Your friendly neighbourhood timer.
This project is a general purpose hardware timer based on Arduino.
It uses the Arduino Nano as the controller, WE___ 16*2 display and push buttons to interface with the timer.
The UV is driven by IRFZ44N mosfetand two L7805CV regulators are placed in parallel to help provide current for heavy loads.
The UV Timer can be powered by a 12V or 5V adapter.
A jumper (Jx) is provided that can be used to set the voltage for the load (5V or 12V).
The schematic and PCB for this project was designed using Kicad EDA.
->Schematic "/././.sch"
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-> PCB "/././.pcb"
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Fabrication of the PCB for this project was done in-house at @Robotics Club,Pulchowk Campus.
The fabrication method and guide used can be found here
PCB BACK PIC
PDB FRONT PIC
List of all components/modules used in the project. This was automatically generated using Kicad's BOM generator.
| Reference | Value | Footprint | Qty |
|---|---|---|---|
| C1 | C | 1 | |
| C2 | C_Polarized | 1 | |
| D2,D3,D4,D5,D6,D7,D8,D9,D10,D11,D12,D13,D14,D15 | LED | LED_THT:LED_D1.8mm_W3.3mm_H2.4mm | 14 |
| J1 | Conn_01x07_Socket | Connector_Molex:Molex_KK-396_5273-07A_1x07_P3.96mm_Vertical | 1 |
| J2 | Conn_01x09_Socket | Connector_Molex:Molex_KK-254_AE-6410-09A_1x09_P2.54mm_Vertical | 1 |
| R1,R2 | R | 2 | |
| SW1,SW2,SW3,SW4,SW5,SW6,SW7,SW8 | SW_Push_Dual | SW_PUSH_6mm_H5mm | 8 |
| U1 | TSSP58038 | OptoDevice:Vishay_MINICAST-3Pin | 1 |
The code for this project can be found in UV_Timer/Software/UV_timer.ino
The timing is handled by arduino's millis().
If precise timing of very short durations is required the Atmega's internal timers can be used.
PAUSE BUTTON(SWx) IS UNUSED , insteadON BUTTON(SWy) is used for start/pause.
The hardware, logic, and code are by no means the most efficient and professionally designed. There still exits many faults and improvements . Thus any modifications and improvements are highly encouraged.