PIC to PIC and output on LCD - Page 2 - Electronic Circuits Projects Diagrams Free

pouchito · 7th June 2007, 12:49 AM

it s true that picbasic is easier than the asm,but my problem is that the other part of my project are written using asm :S

gramo · 7th June 2007, 02:24 AM

For most small applications, there is no need for encoding the data. It's a fiar bit of overkill, and there are many radio modules that simply run with UART data as they encoded/decode it on the fly

I take it your using Proton still? In that case, have a look at this code'

TX;

Code:

Device = 16F628A

Symbol Key = PORTA.0                 ' Define which Pin the Button is on

' Start of program;
ALL_DIGITAL = True                   ' Make all I/O's digital

Input Key                            ' Make the Key pin an input

While 1 = 1                          ' Create an infinate loop
    RSOut "Header", Dec Key, "Z"     ' Send the current status of the key
    DelayMS 100                      ' Delay for 100mS
Wend                                 ' Loop for ever

RX

Code:

Device = 16F628A

Dim Key As Bit                              ' Define a register for the Key data

' Start of program...  
ALL_DIGITAL = TRUE                          ' Make all I/O's digital
Low PORTB.1                                 ' Set up the IDLE state of the RSIn_Pin

While 1 = 1                                 ' Create an infinate loop
    RSIn Wait("Header"), Key                ' Wait for the text "Header", then grab the key data
    If Key = 1 Then                         ' Check if the key was pressed or not
        Print At 1, 1, "Key is Pressed"     ' If it was then display this text
    Else
        Print At 1, 1, "Released      "     ' Else if it wasn't then display this text
    EndIf
Wend                                        ' Loop for ever

Click here to watch this program and circuit simulated

bananasiong · 7th June 2007, 04:39 AM

Hi,
Since this thread is about LCD, I have one question here.
Usually the Vee pin is connected to a potential meter to adjust the contrast. I found that if I supply the LCD with 3 V, the contrast is suit to me when the variable resistor is fully turned, which is ground level to Vee pin. If I connect this pin directly to ground without any current limiting resistor, is it okay?

Thanks

gramo · 7th June 2007, 05:07 AM

Quote:

Originally Posted by bananasiong

Hi,
Since this thread is about LCD, I have one question here.
Usually the Vee pin is connected to a potential meter to adjust the contrast. I found that if I supply the LCD with 3 V, the contrast is suit to me when the variable resistor is fully turned, which is ground level to Vee pin. If I connect this pin directly to ground without any current limiting resistor, is it okay?

Thanks

I usually only put on the bare minimum when simulating, and using Proteus a fair bit allows me to know a lot of the “back doors”. Makes things look a lot neater and smoother. For Vee (Contrast), connect a 4.7K to 47K potentiometer like this to it. Now you have complete control over the contrast of the LCD.

Dont wire it directly to ground or 5V, as they are both opposite (full and low) limits of the contrast

**Nigel Goodwin** · 7th June 2007, 09:21 AM

Quote:

Originally Posted by pouchito

no, because i don't know how to do it :S

Either read the datasheet (which tells you how), or check my tutorials which have a page telling you how to change from the 16F628 to the 16F877/6

http://www.winpicprog.co.uk/pic_tutorial_changes.htm

It's also pretty important to encode the data via a radio link, it makes it far more reliable and prevents many problems.

ericgibbs · 7th June 2007, 09:44 AM

>> posted by gramo.
For most small applications, there is no need for encoding the data. It's a fiar bit of overkill, and there are many radio modules that simply run with UART data as they encoded/decode it on the fly

I agree with this statement, I have always used the UART data radio transmission format for radio telemetry and never had any problems.
300 thru 9600 baud, upto 10K, LOS.

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7th June 2007, 12:49 AM	(permalink)
pouchito	it s true that picbasic is easier than the asm,but my problem is that the other part of my project are written using asm :S

7th June 2007, 04:39 AM	(permalink)
bananasiong	Hi, Since this thread is about LCD, I have one question here. Usually the Vee pin is connected to a potential meter to adjust the contrast. I found that if I supply the LCD with 3 V, the contrast is suit to me when the variable resistor is fully turned, which is ground level to Vee pin. If I connect this pin directly to ground without any current limiting resistor, is it okay? Thanks __________________ Superman returns..

7th June 2007, 09:44 AM	(permalink)
ericgibbs	>> posted by gramo. For most small applications, there is no need for encoding the data. It's a fiar bit of overkill, and there are many radio modules that simply run with UART data as they encoded/decode it on the fly I agree with this statement, I have always used the UART data radio transmission format for radio telemetry and never had any problems. 300 thru 9600 baud, upto 10K, LOS. __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/