DP32, problem with low voltage o/p on pins 9 & 10

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Ian1945
Posts: 2
Joined: Thu Aug 04, 2016 4:26 pm

DP32, problem with low voltage o/p on pins 9 & 10

Post by Ian1945 » Fri Aug 05, 2016 4:25 pm

Hello all,
my first post on your forum.
I have constructed a homebrew chipKit dp32 board, burnt the 'chipKIT_Bootloader_DP32.hex' and have successfully downloaded and run sketches.
A problem has arisen when using the I/O on pins 9 and 10 (PIC pins 2 & 3).
If I define them as outputs and write a 'HIGH' to them, they both go to just over 3 Volts.
If I then execute 'Wire.begin();' , then these pins no longer go to their full voltage, only to 1.4V.
The I2C SDA & SCL on pins 3 & 2 (PIC pins 18 & 17) are functioning correctly and I can write and read an I2C device.
If I write HIGH to pins 9 & 10 and then do an I2C write, the outputs on pins 9 & 10, sit at 1.4V with occasional spikes up to 3.1V.

I have scoured all the info I can find on the DP32, but can't find any reason why this happens.
Perhaps one of you more enlightened people can throw some light on it!

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Jacob Christ
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Location: Southern California
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Re: DP32, problem with low voltage o/p on pins 9 & 10

Post by Jacob Christ » Thu Aug 25, 2016 7:40 am

What is connected to pins 9 & 10? Hare they loaded down and when the other module kicks in the current available drops?

Jacob
PONTECH Quick240 an industrial form factor platform for chipKIT and Arduino users.

Ian1945
Posts: 2
Joined: Thu Aug 04, 2016 4:26 pm

Re: DP32, problem with low voltage o/p on pins 9 & 10

Post by Ian1945 » Thu Sep 01, 2016 6:41 am

Pins 9 and 10 are not connected to anything.

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