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Firmware for the Simple USB Power Monitor This download package for the USB Power Monitor includes the .hex file to load into the microcontroller as well as the Arduino sketch source code. Cat No SC3621. Price: Free Files: USB_Power_Monitor_final_software.zip (ZIP contains .hex, .ino & .h files; 18.2KB) Related to: Project: Simple USB Power Monitor (June 2026 [print issue]) Other items relevant to this project: Simple USB Power Monitor PCB [04104261] ($5.00) ATtiny85-20PU programmed for the Simple USB Power Monitor [0410426A.HEX] ($10.00) 0.96in white OLED with SSD1306 controller ($10.00) 0.96in cyan OLED with SSD1306 controller ($10.00) Simple USB Power Monitor short-form kit ($50.00) Simple USB Power Monitor PCB pattern (PDF download) [04104261] (Free)