Hi all,

This update to show some changes to our part list.

As our PCB designer, Dmitry, was looking at the parts, he noticed that the chosen IR LED was a Market Place Product that could only be bought in a quantity of 5,323 and has a separate $8 shipping fee. We don't need that many LED's so we found another one which can be seen in the list below.

We also knew that there were more passive components that could be used with the IR receiver and LED. The diagram below shows that we need an resistor and capacitor for the receiver. We also need a resistor to limit the current for the LED to protect it and limit the max current to 20mA from a single pin for the ATTINY85. Since the LED can support up to 100mA of current, the ATTINY85's output current limit of 20mA is what will limit the LED. To limit part creep, we plan to use the same resistor for the IR LED as for the IR Receiver.

Since we have most of the basic parts here, we've now drawn out the first circuit diagram as can be seen below:

Parts List:

• https://www.digikey.com/en/products/detail/microchip-technology/ATTINY85-20PU/735469
• https://www.digikey.com/en/products/detail/lumex-opto-components-inc/OED-EL-1L2/270797
• https://www.digikey.com/en/products/detail/vishay-semiconductor-opto-division/TSOP58238/4695679
• 2x ~38 ohm resistor
• 0.1uF capacitor