Do you want to have the AXE133Y itself do the bargraph display or do you want it controlled by serial from another PICAXE ?
For serial control ( and for directly connected LCD ) you'll need to determine what characters to put in each display position. You can either have a chunky display with each character having all pixels on or off or a more fine display of varying width bars using CGRAM characters. For direct OLED control you can probably take advantage of the OLED's 'graphics mode' capability.
Two other questions which will help is what is the input value, that is what determines a zero setting, leftwards or rightwards, and what do you want displayed when the value is zero and the display is centred ?
You're probably best off coding for a simple left to right bargraph to start with then using the experience from that to create a centred display. Here's a simulated way to do that ...
Code:
#Picaxe 20M2
#Terminal 4800
#No_Data
Symbol CHARS = 16 ' 16 character display
Symbol adc = b0
Symbol pixelsOn = b1
Symbol charsOn = b2
Symbol charsToDo = b3
Do
ReadAdc c.1, adc
SerTxd( #adc, 9 )
pixelsOn = CHARS * 5 - 1 * adc / 255 + 1
charsOn = pixelsOn / 5
pixelsOn = pixelsOn // 5
charsToDo = CHARS - charsOn
Do While charsOn > 0
SerTxd( "#" )
charsOn = charsOn - 1
Loop
If pixelsOn <> 0 Then
SerTxd( #pixelsOn )
charsToDo = charsToDo - 1
End If
Do While charsToDo > 0
SerTxd( "_" )
charsToDo = charsToDo - 1
Loop
SerTxd( CR, LF )
Pause 500
Loop
A "#" means a full block character, a "_" means a space character, "1" through "4" means a block character of 1 through 4 pixels wide on from the left. This always has the left most pixel bar set when zero. If you don't want anyting for zero -
pixelsOn = CHARS * 5 * adc / 255
