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Here’s the pinout of ATtiny45/85 for reference: Here are the connections you need to make – note that because Arduino is already supplying 5V, I have detached the USB connector and used two jumper …

Communication Interfaces • USB 2.0 OTG-Compliant Full-Speed Interface • Four UART modules (15 Mbps) - Supports LIN/J2602 protocols and IrDA®

The CP2101 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS232 designs to USB using a minimum of components and PCB space.

Figure 4 - Converting 6 pin to 10 pin Figure 5 - ISP Pinout Now run a programmer, and try reading the chips signature bytes. For example PonyProg or avrdude could both be used, to use avrdude type at …