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Character LCDs / Re: software controlled contrast is not consistent
« on: September 10, 2015, 02:17:08 PM »
Thanks for the reply.
The contrast difference is quite large, and the darker one is unreadable at some angles. Attached a photo showing a good and bad unit side-by-side.
I measured the voltages on all 8 pins. There is no voltage difference above ~8mV between the two samples.
1. 3.01V
2. 3.01V
3. 3.01V
4. 0 (gnd)
5. 3.01V
6. 5.86V
7. 4.43V
8. 1.51V
Any other ideas?
[attachment deleted by admin]
The contrast difference is quite large, and the darker one is unreadable at some angles. Attached a photo showing a good and bad unit side-by-side.
I measured the voltages on all 8 pins. There is no voltage difference above ~8mV between the two samples.
1. 3.01V
2. 3.01V
3. 3.01V
4. 0 (gnd)
5. 3.01V
6. 5.86V
7. 4.43V
8. 1.51V
Any other ideas?
[attachment deleted by admin]