Matrix user forums

Hi JonnyW

Is what you require only ever going to be from a 4 byte value?

No the bytes might be an array of up to 8 or more 8bit bytes.
Your second code block look like it might work, I'll play around with it to see if I can get it to work.

Thanks for the help. In the meantime I will tri and get some results on my side.

Enamul

If I understand it correctly this will work.

Hi Enamul

I would appreciate a flowcode version. I saw the c code in Wikipedia but cannot make out heads or tales about c code
For now I can only program in flowcode & assembler "Only starting to learn C"

Hi guys

How can you do a 2 byte Fletchers Checksum over a range of say 4 bytes in Flowcode V5

Hi Enamul

How can I make an external interrupt for rx like Ben suggested?

You can improve the receive functionality by using an external interrupt to synchronise the read function with the incoming start bit.

Hi Enamul

I’m receiving from one & sending to another weighing Instrument so on the receiving side I'll use RXint & on the TX side I'll use software TX I just hope a 4MHz crystal will be fast enough with a 9600baud.

Enamul

Thanks for the reply; I only need the software port for sending data so this will work.
Just wasn't so sure about the RXInt.

Hi Guys On a Pic16f887 if you use RS232 from the hardware Port C6 &7 and it transmit & receive successfully and you change the uart to software and move tx & rx pins to Port C0 & C1 should the program still function normal with RXInt or must I change something else :?: I need 2 x RS232 ports but can...

Hi Enamul

At last I got it to work with RXint.
Thanks for the support.

Hi Enamul Thanks for the reply, the RXInt is working realy well with one byte at a time but when I receive a string of 14 bytes at once and try to read one byte from the string like Data[4] the lcd display nothing. Sending one character at a time like ascii "A" prints on the lcd but sending "AA" lea...

Hi Guys

What would be the best way (Array or String) to read 8 packets of 14 bytes coming in every 10sec via rs232
I want to keep the data in bytes so some of it can be changed and send back out after a few seconds.

Hi guys

Do any of you have some sample code or Ideas on how to control/read an AD7710 ADC with a pic16f887 via flowcode?
Any help would be appreciated.
The sample they give on the data sheet doesn't really help.

Thanks

Hi Martin

The voltage at the input pin is 5.00V on the meter and stay the same with all three pic's but the lcd reads 1021 with the 887.
Is it possible for the config bits of the pic to cause this.

Hi Guys

I'm using a V3 Development board with a pic 16F887 but at full voltage the adc reads only 1021.
I've tested the program with a 16f876 & 16f877 and they both read 1023.
Anyone else having the same problem?

Hi Martin

I deleted the ADC component from all 3 locations including the control panel and it worked after replacing it with the ADC component in V5.

Hi Martin

Thanks for the reply
I will test your fix

Thanks for posting this in the V5 section as I am still waiting to be added to the V5 section.
Only installed V5 on Saterday

Hi Guys My program does not want to compile in Flowcode V5 but compiled without errors in flowcode V4. Are there any differences in the C-code of V5? :x This is the errors from V5 VR Weighing Scale V2.5A.c(719:23): error: unknown identifier 'ADCS2' VR Weighing Scale V2.5A.c(719:23): error: invalid o...

Hi Martin At last I completed my project but not without one last problem. I've tested the software with a pic16f877& 876 and it worked without a problem, BUT when I loaded it on the "compatable"16f887 :x " the software only works up to where the A to D should start reading then the pic stops respon...

Hi Martin

I'm storing the calibration values to eeprom so I don't have to re-calibrate the scale every time I switch it on.
Can you please tell me where the zero value are stored so I can save it to eeprom like the span?

Hi Martin

Sorry for the inconvenience.
I had an IO error on my side “Idiot Operator", I've loaded the wrong software version.
The program is working just fine.
At last now I can buy flowcode 5

Hi Martin

Are there any way to stop the scale from subtracting the zero from the full load?
If I set my zero at 10% and my 500kg at 90% the scale shows 445kg instead of 500kg because of the zero subtraction.

Hi Martin I've uploaded a sample of the scale I'm trying to build. This is a short description of how the scale should work. 1: Press start and then calibrate button within 2 sec from start up the scale will go into calibration mode. 2: Set ADC value were the instrument should read 0kg. Say "10%" an...

Hi Martin

If you state 0 ADC = -xx.xxKg
and 1023 = xx.xxKg then I could create a new formula for you to do a direct conversion

My 0 ADC = -25kg
and 1023 = 525kg

The scale will be going up in 25kg increments up to 500kg stopping at each 25kg weight to take a reading from a unit under test.

Hi Kersing Thanks to everybody that helped me so far with my project At the moment I'm using an AD620AN amplifier to amplify 0 to 30mV signal from a load cell to 0-5V & two 10k pots on Vref + & - to adjust zero & span. The reason I asked was to try and set the zero & span with software instead of po...