I started to build a WordClock which is my first DIY project, since I'm a beginner I'm having trouble connecting the parts in this schematic.
The thing is that I bought an Arduino UNO and the schematic shows all the parts that conform the UNO, so I don't really understand where to connect the buttons (minute, hour) the "IT IS" cathode and the LEDs common anode, as well as the different grounds.
Here is the link to the schematic: http://www.highonsolder.com/display/ShowImage?imageUrl=%2Fstorage%2FWC%2FWord_Clock-Schematic.JPG%3F__SQUARESPACE_CACHEVERSION%3D1294531692634
I would really appreciate your help so I can finally get this done!
I started to build a WordClock which is my first DIY project, since I'm a beginner I'm having trouble connecting the parts in this schematic.
The thing is that I bought an Arduino UNO and the schematic shows all the parts that conform the UNO, so I don't really understand where to connect the buttons (minute, hour) the "IT IS" cathode and the LEDs common anode, as well as the different grounds.
I'll attach the schematic.
I would really appreciate your help so I can finally get this done!
Does this help with the physical pins to Arduino names?
// ATMEL ATMEGA328P / ARDUINO
//
// +-\/-+
// PC6 1| |28 PC5 (AI 5)
// (D 0) PD0 2| |27 PC4 (AI 4)
// (D 1) PD1 3| |26 PC3 (AI 3)
// (D 2) PD2 4| |25 PC2 (AI 2)
// PWM+ (D 3) PD3 5| |24 PC1 (AI 1)
// (D 4) PD4 6| |23 PC0 (AI 0)
// VCC 7| |22 GND
// GND 8| |21 AREF
// (D 20) PB6 9| |20 AVCC
// (D 21) PB7 10| |19 PB5 (D 13)
// PWM+ (D 5) PD5 11| |18 PB4 (D 12)
// PWM+ (D 6) PD6 12| |17 PB3 (D 11) PWM
// (D 7) PD7 13| |16 PB2 (D 10) PWM
// (D 8) PB0 14| |15 PB1 (D 9) PWM
// +----+
//
// (PWM+ indicates the additional PWM pins)
Several of the components to the left of the microcontroller are part of the Arduino already:
crystal & caps
reset resistor and DTR capacitor
power pin capacitors
power indication LED
The rest looks to be shift registers with ULN2803 buffers to sink current from common anode displays.
You could replace each HCF4094/ULN2803 pair with a TPIC6595 shift register instead.
I offer a board with up to 12 TPIC6B595 that does what this schematic does to control up to 12 digits. Only the buttons would need to be added:
http://www.crossroadsfencing.com/BobuinoRev17/
You can get UNO's diagram here.
If you compare the diagrams, you can work out that the minute button connects to digital pin 2 and 5volt of the UNO. And the hour button to digital pin 3 and 5volt.
The two 1k resistors from the buttons to ground are not on the UNO, so you have to add them.
The IT IS common cathode goes to a ground pin.
And the LEDs common anode to the 5volt pin.
Pin 12, 13, 14, 15 on your schematic is digital 6, 7, 8, 9 on the UNO.
Pin 20 on your schematic is already connected to 5volt.
The two vertical lines from pin 16 of the HEF4094s need to be connected to Arduino's 5volt.
The optional photo resistor on your schematic is connected wrong.
It goes between pin 23 and +5volt on your schematic.
Pin23 is analogue 0 on the UNO.
If you want to use a sensor, connect a 10k resistor between analogue 0 and +5volt
And a 10k resistor between analogue 0 and ground.
The rest of the parts is already on the UNO.
Leo..
Please do not cross-post. Threads merged.
Each of the shift register chips will need decoupling - always decouple logic chips, its the law!