HX711

Duval JP · Joined: 22 Jun 2004 Posts: 1161 Location: France

hi,
do you know what is a sub ?
see the help for Gosub
I prefer use call subxxxxx() or using function
that is the fondamental of basic language.

I did an help about starting with Basic langage in french, if you need it let me your mail
JP

odemmo · Joined: 26 Jun 2007 Posts: 19

I am aware of Gosub but where in my code should I insert Gosub Hx711get1, Gosub Hx711get2, Gosub Hx711get3 abd Gosub Hx711get4.
I am aware of the principle of Basic since the 80's with CBM64 but Bascom Basic is more advanced Basic than what I learned then.
I really need this gadget that reads all 4 weights one by one.

I speak only Norwegian and google English Smile

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

there are multiple solutions.
the most simple would be when you use a full port for example PORTB.
Say portb.0 and portb.1 for the first device, portb.2 and portb.3 for the next, etc.

code becomes :

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

- you should start with the code you have for 1 device.
- then show us which pins you have for the other 3 devices.

odemmo · Joined: 26 Jun 2007 Posts: 19

I use this code when I have only one HX711

$regfile = "m8def.dat"

$crystal = 3686400

$baud = 9600

$hwstack = 64
$swstack = 10
$framesize = 24

Hx711_clk Alias Portb.0
Hx711_dat Alias Pinb.1

Dim Hx711ad As Long
Dim Hx711avg As Long
Dim Hx711count As Byte
Dim Average(16) As Long
Dim Avgpoi As Byte
Dim Avgsum As Long
Dim Zeroadj As Long
Dim Stablecount As Byte
Dim Lastvalue As Long
Dim Sensorcal As Long
'
Dim Temp1 As Byte
Dim Temp2 As Byte
Dim Templ1 As Long
Dim Tempstr As String * 40
'
Dim Dummy As Eram Long
Dim Eepprgid As Eram Long
Dim Eepsensorcal As Eram Long

Config Hx711_clk = Output
Reset Hx711_clk
Config Hx711_dat = Input

If Eepprgid <> &H31375848 Then
Eepprgid = &H31375848
Eepsensorcal = 30065
End If
Sensorcal = Eepsensorcal

For Temp1 = 1 To 20
Do

Loop Until Hx711_dat = 0
'
Gosub Hx711get
Gosub Hx711movavg
Locate 2 , 1
Print Hex(hx711avg)
Next Temp1

Zeroadj = 0 - Hx711avg
Stablecount = 0
Lastvalue = 0

Temp2 = 0

Main:
If Hx711_dat = 0 Then
Gosub Hx711get
Gosub Hx711movavg
Templ1 = Hx711avg + Zeroadj

Templ1 = Templ1 * 100
Templ1 = Templ1 / Sensorcal
'
Temp2 = Temp2 + 1
If Temp2 > 10 Then
Temp2 = 0
End If

waitms 100
Tempstr = Str(templ1)
If Templ1 < 0 Then
print Format(tempstr , " 0")
If Temp2 = 0 Then
Print Format(tempstr , " 0")
End If
Else
print Format(tempstr , " 0")
If Temp2 = 0 Then
Print Format(tempstr , " 0")
End If
End If

If Templ1 = Lastvalue Then
Stablecount = Stablecount + 1
If Stablecount > 5 Then
Stablecount = 5

End If
Else
Lastvalue = Templ1
Stablecount = 0

End If
End If
Goto Main

Hx711get:
Hx711ad = 0
For Hx711count = 23 To 0 Step -1
Set Hx711_clk
Waitus 1
Hx711ad.hx711count = Hx711_dat
Reset Hx711_clk
Waitus 1
Next Hx711count

Set Hx711_clk
Waitus 1
Reset Hx711_clk
Waitus 1
'
If Hx711ad.23 = 1 Then
Hx711ad = Hx711ad Or &HFF000000
End If
Return

Hx711movavg:
Avgsum = Avgsum - Average(avgpoi)
Average(avgpoi) = Hx711ad
Avgsum = Avgsum + Hx711ad
'
Avgpoi = Avgpoi + 1
If Avgpoi > 16 Then
Avgpoi = 1
End If
'
Hx711avg = Avgsum
Shift Hx711avg , Right , 4 , Signed
Return

end

but now I want to use there more HX711 on port b2 to port b7

Thanks

O-Family · Joined: 23 May 2010 Posts: 320 Location: Japan

If the questioner has a high level of programming, we can also suggest simplifying the program.
For example, the [PD_SCK] pin is shared by all four ports and connected to one port, and only the [DOUT] pin is received individually by the four ports.
However, since many modifications of the provided test program are required, I proposed a method to make the four easiest subroutines by copying.

Even so, the questioner often doesn't understand the BASIC language.
You'll have to learn a little more and then ask questions or ask for all the programming.

It also does not provide any hardware information such as the power supply voltage (AVDD) for the HX711 load cell or the characteristics of the load cell used.

odemmo · Joined: 26 Jun 2007 Posts: 19

Thanks.
I understand simple basic programming but this is too complicated for an old man like me and therefore I wants lots of help, help with the whole program is of course invaluable help and thanks.
To learn this I think will be very time consuming for a hobby project.
Thanks

O-Family · Joined: 23 May 2010 Posts: 320 Location: Japan

Yes, I think it takes some effort.

The coefficient calculation of the program changes depending on the power supply voltage (AVDD) for the load cell of the HX711 and the characteristics (resistance value and output voltage) of the load cell.
Also, for each of the four load cells, error adjustment and zero adjustment are required, so simply speaking, the program is quadrupled.
It corresponds to the idea of measuring with four separate AVR circuits and summarizing the four results obtained.

Simply asking only the subroutine part of a program can be difficult to solve if you don't know how the entire program works.
It may take some time, but do your best!

odemmo · Joined: 26 Jun 2007 Posts: 19

Finally I got it, tips from you and lots of copying and pasting, I am not a trained programmer but have tried and failed since CBM64 in my youth but this type of programming is very complicated, but I got it.

$regfile = "m16def.dat"

$crystal = 3686400

$baud = 9600

$hwstack = 64
$swstack = 10
$framesize = 24

Hx711_clk Alias Portd.2
Hx711_dat Alias Pind.3

Dim Hx711ad As Long
Dim Hx711avg As Long
Dim Hx711count As Byte
Dim Average(16) As Long
Dim Avgpoi As Byte
Dim Avgsum As Long
Dim Zeroadj As Long
Dim Stablecount As Byte
Dim Lastvalue As Long
Dim Sensorcal As Long
'
Dim Temp1 As Byte
Dim Temp2 As Byte
Dim Templ1 As Long
Dim Tempstr As String * 40
'
Dim Dummy As Eram Long
Dim Eepprgid As Eram Long
Dim Eepsensorcal As Eram Long

Config Hx711_clk = Output
Reset Hx711_clk
Config Hx711_dat = Input

If Eepprgid <> &H31375848 Then
Eepprgid = &H31375848
Eepsensorcal = 30065
End If
Sensorcal = Eepsensorcal

For Temp1 = 1 To 20
Do

Loop Until Hx711_dat = 0
'
Gosub Hx711get
Gosub Hx711movavg
Locate 2 , 1
Print Hex(hx711avg)
Next Temp1

Zeroadj = 0 - Hx711avg
Stablecount = 0
Lastvalue = 0

Temp2 = 0

Main:
If Hx711_dat = 0 Then
Gosub Hx711get
Gosub Hx711movavg
Templ1 = Hx711avg + Zeroadj

Templ1 = Templ1 * 100
Templ1 = Templ1 / Sensorcal
'
Temp2 = Temp2 + 1
If Temp2 > 10 Then
Temp2 = 0
End If

waitms 100
Tempstr = Str(templ1)
If Templ1 < 0 Then
print Format(tempstr , " 0")
If Temp2 = 0 Then
Print Format(tempstr , " 0")
End If
Else
print Format(tempstr , " 0")
If Temp2 = 0 Then
Print Format(tempstr , " 0")
End If
End If

If Templ1 = Lastvalue Then
Stablecount = Stablecount + 1
If Stablecount > 5 Then
Stablecount = 5

End If
Else
Lastvalue = Templ1
Stablecount = 0

End If
End If
Goto Main

Hx711get:
Hx711ad = 0
For Hx711count = 23 To 0 Step -1
Set Hx711_clk
Waitus 1
Hx711ad.hx711count = Hx711_dat
Reset Hx711_clk
Waitus 1
Next Hx711count

Set Hx711_clk
Waitus 1
Reset Hx711_clk
Waitus 1
'
If Hx711ad.23 = 1 Then
Hx711ad = Hx711ad Or &HFF000000
End If
Return

Hx711movavg:
Avgsum = Avgsum - Average(avgpoi)
Average(avgpoi) = Hx711ad
Avgsum = Avgsum + Hx711ad
'
Avgpoi = Avgpoi + 1
If Avgpoi > 16 Then
Avgpoi = 1
End If
'
Hx711avg = Avgsum
Shift Hx711avg , Right , 4 , Signed
Return

end

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

hi

you should use the CODE tags when posting code like this :