SII M1632 LCD working!

Using Arduino Displays
1

This is somewhat of a response to a previous topic on SII (Seiko) M1632 LCD display not turning on (original post: Can't get LCD M1632 to work).

These displays have a different layout than the common 16x2 LCD display used. Those have 16 pins in a single row above the screen, and the M1632's have 7 rows, 2 columns to the right of the display, but I believe both use the HD44780 driver chip.
image

Anyways, I believe that the reason the original poster was having issues with the display was they didn't connect the pin labeled as 'V5' in the diagram. I traced this pin to 'V5' on the HD44780 chip. The schematic says this is for 'waveforms' and it seems to go to ground with a resistor? I connected this pin to ground with a ~500 ohm resistor and display seems to work using the 'HelloWorld' LiquidCrystal library example. I've tried grounding this pin without resistor and it seems to work the same.

This is what I got currently working with the 'HelloWorld' example code:
Vcc ->Vcc
GND ->GND
V5 -> 500 ohm to GND
RS ->12
R/W ->GND
E ->11
D0->/
D1->/
D2->/
D3->/
D4 ->5
D5 ->4
D6 ->3
D7 ->2

2

That's not V5! It's pin 3 which is labeled VEE on the diagram shown in your link but is frequently labeled VS or VSS in other diagrams.

Your solution, regardless of how you describe the pin, is correct.

Don

1 Like
3

Hey Don (and post readers).

Just to clarify, the original post did reference this pin as 'VEE'; the original poster referenced a post that had the pin as 'Vlc'. I labeled it as 'V5' since that's I tracked that header pin to pin 30 (V5) on the HD44780.

image
image207×520 8.72 KB

Snippet of HD44780 pinout

Documentation on this LCD module is sparse, no wonder there's so many labels for this one pin! Hope that helps.

4

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.