Hey, this might be a simple fix, but I'm at my wit's end. I was following the 'ShiftOut' tutorial on this site and I'm not sure what's gone wrong.
On the HelloWorld example in stead of counting in binary up to 255 the output is simply blinking the bits in the 1's, 64's and 128's place. (with the last two bits much weaker than the first)
I changed the code to just hold the number 255 to troubleshoot. When I used my DMM I found that the voltage across the LEDs are as follows:
1's place: 3.86V 2's place: 1.897V 4's place: 1.89V 8's place: 1.89V 16's Place: 1.89V 32's place: 1.89V 64's place: 1.727V 128's place: 1.722V
Still only places 1, 64 and 128 are lit. I have tried reversing the polarity on the LEDs and they are all oriented the same. has anyone had this issue when trying this tutorial or have any suggestions as to what to try?
my specific chip is the Texas Instruments sn74ch595n if that matters.