License

The project is under Attribution-ShareAlike 4.0 International (CC BY-SA 4.0).

Libraries used for this project

• adafruit
• darnok_common (https://github.com/konradwilk/eagle-libraries.git)
• darnok_led (https://github.com/konradwilk/eagle-libraries.git)
• darnok_usb (https://github.com/konradwilk/eagle-libraries.git)
• darnok_sensors (https://github.com/konradwilk/eagle-libraries.git)
• darnok_microsd (https://github.com/konradwilk/eagle-libraries.git)
• darnok_4050 (https://github.com/konradwilk/eagle-libraries.git)
• SparkFun-Aesthetics
• SparkFun-Capacitors
• SparkFun-Connectors
• SparkFun-Hardware
• SparkFun-IC-Microcontroller
• SparkFun-IC-Power
• SparkFun-Jumpers
• Serial-Basic (https://github.com/sparkfun/Serial_Basic_Breakout-CH340G.git)

Purpose

Quite simply it is to have a count-down timer for 20 seconds for washing hands. It is activated by a line sensor (which has infrared light) that plugs in the board.

Video (speed up) of text printed.

PCB

The main branch is for development and changes often. The Wash Hand Board and Schematic are available.

Prior versions

There are various branches, see:

• stable-1.3-tqfp
• stable-1.3-dip28
• stable-1.2-dip28

Future plans for software

In particular order:

• Fetch data from a SD-card (if attached), otherwise read from EEPROM (1K).
• Format-type of the data type for above mechanism.
• Utilize sleep operations to keep the CPU most of the time asleep.
• Utilize modulo for the numbers.