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Dev Timer Project

by nytpu

Favorited Favorite 0

A timer to control a film enlarger and to assist with timing development & fixing.

Parts usage:

  • LED Bar graph — For displaying time remaining in light-sensitive settings
  • Shift register — controlling bar graph
  • LED Display — more easily-readable output
  • LED Display driver — controlling LED display
  • Spring terminal — Connecting to Power relay
  • Power relay — Used to turn enlarger on and off
  • DIP Switch — setting timings and configuration
  • Momentary button — advancing menus and triggering timer actions
  • Capacitors, crystal, sockets — ATMega accessories
  • ATMega microprocessor — gee i wonder
  • Barrel Jack and DC/DC converter — powering project

Things to also get (for me, not part of the project):

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Product Subtotal Qty
Momentary Button - Panel Mount (Black)
In stock COM-11996 		1.05 1   
10 Segment LED Bar Graph - Red
In stock COM-09935 		2.25 1   
Spring Terminals - PCB Mount (2-Pin)
In stock PRT-08073 		1.5 1   
IoT Power Relay
Out of stock COM-14236 		34.95 1   
DIP Switch - 8 Position
In stock COM-08034 		1.6 1   
Capacitor Ceramic 22pF
In stock COM-08571 		0.6 2   
Crystal 16MHz
In stock COM-00536 		1.05 1   
SparkFun Snappable Protoboard
In stock PRT-13268 		8.95 1   
Shift Register 8-Bit - SN74HC595
In stock COM-13699 		2.1 2   
7-Segment Display - 20mm (Red)
In stock COM-11405 		1.6 1   
LED Display Driver (8-Digit) - MAX7219CNG
Retired COM-09622 		10.95 1   
Cannot be ordered at this time.
DC Barrel Jack Adapter - Breadboard Compatible
In stock PRT-10811 		1.05 1   
DIP Sockets Solder Tail - 28-Pin 0.3"
Retired PRT-07942 		0.24
You save:
0.71 (75%) 		1   
Cannot be ordered at this time.
DC/DC Converter - 5V 5W (R-78E)
Retired COM-14453 		4.95 1   
Cannot be ordered at this time.
AVR 28 Pin 20MHz 32K 6A/D - ATMega328P
Retired COM-09061 		3.95 1   
Cannot be ordered at this time.
Total: 76.79
Start a project on Hackster.io with this stuff

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