One More Question
After the goof with the Iset resistor, all of the segments came on in test mode except the 'd' segment of right-most digit. I thought I could figure it out or Google it, but no luck. I've tried changing out the MAX7221 IC and swapped the two four-digit LED displays I'm using. The segment lights up if I power it independently, but the two MAX7221 chips I tried won't. This digit is the farthest from the MAX and I tried adding an additional jumper wire at one point to reduce resistance, but to no avail. The datasheet mentions wiring inductance and EMI, but I'm not sure how to limit that on a breadboard. I've included a picture. Any suggestions?
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