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Martin's PPM tester advice please
Posted: 17 Jun 2019, 16:07
by Tommy_Boy
Just completed the tester, used a blue 1.3" 4 pin display, mine seems to work fine, then freezes @ various times. The onboard led also seems to flash when things are working. any thoughts?
thanks,
T
Re: Martin's PPM
Posted: 18 Jun 2019, 15:48
by Phil_G
Hi Tommy, most likely it could be that the I2C lines (SDA & SCL) each need a 1k pullup resistor to 5v. We normally get away without but the I2C spec says they really should be present. Its definitely a hardware problem, Martins code is solid. The flashing led is normal
Hope this helps
Phil
Re: Martin's PPM
Posted: 18 Jun 2019, 17:30
by RON
Definitely the pull-ups. On a display from eBay I purchased recently, It would work without the pull-ups but kept locking up and freezing. As soon as the pull-ups were present it cured it.
Ron.
Re: Martin's PPM
Posted: 19 Jun 2019, 03:39
by Tommy_Boy
Thanks for the replies! I;ll give the pull=ups a go for sure!
What a neat little project, I really like the o=Scope trace!
T
PS I also got Phil's PPm Anaylzer working as well, solid as a rock!!
Thanks for the Code!