KnutOlafson
Member level 1
When I power this device using first 3 pins ( Vss=GND, Vdd=+5V, Vo=GND) I do not have "bars" (restangles 5x8 in line.. ... in one or more lines). On another hand, all other character LCDs I have here has regular bars when "powered" this way.
Another problem when I put this LCD in circuit - it has nothing at start, then it starts up with "bars" but not consistent in light intensity between cells and trembling, and then at the end, when some commands are send from mcu (program executed) I have regular "bars" with same light intensity on LCD but nothing else. Just stacked with "bars" there.
Now, I am wondering if there is any instructions how to check if all pins are OK while powered off - disconnected?
Is there any characteristics regarding resistance, capacitance or anything else on LCD's pins and between which pins?
Is there any differences in those values between 16x2, 20x4, 40x4 models?
Another problem when I put this LCD in circuit - it has nothing at start, then it starts up with "bars" but not consistent in light intensity between cells and trembling, and then at the end, when some commands are send from mcu (program executed) I have regular "bars" with same light intensity on LCD but nothing else. Just stacked with "bars" there.
Now, I am wondering if there is any instructions how to check if all pins are OK while powered off - disconnected?
Is there any characteristics regarding resistance, capacitance or anything else on LCD's pins and between which pins?
Is there any differences in those values between 16x2, 20x4, 40x4 models?