> In quantities of 1, a discrete logic chip is around 50 cents, while that microcontroller is $2.50 The article also mentions that ATMEGA809 should work here,

> In quantities of 1, a discrete logic chip is around 50 cents, while that microcontroller is $2.50 The article also mentions that ATMEGA809 should work here, and costs about $1.53 in singles https://www.digikey.com/en/products/detail/microchip-technology/ATMEGA809-AU/10444894 https://www.digikey.com/en/products/detail/microchip-technol... > I built two prototypes, one with an AVR128DA48, and one with the older ATmega4809 which is pin compatible, and their performance was indistinguishable. The program only uses about 1500 bytes, so an ATmega809, ATmega1609, or ATmega3209 should be fine