Blazemaguire
Senior Member
Hi,
I'm just playing around with one of the fancy 4 line OLED LCD modules - at present i'm just trying to display a realtime reading from an ADC input on the display.
If I power the display from a separate power supply to the PIC (a 20x2 in this case) then the readings are stable and reliable and only vary when I move the pot (as I want). - Im generating the readings from a 10K linear pot in this case.
As soon as I wire the OLED to the same Power supply as the PIC, the readings fluctuate, by as much as + or - 10 points (on a scale of 0 - 255.) - so I can only assume the OLED updating is causing the voltage to fluctuate, and hence the readings on the ADC pin.
I've tried powering with 2AA battteries, and with a 3AA pack. - I've tried powering the PIC from a 4AAA pack with a 7805 regulator and the OLED running from the same batteries but without 5V regulation and it still happens.
Any suggestions of simple circuit fixes? - For the final product i'm developing, I really need it all off the same battery!
thanks in advance.
I'm just playing around with one of the fancy 4 line OLED LCD modules - at present i'm just trying to display a realtime reading from an ADC input on the display.
If I power the display from a separate power supply to the PIC (a 20x2 in this case) then the readings are stable and reliable and only vary when I move the pot (as I want). - Im generating the readings from a 10K linear pot in this case.
As soon as I wire the OLED to the same Power supply as the PIC, the readings fluctuate, by as much as + or - 10 points (on a scale of 0 - 255.) - so I can only assume the OLED updating is causing the voltage to fluctuate, and hence the readings on the ADC pin.
I've tried powering with 2AA battteries, and with a 3AA pack. - I've tried powering the PIC from a 4AAA pack with a 7805 regulator and the OLED running from the same batteries but without 5V regulation and it still happens.
Any suggestions of simple circuit fixes? - For the final product i'm developing, I really need it all off the same battery!
thanks in advance.