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NACHBAU Assembly Instructions

Author: Christian Aschof, [email protected]

Version 0.4 from August 10, 2012

Translator: Hesky Fisher, [email protected]

These instructions are for:

The NachBau_V02-Board was built

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to:

To-Do:

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Summary of Contents for NachBau V02-Board

Page 1: ... are free to copy distribute and transmit the work to adapt the work With the following requirements Attribution You must attribute the work in the manner specified by the author or licensor but not in any way that suggests that they endorse you or your use of the work Noncommercial You may not use this work for commercial purposes Share Alike If you alter transform or build upon this work you may...

Page 2: ...ly when the displayed text is time dependent e g automatic displays of We re open We re closed driven by opening hours etc The idea for this board came from the QLOCKTWO replica project There are instructions at http code google com p grosses bastelwochenende on how to assemble a word clock from many parts To somewhat tame the chaos and failure rate Justin and Anool from WyoLum redesigned and stre...

Page 3: ...ou use super bright LEDs then you must never look directly at the LEDs especially while uploading the firmware since random lights may turn on due to junk data in the shift registers An LED matrix driven by multiplexing operates at high frequency and causes electromagnetic interfe rence in the form of radio waves This currently interferes with the DCF77 receiver which we plan to fix For other thin...

Page 4: ... Removed color values of resistors Current firmware and related files http code google com p grosses bastelwochenende Wyolum distributor of the board and kit http wyolum com Schematics and Gerber files http code google com p clockthree Author s blog http christians bastel leben blogspot com Arduino http www arduino cc Jee Labs RBBB USB BUB http jeelabs org Reichelt http www reichelt de Pollin http...

Page 5: ...resistors 5 buttons Mode H M Enter and Reset with pull down resistors Anode multiplexers shift registers Darlington arrays filtering capacitors terminal block Cathode multiplexers shift registers current limiting resistors terminal block FTDI and ISP Headers for firmware updates 3 3 Volts for DCF77 Prototyping Area Photoresistor and resistor as voltage divider Stack L for larger matrices Stack R f...

Page 6: ... supply For automatic time updates you can add the DCF77 receiver The time will update any time it receives a valid signal The receiver can be left on permanently by using the jumper on the receiver terminal strip to connect P to or you can connect P to D and which connects pin D13 on the ATMEGA328 MCU to PON and you can set the pin high to turn the receiver off when you like If you have a stable ...

Page 7: ...re the same A resonator consists of a crystal with two capacitors You should choose whichever one is easier to find Make sure to line up the small semicircular notch in the short side of the ATMEGA328 with the mark on the board Experienced solderers can attach the MCU directly onto the board Beginners should use the socket Make sure to line up the notch in the socket as well and later add the MCU ...

Page 8: ...er on a jumper that we can use to choose between USB and external power Required parts Placing the parts 1 Pinheader 3 Pins 1 Jumper We use this jumper to choose the power source either the FTDI connector Position USB or an external supply Position WALL Then we ll attach the power LED so we can tell when the power is on 1 red LED 1 1 kOhm Attention The LED has a long and a short leg The long leg s...

Page 9: ... to add a button If it is not then the Reset pin of the ATMEGA328 MCU will hang and the microcontroller will constantly reset itself If you have an FTDI cable or a USB cable and a USB BUB e g from Jee Labs then you can now test the ATMEGA328 MCU Open the Serial Monitor in the Arduino IDE with the right settings Serial Port something with USB The name is different on every system Board Arduino Duem...

Page 10: ...use Make sure to align the voltage regulator so that its metal plate will lie on the rectangular solder plate Face the side with writing toward the real time clock area and face the metal part toward the open source hardware logo The large capacitors 100 µF have polarity The leg with the minus sign goes in the hole with the mark The two capacitors negative poles face each other There are two holes...

Page 11: ...fore soldering the battery holder tin the round pad with the minus sign to make sure the battery makes a good contact with the board The time crystal is soldered so that when bent over the housing will lie on the long rectangular solder pad In contrast to the crystal next to the ATMEGA328 MCU here we do need the ground plane Those interested in the details should google dallas real time clock crys...

Page 12: ...ground then the receiver will stay on permanently Alternatively you can connect it to pin D13 of the ATMEGA328 MCU so you can put the receiver to sleep whenever you want The pin assignments on the board correspond to the receiver by Pollin Other receivers might require extra circuitry which can be placed in the prototyping area of the board If the receiver has a good signal then the yellow LED wil...

Page 13: ...rrays face opposite directions You can use the jumper to change the voltage input of the Darlington arrays If it is set to 5V then they will get the same 5V as the rest of the board If it is set to Vext then it will receive its input directly from the external power supply You can use this to change the brightness of the LEDs However if you use this then you must figure out on your own what value ...

Page 14: ...Ds need resistors However the Darlington arrays have resistors so these may be enough and there have yet to be reports of LEDs burning out Especially since the silver wires that connect the LEDs in the matrix are good heat conductors and good heat removal is essential to the long life of LEDs So thrill seekers can replace the resistors with wires or jumpers Those who want to be sure can add the re...

Page 15: ...tached to one of the analog pins on the MCU solder on 1 100 nF The first column of the prototyping area is attached to Vcc and the second to ground The other holes are connected to each other in rows of three You can burn a bootloader onto the ATMEGA328 MCU using the ISP header Connection for the photoresistor and resistor as voltage divider These resistor slots remain empty This resistor is no lo...

Page 16: ... 8 7 6 5 4 3 2 1 Anode pins rows are numbered from left to right Cathodes pins columns are numbered from right to left Top left Top left Top right Top right Bottom right Bottom right Bottom left Bottom left CONGRATULATIONS The pairs of pins are all connected in tupels e g for corner LEDs ...

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