Anyone feel like troubleshooting a board layout? This is an ESP carrier board with an ATTINY 85 on it for dedicated hardware PWM. The problem is, the Tiny isn’t recognized by the SPI programmer through the 6 pin header.
I’ve made sure there’s no solder bridges on the chip, and also tried removing the two 4.7k pull-up resistors (r2 and r4) on the SDA and SCL lines, as SCL is also used by SPI as the clock line. I verified proper voltage on the supply pins, and verified continuity to all pins. I must be missing something simple?
The ESP module has not been placed yet, just the T85, the voltage regulator and the passive components.