD displays and what you are trying to do with them. There is also a bit of confusion in your 3 rd paragraph when you say "connected to a 8 bit serial bus" - I think you mean parallel.

The LCD chips will probably have some control lines as well as CS and data  -we need to know about them and we need to know what you are thinking of using to drive them all.

The more devices you connect in parallel the slower the data transfers will be and the more data integrity problems you will have. These problems will get worse if the phyiscal distance between displays is large.

But there are solutions to drive any number of displays ......

Michael Kellett

Hai Paul ,

I am  stuck with one  problem, I am trying to send AT commands from USBSTK5515 to GL865 in my project i have configured UART correctly(checked with loop back test) .In loop back mode I have send "AT"  and recieved it back(Through UART).When i Connected the GSM/GPRS modem the Modem is not replying back with OK. I have used  one TI level translator(TXS0102) in between the two modules to convert 2.8 to 3.3 and vice versa also.I have connected the TX pin of dsp to RX pin of Telit and vice versa. I din't touch that flow control inputs Like RTS ,CTS .Can u please help me to figure out what is the issue

Regards,

Anandu

Hello Paul,

          I am a beginner in embedded programming...

          I have a question  of  AT89C51 programming....  The chip is programmed with a simple flashing LED at port-1 bit-0 for  2sec. I need to check it. What are the minimum connections for AT89C51 to execute the code in it..?

Hello Sir,

I want to know that :

1. Why do we write hex numbers like 0x40,0xF9,0x00 ....  in C programing for displaying 0,1,8 ....  of a 7 segment LED.What is the meaning of ' 0x_ _ '  ? The binary equivalent of 40H is ' 1000000 ' but for displaying ' 0 ' in 7 segment led we have to provide signals as ' 0000001 ' on pins a,b,c,d,e,f,g  in common anode configuration. So I want to ask why do we write reverse binary digits pattern & convert this in hexadecimal?

2. What is meaning of  ' TL0=0xf6 ' to load timer0 for AT89C51 microcontroller while programing in C ? Is 0xf6 also hexadecimal?

Thanks

Hi Paul ,

I would like to ask you some questions regarding about the project i am working on. I am doing home automation project with energy saving which will control the lights and security system. I need to send lots of commands using Zigbee and Dallas or 8051 microcontrollers in Keil C programming. Zigbee will send data to 8051 and 8051 have to process and send it back to zigbee. I have done with serial initializing parts but i got no idea how to receive serial string and trasmitting. so how can i do it ? is there any way you can help me?

with regards ,

wmt

DUMPPING PROCEDURE:-

How to dump a program into micro controller (MPC 5604-B)using CODE WARRIOR and RAppid..

Hi Paul

I am New to this site not long received my Raspberry Pi from RS it’s still in the box! Time is very precious; I wonder could you help with my indecision

I have over 25 years experience in computers and computer programming, and analysis

I am looking at interfacing software with the outside world (biofeedback loops) ref: AI, the problem is what platform to use, I don’t want to limit my options by choosing the wrong (lest appropriate) platform. But at the same time I want to make the interfacing as easy and as flexible as possible

My options appear to be:

Arduino ( looks good but I worry that this is limited re its language etc.)

Raspberry Pi and GertBoard ( don’t know much about this board but get the feeling that the Raspberry Pi would be very flexible in obtaining data and processing it

Axion  (http://www.societyofrobots.com/axon2/#cart_restore) amazingly simple piece of kit.

(Atmel,Pic,Stamp,Arm etc...)

Your opinions and any pointers you can give me would be very much appreciated

Regards

Kevin

hi Mr.Paul ,i want to ask for help about the circuit components for induction heater for melting the metals ,how can i control the circuit to generate heat sutable for this purpose ,circuit diagrames or any datasheet will be appreciated

Good Luck

Hi sir,

     I have one doublt in embedded system, please clarify me. My question is about SIM card as a external memory to 8051 microcontroller ( i use P89V51RD2FA,512P89V51RD2FA,512 isp microcontroller. ).

how to use the sim card as a external memory for microcontroller, is it possible ? , if possible which protocol use for done that, please provide C code and circuit schematic for to do that.

i am not well in english, so please sorry for any gramettical or any other mistake.

Thanks and Regards

Suresh.

@Kevin,

The Pi is pretty awful at interfacing (very limited IO, poor software support for that IO, 3.3V only digital interface). If you add a Gertboard (which you will need to reverse engineer or wait a long time for) you can improve things a lot but mainly by programming the Atmel chip on the Gertboard.

The Axion board looks OK (an Atmel 8 bit processor on a simple board) which you could program in C using free tools.

The Arduino is also Atmel 8 bit based and you can program it in C or its own Arduino way - it has a LOT of communit support and it's cheap - probably a good start.

If you are more ambitious go for something like the ST Cortex M4 Discovery board, about £10, fats 32 bit porocessor with good on chip peripherals - free tools , much less specific community support but much more powerful than Arduino, Axion or Gertboard (for quite a lot of stuff arguably more potent than an RPi - eg it can get analogue data into internal memory at a rate of better than 1Msample/sec without ANY external hardware).

Michael Kellett