What is it?

It is a simple Tally Counter for counting people in places, help you in inventories, practising soldering, etc

Why did you make it?

To learn basics about PCB design and air solder stations. It also helped me to explore XLP capabilities (Extreme low power technology)

What makes it special?

It is a very easy project that can be mounted by anyone.

Working modes

• press + / press - button: Increase/Decrease count
• Long press +: Sound event -> activate/deactivate sound buzzer every button pulsation.
• Long press -: Reset event -> Reset the count.
• 60s without pressing any button: Deep Sleep mode -> Display is off and saving mode is activated. The count is kept
• Any button pulsation in Deep Sleep Mode: Count as normal AND reactivate the device.

Power Consumption

With a cr2032 battery cell of 220mAh: Deep Sleep Mode: up to 50nA (Can be assumed to be 0). The battery self-discharge will actuate first. Working with sound and display on (Worst scenario) 100% time: 7.61mAh. The battery will last 30h of usage. Working with the display on 100$ time: 6.27mAh. The battery will last 35h of usage.

Please keep in mind that the time is showed in "usage time", real-time will be extended depending on personal use.

DIY

It only has the microprocessor (PIC18LF14K50) soldered, with the software on it. You will need to solder the rest of the parts. Everything is included in the KIT.