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Arduino Nixie Clock v41

Operating Instructions

Construction Manual

Document V0041a

Summary of Contents for nixie v41

Page 1: ...Arduino Nixie Clock v41 Operating Instructions Construction Manual Document V0041a...

Page 2: ...r information Usually this works out as about 10 Software The software is available on GitHub at the address https github com isparkes ArdunixNix6 releases This board works with Release Revision 4 boa...

Page 3: ...ting allows you to set the the color of the back lighting to practically any color you desire Ambient light sensing with automatic tube dimming which sets the tube and LED brightness according to the...

Page 4: ...not sure what this means please do not use this clock and return it for a full refund A shock from the clock high voltage circuit is at least a nasty bite At worst it can kill you We decline any resp...

Page 5: ...ight This controls the dimming of the tubes 100 darkest 999 brightest Version Display the version number The format will be VV vv 07 where major version is VV minor version is vv and the 21 is the id...

Page 6: ...ed in 12 or 24 hour mode 1 12 hour 0 24 hour default 0 01 flashing Blank leading 0 Blank out the leading 0 from single digit hours 1 blank 0 don t blank default 0 02 flashing Scroll back Use the scrol...

Page 7: ...htening for a second and then darkening for a second but always respecting the relative intensities set by the Red Green and Blue channel intensities Cycle fades the back lighting randomly and does no...

Page 8: ...hanging this is the HV generation is noisy or you have unusual tubes Default 150 Max 50 Min 500 Information Settings 21 flashing Current case temperature Show the current temperature inside the case u...

Page 9: ...or minutes can get dim despite the ACP that is regularly done If you make a super long press of the button more than 8 seconds the clock will enter filament healing mode All the power will be placed...

Page 10: ...might have to provide a heat sink for the the MOSFET and voltage regulator The absolute maximum input voltage is 24V Any higher voltage than this will damage the board within a few seconds The input...

Page 11: ...not source it terminals To connect up you take the positive sides of the LEDs to either VIN or VCC and connect the negative sides of the LEDs to these terminals R PWM cathode connection for the back l...

Page 12: ...Schematic Below is the schematic for the clock...

Page 13: ...Run the two TICK LEDs in series from VIN You don t need a balancing resistor because the LEDs are in series 4 TICK LEDs Run the TICK LEDs by putting 2 in series and running the two series combinations...

Page 14: ...reduce the external voltage from the power adapter down to a known and stable 5V to drive the micro controller and the 74141 K155ID Put the parts on the board in the marked locations in the order the...

Page 15: ...arest the centre of the board This should measure 0 7V less than the input voltage If all is well proceed to the next step If not check carefully the orientation of the components and the power leads...

Page 16: ...At the end of the low voltage circuit build your board should look like this Low Voltage Circuit...

Page 17: ...ion lines up with the white stripe on the board The metal side faces to the outside of the board D2 should be placed so that the white stripe on the body lines up with the white stripe on the board Pu...

Page 18: ...be needing it you can snap the extra pin off and populate only the bottom 3 pins on the connector Test Step Check the voltage at the 170V test point You should read a voltage in excess of 170V You can...

Page 19: ...At the end of the high voltage circuit build your board should look like this High Voltage Circuit...

Page 20: ...the pins on it or wire up the other side with flying wires If you use the side with pins you should carefully remove the two unused pins see hint If you use the contacts on the module you should leave...

Page 21: ...leads you can skip this step and use the four holes on the other side of the board Hint 2N7000 mounting To mount the 2N7000 FET bend the middle lead back slightly It will then fit in the PCB without...

Page 22: ...he rate of the multiplexing and the order in which the anodes are activated Notes The Opto Isolators fit into the 24 pin socket snugly Be careful to put them in the right way round The dot denotes pin...

Page 23: ...cky tape to hold things in place while you solder them This makes is easier to solder and gives a better result Place the components and then temporarily tape them into place After you have installed...

Page 24: ...correct cathodes have to be set Notes Instead of the 74141 you might have the Russian equivalent K155 Be careful to orient the 74141 correctly If you receive the connector header as a single strip bre...

Page 25: ...green is next to the anode and the blue is on the side farthest from the flat The RGB LED anode is connected to pin 4 VCC of SV2 Red is connected to pin 1 of SV6 green to pin 2 of SV6 and blue to pin...

Page 26: ...ed It uses the internal pull up resistor provided by the Atmega on the input pin to pull the input to VCC when the switch is not closed The switch is de bounced in software so practically any switch y...

Page 27: ...are some tricks in the software to make the wiring and the PCB easy and logical We use a translation table in the software and cross some of the standard channels to make the PCB more logical You can...

Page 28: ...e able to switch or disconnect connections Pre cut the wires you are going to use use different colors for each cathode or anode if possible Keep the same color for each cathode as you proceed through...

Page 29: ...connect more tubes and digits There are still a lot of floating connections at this point in the build and we are not loading the HV generator propery Proceed to the other cathodes in turn each time...

Page 30: ...n process we want to loom the wiring This involves binding and or plaiting the wires to make them regular For this you will need to disconnect the wires from the board Make a note of the colors of eac...

Page 31: ...The wiring for the tubes is this Here is a picture of a plaited loom in action This particular version of the clock has two blue tick LEDs in series and three RGB LEDs one for each digit group...

Page 32: ...r has a compatible pin out to the FET drain collector gate base source emitter but can withstand 300V After doing this you can connect one or more neon lamps instead of the LED This gives a more retro...

Page 33: ...alue too high The longer the On Time the more the MOSFET has to conduct current and this will cause it to heat up A good value for small tubes is 120 150 larger tubes may require 150 200 Trouble shoot...

Page 34: ...y reset There is a setting about how hard the IRF740 should be driven PWM On Time Perhaps the value has not been set properly The default value should be OK most of the time but depending on the tubes...

Page 35: ...the controller as you would any other Arduino UNO simply upload the software onto the controller Put the 328P back into the clock board and you are done You can also program the 328P micro controller...

Page 36: ...1 tolerance Alternative 2 The color code for the 10k resistor is BROWN 1 BLACK 0 ORANGE 3 3 zeros in this case GOLD 5 Tolerance 1 0 0 0 0 with 5 tolerance 4 7k resistor Alternative 1 The color code f...

Page 37: ...TE 9 YELLOW 4 4 zeros in this case GOLD 5 Tolerance 3 9 0 0 0 0 with 5 tolerance 2 7k resistor Alternative 1 The color code for the 2 7k resistor is RED 2 VIOLET 7 BLACK 0 BROWN 1 1 zero in this case...

Page 38: ...pF 100 nF 1 nF 1000 pF 22pF capacitor The coding on the 22pF capactor is simply 22 It does not matter which way round it goes RGB LED The RGB LED has one pin longer than the rest This longer pin is t...

Page 39: ...c C7 100nF c R5 2 7k c C8 100nF c R6 2 7k c D2 UF4004 c R15 2 7k c S28 SOCKET 28 c R16 2 7k c Q2 16MHz c R17 2 7k c L1 100uH c SV3 CONN_ANODE c R7 2 7k c Q1 IRF740 c Cathode Control Circuit R9 390k c...

Page 40: ...Sep2015 Updated for board Rev3 V0010b 14Sep2015 Added options and more troubleshooting tips V0010c 01Oct2015 Change GitHub software versioning V0010d 23Oct2015 Move C4 into LV section correct 1uF to 2...

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